Part 12

Spindalis zena benedicti Ridgway: Stripe-headed Tanager.--Two males in advanced molt but with enlarged gonads were taken on August 9 and 10 and seem to be the first records indicating breeding in this species on Isla Cozumel.

Specimens (3): , 40878, testis 9 × 7 mm., 32 gm., molting--5th primaries and middle pair of rectrices ensheathed (August 9), , 40880, testis 5 × 3 mm., 30.0 gm., molting--3rd, 4th, 5th primaries and middle two pairs of restrices ensheathed (August 10), and [Female], 40879, ovary inactive, 28.1 gm., molting--remiges are new; secondary coverts ensheathed (August 10), 3-1/2 km. N San Miguel, Isla Cozumel.

Piranga roseogularis (Cabot): Rose-throated Tanager.--Breeding has been previously recorded from March 17 through May 11 (Paynter, 1955a:276). Our only specimen, a male in advanced molt, had enlarged (regressing) testes.

Specimen (1): , 40881, testis 7 × 5 mm., 24.2 gm., molting--4th and 5th primaries ensheathed (August 15), 4 km. NNE Felipe Carrillo Puerto.

Habia gutturalis (Sclater): Red-throated Ant-tanager.--The only breeding records previously available for this species on the peninsula are for May 18 (Paynter, 1955a:280) and June 25 (Paynter, 1955b). Specimens taken between July 14 and August 2 were in full breeding condition. A male (40882) and female (40883) taken 7-1/2 km. W Escárcega were known to be mated. Plumages in all specimens are worn and for that reason specimens were not identified to subspecies.

Specimens (6): , 40882, testis 14 × 9 mm., 38.9 gm. (July 14), [Female], 40883, ovary 5 × 5 mm., 29.0 gm. (July 14), and , 40887, testis 10 × 7 mm. (July 16), 7-1/2 km. W Escárcega; , 40885, juv. (rectrices and remiges ensheathed basally) (July 28), and [Female], 40886, ovary moderately active, 30.5 gm., molting--2nd primaries ensheathed (July 28), Pueblo Nuevo X-can; , 40884, testis 15 × 8 mm. (August 2), 4 km. WSW Puerto Juarez.

Saltator atriceps (Lesson): Black-headed Saltator.--Previously, breeding has been noted in this species in February, March, and April (Paynter, 1955a:284). A male taken on July 16 was in full breeding condition.

Specimens (3): , 40895, testis 15 × 9 mm., 80.4 gm. (July 16), and [Female], 40896, 73.5 gm. (July 17), 7-1/2 km. W Escárcega; , 40894, 71.6 gm. (July 29), Pueblo Nuevo X-can.

Saltator coerulescens (Vieillot): Gray Saltator.--The only previous breeding record for this species is for April 26. Our one specimen, No. 40897, a juvenal male barely able to fly, taken on July 21 at Pisté, weighed 43.8 grams.

Richmondena cardinalis (Linnaeus): Cardinal.--The only record of breeding previously reported is of a male with enlarged testes taken on June 4 (Paynter, 1955a:287). Adult males with enlarged testes were obtained on July 11 and August 10, and three juveniles were taken southwest of Sisal on August 10, 16, and 18.

Specimens (7): , 40903, testis 9 × 7 mm., 39.7 gm. (July 11), and [Female], 40904, 34.0 gm. (July 11), 5 km. S Champotón; , 40898, testis 7 × 4 mm., 33.8 gm. (August 10), and [Female], 40899, juv. (rectrices and remiges ensheathed basally), 32.8 gm. (August 10), 13 km. WSW Sisal; , 40900, fledgling, 18.4 gm. (August 18), 2 km. WSW Sisal; [Female], 40901, ovary granular, 37.4 gm., molting--1st primaries ensheathed (August 15), and , 40902, imm., 34.0 gm. (August 16), 4 km. NNE Felipe Carrillo Puerto.

Cyanocompsa parellina (Bonaparte): Blue Bunting.--Specimens (2): , 40906, imm. (July 15), and , 40905, testis 10 × 7 mm., 15.2 mm. (July 15), 7-1/2 km. W Escárcega.

Tiaris olivacea pusilla (Swainson): Yellow-faced Grassquit.--The only records of breeding, thus far, are by Paynter (1955a:291) for March 12 and June 14. A male (40907) taken 4 km. NNE Felipe Carrillo Puerto on August 14 had fully enlarged testes (8 × 5 mm.).

Tiaris olivacea intermedia (Ridgway): Yellow-faced Grassquit.--Although females taken on Isla Cozumel exhibited no reproductive activity, two males had moderately enlarged testes. These seem to be the first records of breeding in this subspecies, which is endemic to Isla Cozumel.

Specimens (5): , 40908, testis 6 z 4 mm., 10.5 gm. (August 8), [Female], 40912, ovary inactive, 9.5 gm. (August 8), [Female], 40909, ovary inactive, 10.4 gm. (August 9), , 40910, testis 5 × 3 mm., 11.5 gm., molting--1st primaries ensheathed (August 9), and , 40911, 11.5 gm. (August 10), all from {2-1/2}-{3-1/2} km. N San Miguel, Isla Cozumel.

Sporophila torquiola morelleti (Bonaparte): White-collared Seedeater. --Breeding is known for this species in May and a male collected on September 2 was in breeding condition (Paynter, 1955a:293). Our records seem to be the first for the summer. Specimens taken in July and August were breeding.

Specimens (7): [Female], 40918, 9.2 gm. (July 8), 1 km. SW Puerto Real, Isla del Carmen; , 40919, testis 7 × 6 mm., 8.2 gm. (July 15), 7-1/2 km. W Escárcega; [Female], 40913, ovary inactive, 7.9 gm. (August 4), 4 km. WSW Puerto Juarez; , 40914, testis minute, 7.8 gm. (August 14), [Female], 40915, ova to 6 mm. (August 15), [Female], 40917, ovary moderately active, 7.0 gm. (August 16), and , 40916, testis 7 × 5 mm., 7.6 gm. (August 16), 4 km. NNE Felipe Carrillo Puerto.

Volatinia jacarina splendens (Vieillot): Blue-black Grassquit.--The only previous record of breeding is a male having slightly enlarged testes taken on June 1 (Paynter, 1955a:293). Our specimens showed various stages of reproductive activity when taken on July 10.

Specimens (6): , 40926, 8.9 gm. (July 10), and , 40925, testis 2 × 1 mm., 8.5 gm. (July 10), 1 km. S Puerto Real, Isla del Carmen; , 40924, testis 4 × 2 mm. (July 10), , 40922, testis 6 × 4 mm., 8.3 gm. (July 10), [Female], 40923, ova to 2 mm., 10.3 gm. (July 10), and , 40921, 8.2 gm. (July 10), 5 km. S Champotón.

Arremonops rufivirgata verticalis Ridgway: Olive Sparrow.--Apparently the only previous record of breeding was the laying female on June 14 reported by Paynter (1955a: 294). Males collected in July and August had enlarged testes; a juvenile, barely able to fly, was taken on August 14. Two specimens were beginning to molt.

Specimens (9): [Female], 40932, ova to 1 mm., 20.8 gm. (July 21), and , 40933, testis 8 × 6 mm., 21.2 gm. (July 21), Pisté; [Female], 40930, ovary moderately active, 23.2 gm. (July 26), and , 40931, imm., 22.7 gm. (July 26), 3-1/2 km. N Pisté; , 40934, testis 6 × 4 mm., 24.5 gm., molting--1st and 2nd primaries ensheathed (August 14), , 40935, juv. (remiges and rectrices ensheathed basally), 17.7 gm. (August 14), [Female], 40936, imm., 25.0 gm (August 14), [Female], 40937, ovary granular, 22.6 gm., molting--2nd primaries ensheathed (August 15), and , 40938, testis 7 × 5 mm. (August 15), 4 km. NNE Felipe Carrillo Puerto.

Arremonops chloronota chloronota (Salvin): Green-backed Sparrow.-- Evidence presented by Monroe (1963) indicates that A. chloronota and A. conirostris are not conspecific. Specimens collected in breeding condition in July seem to be the first breeding records of this species on the peninsula.

Specimens (7): [Female], 40942, ova to 3 mm., 29.6 gm. (July 11), 5 km. S Champotón; , 40944, testis 10 × 6 mm., 27.0 gm. (July 14), , 40943, testis 5 × 3 mm., 23.1 gm. (July 14), and , 40945, testis 7 × 4 mm., 25.5 gm. (July 15), 5-{7-1/2} km. W Escárcega; sex? 40939, 22.9 gm. (July 20), 6-1/2 km. W Pisté; , 40940, imm., 21.5 gm. (August 4), 4 km. WSW Puerto Juarez; [Female], 40941, 26.5 gm., extensive body molt, (August 15), 4 km. NNE Felipe Carrillo Puerto.

TABLE 2. An Alphabetical List of Species of Mallophaga Removed from Birds Collected on the Yucatán Peninsula in 1962.

======================================================================== | |KU Catalogue MALLOPHAGA | Hosts |Nos. of | |specimens | | of hosts ------------------------------------------------------------------------ Actornithophilus ochraceus |Snowy Plover |40426, 40431 Amyrisidea spicula |Chachalaca |Specimen not | |preserved Austromenopon sachlebeni |Willet. |40441 Carduiceps zonarius |Sanderling |40443, 40444 Ciconiphilus obscurus |American Egret |40402 Colpocephalum foetens |Black Vulture |Specimen not | |preserved Colpocephalum megalops |King Vulture |40403 Columbicola macrourae |Zenaida Dove |40399 Columbicola sp. |Red-billed Pigeon |40457 Craspedorrhy sp. |Gray Hawk |40415 Lunaceps holophaeus actophilus |Sanderling |40444 Myrsidea sp. |Tropical Mockingbird |40771 Myrsidea sp. |Cave Swallow |40690, 40704 Myrsidea sp. |Sulphury Flat-billed | | Flycatcher |40685 Philopterus excisus |Cave Swallow |40697 Philopterus sp. |Sulphury Flat-billed | | Flycatcher |40682, 40686 Philopterus sp. |Great Kiskadee |40664 Philopterus sp. |Turquoise-browed Motmot |Specimen not | |preserved Philopterus sp. |Yellow-green Vireo |40804 Penerirmus sp. |Red-capped Green | | Woodpecker |40594 Quadraceps assimilis major |Snowy Plover |40431 Quadraceps assimilis major |Wilson Plover |40432, 40436 Quadraceps carrikeri |Willet |40442 Quadraceps ravus |Spotted Sandpiper |40438 Quadraceps sp. |Laughing Gull |40449 Saemundssonia brevicornis |Cabot Tern |40452

SUMMARY

Locality records are given for each of 136 species of birds represented by 493 specimens and sight records are given for eight additional species.

The Yellow-headed Vulture is reported apparently for the first time from the peninsula. The specimens of the Streak-headed Woodhewer and the Louisiana Waterthrush are the second ones of each species taken on the peninsula. The Purple Martin taken on August 14, the Barn Swallow on August 18, and the Louisiana Waterthrush on August 14 represent earliest known autumn dates for these transients.