Part 9

Specimens (4): [Female], 40663, ova to 1 mm., 50.7 gm. (July 9), and , 40664, right testis 12 mm., 65.0 gm., body feathers in early stages of molt (July 9), 5 km. S Champotón; , 40665, testis 5 mm., 61.9 gm., molting--middle pair of rectrices are new, 6th primaries ensheathed (July 15), 7-1/2 km. W Escárcega; sex? 40662, 59.5 gm. (August 14), 4 km. NNE Felipe Carrillo Puerto. Mallophaga: Philopterus sp.

Myiarchus tyrannulus cooperi Baird: Wied Flycatcher.--This species was especially common among the coco palms on Isla del Carmen and Isla Cozumel.

Specimens (5): , 40667, 36.7 gm. (July 8), , 40668, 36.6 gm. (July 8), sex? 40669, 39.4 gm. (July 8), and [Female], 40670, 37.3 gm. (July 8), all from 1 km. SW Puerto Real, Isla del Carmen; [Female], 40666, ovary inactive, 34.9 gm. (August 10), 3 km. N San Miguel, Isla Cozumel.

Myiarchus tuberculifer platyrhynchus Ridgway: Olivaceous Flycatcher. --Breeding specimens of this species have been known previously from April and May (Paynter, 1955a:196); records listed beyond extend the season nearly three months.

Specimens (7): [Female], 40673, ova to 5 mm. (July 10), and [Female], 40674, ovary 7 × 3 mm. (ova to 1 mm.) (July 11), 5 km. SW Champotón; [Female], 40745, ovary inactive, 17.5 gm., starting to molt--1st, 2nd, and 3rd primaries ensheathed (July 16), 7-1/2 km. W Escárcega; [Female], 40671, imm., 16.1 gm. (July 20) Cenote Seco, 2 km. E Chichén-Itzá; , 40746, 18.2 gm. (July 22), Pisté; [Female], 40672, ovary inactive, 17.7 gm., molting--5th and 6th primaries and 1st secondaries ensheathed (August 15), 4 km. NNE Felipe Carrillo Puerto; , 40675, left testis 13 mm., right testis 10 mm., 17.5 gm. (August 8), 3-1/2 km. N San Miguel, Isla Cozumel.

Contopus cinereus (Spix): Tropical Pewee.--The regressing gonads of the male taken on July 21 in an early stage of molt suggests breeding on the peninsula.

Specimens (2): , 40676 testis 6 × 3 mm., 11.5 gm., starting to molt--1st and 2nd primaries ensheathed (July 21), 6-1/2 km. W Pisté; , 40677, testis 1 mm., 12.6 mm., molting--4th, 5th, and 6th primaries and 2nd secondaries ensheathed (August 14), 4 km. NNE Felipe Carrillo Puerto.

Tolmomyias sulphurescens (Spix): Sulphury Flat-Billed Flycatcher.-- Paynter (1955a:201) presented breeding records for this species from mid-April to late June. My specimens seem to indicate that breeding extends at least into July.

Specimens (6): [Female], 40683, juv., 14.0 gm. (July 21), , 40684, juv. (remiges and rectrices ensheathed basally), 14.0 gm. (July 21), and , 40682, testis 8 × 4 mm., 13.7 gm. (July 26), Pisté and 3-1/2 km. N Pisté; , 40685, testis 7 × 4 mm., 15.3 gm., molting--1st and 2nd primaries ensheathed (July 28), and [Female], 40686, ovary inactive (July 28), Pueblo Nuevo X-can; , 40687, imm., 16.0 gm. (August 15), 4 km. NNE Felipe Carrillo Puerto. Mallophaga: Philopterus sp. July 28; Myrsidea sp. July 28.

Myiopagis veridicata (Vieillot): Yellow-crowned Elaenia.--The only previous breeding record is of a male that was taken on April 29. My only specimen has nearly fully enlarged testes.

Specimen (1): , 40688, testis 7 × 4 mm., 13.1 gm. (July 17), 1 km. N, 13 km. W Escárcega.

Progne subis subis (Linnaeus): Purple Martin.--A large migrant flock of several thousand individuals of this species was present for several days in August at Rancho San Miguel.

Specimens (3): [Female], 40723, ovary inactive, 48.6 gm. (August 14), [Female], 40724, 51.8 gm. (August 17), and [Female], 40725, imm. skull, 52.1 gm. (August 17), 4 km. NNE Felipe Carrillo Puerto.

Petrochelidon fulva citata Van Tyne: Cave Swallow.--Throughout our stay at Pisté, large numbers of Cave Swallows were seen flying in and out of the small opening of a well-like cenote in the center of the village. Specimens were easily collected in a mist net placed across the opening. No young Cave Swallows were taken and gonads of adults were in various stages of reproductive activity. A few individuals taken were beginning to molt. Probably the swallows were nesting in the cenote although the nests were inaccessible to view. Previous breeding records are for April (Paynter, 1955a:209).

Twenty-two specimens were collected, of which the following were taken at Pisté, July 21-25: , 40693, testis 6 × 3 mm., 18.4 gm.; , 40696, 16.4 gm.; [Female], 40697, 18.2 gm.; , 40695, 15.0 gm.; [Female], 40690, ovary inactive, 18.4 gm., molting--2nd primaries ensheathed; , 40692, testis 5 × 3 mm., 17.9 gm.; [Female], 40698, 18.3 gm.; [Female], 40702, ovary 7 × 3 mm., 18.9 gm.; [Female], 40703, ovary 6 × 3 mm., 17.5 gm.; , 40713, testis 3 mm., 18.4 gm.; [Female], 40704, 16.5 gm.; , 40705, 20.3 gm.; , 40699, testis 2 mm., 18.6 gm., molting--2nd primaries ensheathed; [Female], 40700, ovary 5 × 3 mm., 18.5 gm., molting--1st primaries ensheathed; [Female], 40701, ovary 5 × 3 mm., 16.5 gm., molting--1st primaries ensheathed; , 40707, testis 7 × 5 mm., 19.9; , 40708, testis 4 × 3 mm., 18.4 gm.; [Female], 40709, ovary 4 × 3 mm., 18.0 gm.; sex? 40711, 18.3 gm., molting--1st and 2nd primaries ensheathed.

Additional specimens are: [Female], 40718, 16.5 gm., molting--3rd primaries ensheathed (August 16), and [Female], 40719, 18.5 gm., molting 1st primaries ensheathed (August 16), 4 km. NNE Felipe Carrillo Puerto; , 40689, testis 1 mm., 16.2 gm., molting--2nd primaries ensheathed (August 10), 13 km. WSW Sisal. Mallophaga: Philopterus excisus, July 21; Myrsidea sp. July 21 and 25.

Stelgidopteryx ruficollis Audubon: Rough-winged Swallow.--Previous records indicate that three subspecies of this species occur on the Yucatán Peninsula (Paynter, 1955a:209). One of these, S. r. ridgwayi, is resident. S. r. serripennis, representing the breeding population occurring from British Columbia and New Hampshire over much of the United States to central California, central Texas, and the Gulf states, has been taken on the peninsula in winter. Paynter referred two specimens taken in late September and three January-taken specimens to S. r. stuarti, the highland race that breeds from the mountains of southern Veracruz to Guatamala.

Allan R. Phillips had identified two immature individuals (40694 and 40712) from Pisté as S. r. stuarti; one specimen from Puerto Juarez also is an immature and is nearly identical to those from Pisté. Two adults from Pisté (40691 and 40710) are noticeably darker dorsally than the immatures but are molting extensively and their identification to subspecies is equivocal. Two other adults (40706 and 40715) were prepared as skeletons.

Although mid-July seems early for S. r. stuarti to be present on the peninsula it is not too surprising since the three specimens positively identified are immature birds and young possibly arrive earlier than do adults. But, the immature specimens possibly are atypical individuals of the resident population of S. r. ridgwayi.

Except for the immature individual from 5 km. WSW Puerto Juarez, all specimens were taken in mist nets over the cenote at Pisté where Petrochelidon fulva also was obtained.

Specimens (7): , 40694, imm., 16.2 gm., [Female], 40691, ovary inactive, 16.4 gm., molting--general body molt, 5th primaries and middle pair of rectrices ensheathed, [Female], 40712, imm., 14.5 gm., [Female], 40706, 14.8 gm., , 40715, 16.4 gm., , 40710, 18.5 gm., molting--general body molt, 1st primaries and middle pair of rectrices ensheathed, all from Pisté, July 21 and 25; , 40720, imm., 15.5 gm. (August 1), 5 km. WSW Puerto Juarez.

Hirundo rustica erythrogaster Boddaert: Barn Swallow.--Specimen (1): [Female], 40721, imm., 7.3 gm. (August 18), apparently an early migrant, 2 km. WSW Sisal.

Iridoprocne albilinea (Lawrence): Mangrove Swallow.--Specimen (1): [Female], 40722, imm. (July 7), Puerto Real, Isla del Carmen.

Cissilopha yucatanica (Dubois): Yucatán Jay.--Heretofore, breeding activity has been recorded only in March (Paynter, 1955a:217). All specimens in my collection have extensively worn plumage and were beginning to molt.

Specimens (6): , 40726, left testis 9 × 7 mm., right testis 4 × 2 mm., brood patch, 122.3 gm., molting--1st and 2nd primaries ensheathed (July 10), 5 km. S Champotón; , 40727, testis 5 × 3 mm., brood patch, 125.6 gm., molting--1st and 2nd primaries ensheathed (July 11), 5 km. SW Champotón; [Female], 40728, 109.8 gm. (July 13), and sex? 40729, 109.5 gm. (July 15), 7-1/2 km. W Escárcega; [Female], 40730, imm., 110.3 gm. (July 21), Pisté; [Female], 40731, ovary inactive, brood patch refeathering, 121 gm., molting--2nd and 3rd primaries ensheathed (August 16), 4 km. NNE Felipe Carrillo Puerto.

Cyanocorax yncas maya (van Rossem): Green Jay.--There are records of breeding by this species on the peninsula for April 28 and 29, and June 4 (Paynter, 1955a:215, 216).

Specimens (4): , 40740, testis 5 × 3 mm., 81.2 gm. (July 16), 7-1/2 km. W Escárcega; [Female], 40739, juv., 62.3 gm. (July 21), , 40737, 64.5 gm. (July 21), and [Female], 40738, 64.1 gm. (July 21), Pisté.

Psilorhinus morio (Wagler): Brown Jay.--Specimens (3): [Female], 40742, 203.5 gm. (July 13), , 40743, juv., 170 gm. (July 14), 7-1/2 km. W Escárcega; , 40741, juv., 193.7 gm. (August 14), 4 km. NNE Felipe Carrillo Puerto.