Part 8

Xiphorhynchus flavigaster (Swainson): Ivory-billed Woodcreeper.-- According to Paynter (1955a:173), indications of breeding have been observed in specimens of this species taken between March 27 and June 5. A male taken on August 15 had moderately enlarged (probably regressing) testes and was well into the molt.

Specimen (1): , 40619, testis 5 × 3 mm., 51.5 gm., molting--5th primaries and middle pair of rectrices ensheathed (August 15), 4 km. NNE Felipe Carrillo Puerto.

Lepidocolaptes souleyetii (Des Murs): Streak-headed Woodhewer.--This appears to be the second specimen recorded from the peninsula (see Traylor, 1941).

Specimen (1): , 40621, testis 3 × 1 mm., 26.6 gm., molting--6th primaries ensheathed, middle pair of rectrices are new (July 17), 1 km. N, 13 km. W Escárcega.

Synallaxis erythrothorax Sclater: Rufous-breasted Spinetail.--Specimen (1): , 40622, imm. skull, 16.1 gm. (August 16), 4 km. NNE Felipe Carrillo Puerto.

Thamnophilus doliatus (Linnaeus): Barred Antshrike.--Specimen (1): [Female], 40623, ovary 8 × 5 mm. (inactive), 26 gm. (August 14), 4 km. NNE Felipe Carrillo Puerto.

Formicarius analis (d'Orbigny and Lafresnaye): Black-chinned Antthrush.--Specimen (1): , 40624, 56.0 gm. (July 29), Pueblo Nuevo X-can.

Pachyramphus major itzensis Nelson: Mexican Becard.--Previous records of breeding in this species are provided by a female obtained on July 12 (Paynter, 1955a:182) and a male taken on June 9 (Paynter, 1955b).

Specimen (1): , 40625, testis 9 × 5 mm., 22.1 gm. (July 21), Pisté.

Platypsaris aglaiae (Lafresnaye): Rose-throated Becard.--All specimens have extensively worn plumage.

Specimens (3): , 40628, 33.5 gm. (July 10), 5 km. S Champotón; [Female], 40626, ovary 6 × 3 mm., brood patch, 34.0 gm. (July 20), [Female], 40627, ovary inactive, 33.9 gm. (July 26); 3-1/2 km. N and 6-1/2 km. W Pisté.

Tityra semifasciata personata Jardine and Selby: Masked Tityra.-- Previously, breeding information for this species has been available only for March (Paynter, 1955a:184). Adults were observed feeding young fledglings 7-1/2 km. W Escárcega on July 15, and a juvenile was taken. Gonads of males were in full breeding condition.

Specimens (5): , 40630, testis 13 × 6 mm., 81.3 gm. (July 14), sex? 40631, juv., 55.5 gm. (July 15), , 40632, testis 9 × 5 mm., 73 gm., molting--1st and 2nd primaries ensheathed (July 15), and [Female], 40633, 84.7 gm. (July 16), 7-1/2 km. W Escárcega; [Female], 40629, ova to 1 mm., 80.0 gm. (July 23), Pisté.

Erator inquisitor fraserii (Kaup): Black-capped Tityra.--Breeding has been recorded by Paynter (1955a:185) on April 26. A moderately enlarged testis (probably regressing) was noted in the specimen from Pisté, on July 21.

Specimens (2): [Female], 40635, 51.8 gm. (July 15), 7-1/2 km. W Escárcega; , 40634, testis 6 mm., 51 gm., molting--6th primaries ensheathed (July 21), Pisté.

Pipra mentalis mentalis Sclater: Red-capped Manakin.--The specimens here reported seem to be the first from the peninsula in which reproductive activity has been recorded.

Specimens (2): , 40637, testis 5 × 3 mm., 14.0 gm. (July 29), Pueblo Nuevo X-can; , 40636, testis 5 × 2 mm., 14.6 gm. (August 3), 4 km. WSW Puerto Juarez.

Pyrocephalus rubinus (Boddaert): Vermillion Flycatcher.--This species was seen only in the arid scrub 2-13 km. WSW of Sisal. Breeding seemingly had ended by early August, as evidenced by four adults that showed no gonadal activity and were in advanced stages of molt.

Specimens (5): [Female], 40638, juv., 12.1 gm. (August 7), 1-1/2 mi. S Sisal; [Female], 40640, ovary inactive, 14.1 gm., molting--6th primaries ensheathed (August 10), [Female], 40641, ovary inactive, 13.9 gm., molting--7th primaries ensheathed (August 10), and , 40642, testis 2 mm., 14.6 gm., molting--5th primaries ensheathed (August 10), 13 km. WSW Sisal; [Female], 40639, testis 1 mm., 14.0 gm., molting--7th primaries ensheathed (August 18), 2 km. SW Sisal.

Tyrannus melancholicus chloronotus Berlepsch: Tropical Kingbird.--Most specimens were molting. A male and two females from Pisté taken on July 21 and a female from Pueblo Nuevo X-can (July 29) had slightly enlarged (probably regressing) gonads. Three immatures were collected and adults were seen feeding young fledglings at Pisté. There seems to be no other breeding records from the peninsula.

Specimens (10): [Female], 40650, 42 gm., (July 10), 5 km. S Champotón; [Female], 40752, ovary inactive, 43.4 gm., molting--4th primaries ensheathed (July 14), and , 40651, imm., 42.5 gm. (July 15), 6-7-1/2/# km. W Escárcega; [Female], 40645, ovary slightly enlarged (8 × 3 mm.), 47.5 gm. (July 21), [Female], 40643, ova to 1 mm., 39.3 gm. (July 21), , 40644, testis 10 × 7 mm., 43.1 gm., starting to molt--1st primaries ensheathed (July 21), and [Female], 40646, imm., (July 26), Pisté; [Female], 40648, ova to 1 mm., 37.4 gm. (July 29), Pueblo Nuevo X-can; , 40647, imm., 38.4 gm. (August 14), and [Female], 40649, 44.4 gm., molting--only outer 3 pairs of rectrices present and are ensheathed basally, 6th and 7th primaries ensheathed (August 15), 4 km. NNE Felipe Carrillo Puerto.

Myiodynastes luteiventris luteiventris Sclater: Sulfur-bellied Flycatcher.--The latest breeding record given by Paynter (1955a:191) is for the last week in June. A male taken on July 31 had enlarged testes. None of the following specimens was in the process of molt.

Specimens (4): [Female], 40655, 44.5 gm. (July 10), 5 km. S Champotón; [Female], 40656, ovary slightly enlarged (8 × 4 mm.), 47.0 gm. (July 15), 7-1/2 km. W Escárcega; [Female], 40654, testis 10 × 4 mm., 39 gm. (July 31), Pueblo Nuevo X-can.

Megarhynchus pitangua mexicanus (Lafresnaye): Boat-billed Flycatcher.--I know of no previous breeding record for this species on the peninsula. The female obtained on July 25 was observed feeding young.

Specimens (2): [Female], 40658, 57.6 gm. (July 11), 5 km. S Champotón; [Female], 40657, ovary 10 × 5 mm., 59.8 gm. (July 25), Cenote Seco, 2 km. E Chichén-Itzá.

Myiozetetes similis texensis (Giraud): Vermilion-crowned Flycatcher. --Paynter (1955a:192) reported this species breeding in mid-May. A male taken on July 17 west of Escárcega had enlarged (probably regressing) testes and indicates breeding later than May.

Specimens (3): , 40660, testis 6 × 3 mm., 32.0 gm. (July 17), and sex? 40661, 33.8 gm., molting--5th primaries ensheathed (July 17), 1 km. N, 13 km. W Escárcega; , 40659, imm., testis 2 × 1 mm., 27.6 gm. (July 29), Pueblo Nuevo X-can.

Pitangus sulphuratus guatimalensis (Lafresnaye): Great Kiskadee.-- Apparently our specimens, which were in the late stages of breeding, are the first evidence of reproduction for the species on the peninsula.