NEMATODE PARASITES OF BIRDS 323 



Hosts. — Primary: Momotus brasiliensis (=Mo?notus momota) 

 and Icterus croconotus; secondary : Unknown. 



Location.. — Under nictitating membrane. 



Morphology. — Oxyspirura (p. 321) : Body gradually attenuated 

 anteriorly, with rounded apex. Tail awl-shaped, drawn out into a 

 slender acute point. Cuticula with dense transverse striations. Head 

 (fig. 386 a) with membranous alae dilated and rounded anteriorly. 

 Mouth hexagonal, without lips, surrounded by a membranous border; 

 2 lateral and 4 submedian cephalic papillae. 



Male 13 to 15 mm. long by 200/x, wide. Tail (fig. 386 b) coiled in 

 2 turns. Caudal alae absent. Seven pairs of preanal and 6 pairs 

 of postanal papillae, the latter more or less inconstant and asym- 

 metrical. Spicules unequal, the right short, thick, navicular, with 

 blunt rounded tip, the left filiform, pointed, alate, five times as long 

 as the right. 



Female 10 to 13 mm. long by 300/x wide. Anus remote from end 

 of tail. Position of vulva not determined. 



Life history. — Unknown ; probably involves intermediate stages in 

 other hosts. 



Distribution. — South America (Brazil). 



OXYSPIRURA ANACANTHURA (Molin, 1S60) Stossich, 1897 



Synonyms. — Spiroptera anacanthura Molin, 1860; Spiroptera 

 crotoph-agae ani Molin, 1860; Spiroptera crotop/iagae majoris Molin, 

 1860. 



Hosts. — Primary : Crotophaga ani, C. major; secondary : Unknown. 



Location. — Under nictitating membrane. 



Morphology. — Oxyspirura (p. 321) : Body straight and slender, 

 sharply pointed posteriorly. Head with 2 voluminous lateral cuti- 

 cular membranes (Molin described 4 membranes, but Drasche, re- 

 examining the same material, found only 2). Mouth large, circular, 

 gradually attenuated toward both ends, truncated anteriorly and 

 surrounded by 6 small membranous lobules and 4 submedian papillae. 

 Buccal cavity or pharynx short. Cuticula with fine transverse 

 striations. 



Mule 8 to 10 mm. long by 100^ wide. Caudal end (fig. 387«) coded 

 in a single turn and without alae. Two pairs of preanal papillae and 

 a variable number, up to 5 pairs of postanal papillae, asymmetrically 

 arranged. Two unequal spicules, the right (fig. 387 6) one short, 

 thick, with boat-shaped distal end, the left one slender, sharply 

 pointed, alate, and five times as long as the right spicule. 



Female 11 to 13 mm. long by 200 fi wide. Vulva prominent, a short 

 distance anterior to anus. 



