16 BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



300/* long. Posterior uterus smaller than anterior. Eggs 59 to 74/* 

 by 36 to 44/*. 



Life history. — Eggs segmenting in ovejectors; in morula stage in 

 fresh feces. Under favorable conditions eggs hatch in 59 to 98 hours. 

 First-stage larva 240 to 750/* long by 18 to 28/* wide; rhabditiform 

 and with a tapering tail continued in a thin cylindrical appendage 

 bearing a small knob at its tip. Molting under favorable conditions 

 occurs in 50 hours; the second-stage larva 600 to 900/* long, with a 

 tail longer and finer than in preceding and with rounded tip. Molt- 

 ing under favorable conditions occurs in 60 hours; the third-stage 

 larva is ensheathed at first and has a small spined knob on the end 

 of the tail; with the old cuticle the larva averages 745/* long and 

 without it 530/* long. Molting occurs in the host in 4 to 5 days ; tl 

 fourth-stage larva gradually developing to an adult under its cuticle, 

 with evident sex differences in the larvae. Molting to adults occurs 

 in about 3 weeks. Eggs are present in the ovejectors in 33 days. 

 This life history was ascertained by Theiler and Robertson. 



Distribution. — South Africa. 



ORNITHOSTRONGYLUS PAPILLATUS (Linstow, 1882) Travassos. 1920a 



Synonym. — Strongylus papillatus Linstow, 1882. 



Host. — Otis tarda. 



Location. — Intestine. 



Morphology. — Ornithostrongylus (p. 11) : Small and delicate 

 forms, transversely striated, especially at cephalic extremity. Cervi- 

 cal papillae present a short distance from the head end and very 

 small. 



Male 6.7 mm. long by 72/*. wide, attenuating anteriorly. Esophagus 

 1/9 of body length or 740/* long. Spicules 140//, long, thick and with 

 2 spines in the anterior third. Telamon fusiform, 72/* long. Bursa 

 (fig. 11) with 2 large lateral lobes and a small median lobe. Lateral 

 rays and latero-ventral ray form a symmetrical group apart from 

 the ventro-ventral and the externo-dorsal ; the extremities of the rays 

 are curved. Two dorsal rays originate with their respective externo- 

 dorsal and converge to meet and fuse at their tips where they form 

 a bifid termination; previous to the fusion they each give off an 

 external branch. Prebursal papillae present. (If the structure of 

 this dorsal ray is correctty described and figured, it raises a doubt as 

 to whether this species should be included in Ornithostrongylus.) 



Female 8.4 mm. long by 84/* wide. Esophagus 1/11 of body length 

 or 760/* long. Vulva in posterior body, dividing body in ratio of 

 41 : 7, or about 1.45 mm. from tail end. Eggs colorless, 80/* by 36/*. 



Life history. — Unknown; probably simple and direct. 



Distribution . — Europe. 



