NO. 2131. 



NEMATODE PARA.'^rTES OF RODENTS— HALL. 



121 



Tribe uncertain. 

 ANALYTICAL KEY TO UNPLACED SPECIES OF STRONGYLINAE. 



1. Found In inguinal glands ; undescribed Stron(/l!)us Icinmi, p. 122. 



Found in large intestine; described species. 



Strongylus {Deletrocephalus) brachylaimus,]). 121. 



STRONGYLUS (DELETROCEPHALUS) BRACHYLAIMUS von Linstow, igoi. 



Specif e diagnosis. — Deletrocephalus ( ? ) : Cuticle transversely 

 striate at intervals of 21 [x. At the head end is a prominence, smaller 

 in front and broader behind, with a rounded posterior margin. 

 This surrounds a buccal capsule, in the wall of which are about 



Fig. 149.— Strongylus (Deletrocepha- 

 lus) BRACHTLAIMUS. ANTERIOR EX- 

 TREMITY. Enlarged. After von 

 LiNSTOW, 1901. 



Fig. 150.— Strongylus (Deletrocephalus) brach- 

 YLAiMus. Bursa. Enlarged. After von Lin- 

 stow, 1901. 



50 rods, the ends, some of which are cleft, projecting free anteriorly 

 (fig. 119). At the posterior margin of the head prominence and in 

 the four submedian lines are four large papillae, while outside of the 

 buccal capsule four fine clublike papillae project anteriorly. The 

 esophagus is very short. 



3Iale 13 mm. long and 630 [k thick. The esophagus is one-twenty- 

 seventh of the total length. The bursa (fig. 150) has two large 

 lateral lobes and one small median lobe. Of the six rays in the 

 lateral lobes, the ventro-ventral and la tero- ventral are close together 

 and the medio-lateral and postero-lateral are close together. The last 

 two are broad. The medio-lateral and the externo-lateral originate 

 in a common trunk, the externo-lateral branching off and diverging 

 from the medio-lateral, which continues in general the line of the 

 main trunk. The externo-dorsal and the dorsal apparently originate 

 separately. The dorsal trunk divides to form two thick branches, 

 which almost immediately divide to form a short external branch 

 and a longer terminal branch. The very long spicules are 2.9G mm. 

 long. The gubernaculum is 100 pi long. 



Female 20 mm. long and 880 \j. thick. The esophagus is one-thirty- 

 second of the total length. The conical pointed tail is one-ninety- 



