AET. 19 NEMATODES OF GENUS HASTOSPICULUM CHITWOOD 6 



and ventral projections of the " epaulettes," while the four internal 

 submedian papillae are distinctly set off from them. The cuticle is 

 marked in both sexes with coarse elevations or annulations, which do 

 not pass completely around the body but join one another to form a 

 network. Finer intra-annular striations are also present. The annu- 

 lations are most marked in the mid-region of the body, becoming less 

 conspicuous at the posterior end and often disappearing near the 

 head. 



Male, 38 mm. to 55 mm. long and 500/a to 600|U, in maximum di- 

 ameter. The nerve ring surrounds the esophagus 80/x to 100/i, from 

 the anterior end of the body. The anterior muscular portion of the 

 esophagus is 380/x to 420/i, in length and has a maximum diam- 

 eter of 60ju, to 120/x. The posterior portion of the esophagus is 

 7.4 mm. to 8.8 mm. in length and has a maximum diameter of 260jli 

 to 390ya. Testis single, reflexed. Tail surrounded by a bursalike 

 pair of alae supported by five pairs of pedunculate papillae, four 

 pairs of which are preanal and one pair postanal. There are also 

 two pairs of smaller sublatcral papillae slightly anterior to a pair 

 of ventral cone-shaped ones. The latter are situated very slightly 

 anterior to the tip of the tail, which is rounded and does not bear 

 denticles. The left spicule is 1.84 mm. to 2.2 mm. long, its proximal 

 portion being wider {20/x wide) than the distal portion, from which 

 it is set off by a slight twist at a point 400/x to 480ju, from the proxi- 

 mal end; the distal portion is delicately filiform and about 12/1 

 wide, and terminates in an exceedingly fine point. The right spicule 

 is short and curved, 240ju to 280/i long, and about 20/a in maximum 

 width. 



Female, 170 mm. to 350 mm. long and 2.4 mm. to 2.8 mm. in maxi- 

 mum diameter. The nerve ring surrounds the esophagus approxi- 

 mately 280/x from the anterior end of the body. The muscular 

 portion of the esophagus is 600/^ to 650/x long and has a maximum 

 diameter of 120/a to IGO^a. The posterior part of the esophagus is 

 15 mm. to 18 mm. long and oOOfi to 600/4 wide. The anus is appar- 

 ently atrophied. The tail is bluntly rounded. The vulva is located 

 posterior to the base of the muscular portion of the esophagus, 850/i 

 to 1 mm, from the anterior end of the body. Eggs embryonated, 

 spherical, and 44/i to 48/i long by 40/1 to 44/i wide ; shell simple. 



Host. — Coristrictor imperator (Daudin). 



Location. — Under the peritoneal covering of the stomach and 

 intestine. 



Distribution. — National Zoological Park, Washington, D. C. 



Type specimens.— \J. S. N. M. Helm. Coll. No. 30759; paratypes, 

 No. 30740. 



