ART. 17 PARASITES OP AMPHIBIA AND EEPTILIA HARWOOD 55 



Type specimens. — U.S.N.M. Helm. Coll. No. 31706; paratype, No. 

 31707. 



Remarks. — This subspecies is based on two males and three females 

 from G. flagellum and a single male from C. constrictor. The dif- 

 ferences mentioned above are believed to be too great to go unnoticed, 

 and yet they are too variable and too near the type to justify the 

 erection of a new species. 



KALICEPHALUS RECTIPHILUS, new species 



Pi^vTE 5, Figure 2 



Specific diagnosis. — Kalicephalus : A yellowish c^ylindrical worm, 

 with a faintly striated cuticula. The striations are about 2/a apart. 

 A large mouth, of a shape typical for the genus, is separated from 

 the rest of the body by a slight constriction. The esophagus is short, 

 and constricted where the nerve ring encircles it at the level of the 

 union between the first and second thirds. The excretory pore is 

 usually slightly below the widest part of the esophageal bulb. 



Male: Length 5.3 to 5.7 mm, width 0.2 mm. The mouth capsule 

 is 0.17 to 0.18 mm long and 0.18 to 0.2 mm wide. The esophagus is 

 0.22 to 0.23 mm long. The nerve ring and excretory pore are 0.28 

 and 0.33 mm, respectively, from the anterior end. The spicules are 

 0.28 to 0.3 mm long and provided with narrow, transversely striated 

 alae. They are about 10/x wide near the anterior end. There is a 

 well-cutinized gubernaculum, about 0.13 mm long and only about 

 3/x wide in lateral view, with a definite hook present near the anterior 

 end. The bursa is obliquely truncate and, with the exception of the 

 dorsal ray, typical for the genus. The main trunk of the dorsal ray 

 is very short. It bifurcates immediately alter the separation of the 

 \xterno-dorsal rays, and almost at once the two branches again 

 bifurcate. The inner rays are again bifid near the tip. The pattern 

 of the dorsal ray is, therefore, very similar to that of DiapJmnocepha- 

 lus galeatus. 



Female: Body length 6.9 to 7.7 mm; maximum width 0.22 to 0.26 

 mm. The mouth capsule is 0.2 to 0.22 mm long and 0.22 to 0.24 

 mm wide. The esophagus is 0.25 to 0.28 mm long. The nerve ring 

 and excretory pore are 0.28 to 0.3 and 0.36 to 0.4 mm, respectively, 

 from the anterior end. The vulva is 4 to 4.3 mm from the anterior 

 end and divides the body in the proportions of 1.2 to 1.4 : 1. The 

 ovejectors and uteri are divergent. The eggs measure 63/x to 71/x 

 by 18/x to 22;a. They are in a very early stage of development when 

 deposited. The female tail is 0.25 to 0.38 mm long and ends very 

 bluntly. 



Host. — Coluber constrictor f.aviventris. 



Habitat. — Rectum. 



