186 



BULLETIN 140, UNITED STATES NATIONAL MUSEUM 



namely the relative length of spicules, the longer spicule in H. uni- 

 lateralis being only 2% times the length of the shorter, in their speci- 

 mens over 3 times as long; the 2 pairs of postanal papillae situated 

 between the cloacal aperture and the terminal group of small papillae 

 are long pedunculated papillae in H. unilateralism whereas they are 

 sessile papillae in the specimens of Gendre and Seurat. It is there- 

 fore thought advisable by the present writer to keep as a distinct 

 species the form from Neophron, species. 



HABRONEMA UNILATERALIS (Molin, 1860) Seurat, 1914f 



Synonyms. — Spiroptera unilateralis Molin, 1860&/ Spiroptera 

 unialata Molin, 1860. 



Morphology. — Habronema (p. 172) : Body slender anteriorly, 

 rhynchus and R. mtellinus; secondary : Unknown. 



Location. — Esophagus and "ventriculus" (gizzard or proventri- 

 culus ? ) . 



Fig. 256, 



-Habronema unilateralis. a, Head, front view ; b, male tail. 

 Drasche, 1884 



Morphology. — Habronema (p. 172) : Head continuous with body; 

 anterior extremity noticeably attenuated, posterior of increased size. 

 Cuticle transversely striated. Mouth (fig. 256a) with 2 lateral lips, 

 the median edge notched; each lip with a large lobe and 3 papillae. 

 Dorsal and ventral lips tooth-like. Four large submedian papillae. 

 Body with one lateral ala, moderately wide. 



Male 7 to 9 mm. long by 20(V wide. Caudal extremity (fig. 2566) 

 semispiral; caudal alae moderately wide. Tail with 6 pairs of long 

 pedunculated papillae, of which 4 pairs are preanal and 2 pairs post- 

 anal; in addition a terminal group of 3 or 4 pairs of small ses?ile 

 papillae and an unpaired papilla directly anterior to the cloacal 

 aperture. Left spicule long, slender, alate, 2y 2 times the length of 

 the right, which is short and thick. 



Female 7 to 20 mm. long by 300 to 500/*. or more wide. Tail 

 straight, short. Anus near the caudal apex. Vulva prominent, in 

 posterior part of body. 



