TWO NEW NEMATODES 

 By B. G. CHITWOOD 



Zoological Division, Bureau of Animal Industry, U.S. Department of Agriculture 



(With One Plate) 



In this paper are described two nematodes collected by the First 

 Johnson-Smithsonian Deep-Sea Expedition to the Puerto Rican Deep. 

 One of the species, Parathelandros anolis, new species, taken from a 

 lizard, Anolis cristatellus, is of special interest, since it appears to 

 belong to a group which is composed, as a rule, of parasites of 

 arthropods. The other species, Ascarophis cestus, new species, was 

 collected from a deep-sea fish, Coelorhynchus sp. 



Family THELASTOMATIDAE 

 PARATHELANDROS ANOLIS, n. sp. 



Plate I, figs. 1-6 



Male (incomplete specimen) 926 /a long by 76 fi wide exclusive of 

 lateral alae, or 137 /* wide including lateral alae. Alae distally bifur- 

 cate, sometimes tri furcate, extending from cervical region to level of 

 anus. Cuticular striae deep. Esophagus 184 fx long, consisting of a 

 corpus 140 fi long by 19 /x wide, an indistinct isthmus, and a bulb 43 ju, 

 long by 43 fi wide. Excretory pore 270 fx from anterior extremity. 

 Cloacal opening 220 /x from posterior extremity (distal portion of tail 

 missing). Tail attenuated, filiform, without spines. Genital papillae 

 consisting of one pair of preanal papillae, two pairs of postanal papil- 

 lae, and one medioventral double postanal papilla on posterior lip of 

 anus. Spicule absent. 



Female 2.016 to 2.58 mm long by 180 to 224 fi wide. Cuticle dis- 

 tinctly annulated in cervical and anal regions. Extremely narrow, 

 paired sublateral alae present. Oral opening trilobed. Cephalic papil- 

 lae consisting of eight large labiopapillae (dorsodorsals, laterodorsals, 

 lateroventrals, and ventroventrals), papillae unequal (see pi. i, fig. i) ; 

 amphids slightly raised, situated at posterior level of papillae. Stoma 

 inconspicuous. Esophagus 320 to 400 ix long. Corpus 230 to 245 fx 



Smithsonian Miscellaneous Collections, Vol. 91, No. 11 



