EIGENMANN: the PYGIDIID^, a family of south AMERICAN CATFISHES. 355 



1. Acanthopoma annectens Liitken. 



Acanthopoma annectens Lutken, I. c. (Huallaga); Eigenmann, Ann. Carnegie Mus., 

 IV, 1907, p. 119; Reports Princeton Univ. Exped. Patagonia, III, 1910, p. 401. 

 Habitat. — Huallaga. 



Known from the type 100 mm. long in the collection of Prof. R. Leuckart. 

 Anterior part, especially the head, depressed; head parabolic; eyes not large; dis- 

 tance between anterior nares twice the distance between the posterior, neither with 

 a barbel; a group of four to six large and some small spines on the opercle; another 

 larger group, ten to twelve, on the interopercle ; mouth inferior; upper jaw with six 

 to seven very regular rows of very small teeth; in the lower jaw are "naeppe mere 

 end en enkelt Roekke telstede." Free margin of the gill-membrane begins behind 

 the interopercle and is continued across the isthmus without uniting with it. 



Fig. 28. Acanthopoma annectens Liitken. (After Lutken.) 



Origin of ventrals equidistant from bases of caudal and pectoral, or tip of 

 caudal and the mouth; origin of dorsal nearly twice as far from snout as from base 

 of caudal; origin of anal under end of dorsal; caudal slightly emarginate; back with 

 obscure spots. 



Called annectens to indicate its supposed position between the Pygidiinse and 

 Stegophilinse. 



Lutken says it is nearest Henonemus microps = macrops? 



Genus XII. Ochmacanthus'* Eigenmann. (Plate XXXVII.) 



Ochmacanthus Eigenmann, Mem. Carn. Mus., V, June, 1912, p. 213. 



Gyrinurus Ribeiro, Comm. Linhas Telegraphicas Estrategicas de Matto-Grosso 



ao Amazonas, Annexo No. 5, Sept., 1912, p. 27, pi. with three figures. 



Type. — Ochmacanthus flabelliferus Eigenmann. 



^* oxi^a, TO = a hold ; dKavBo's, 6 = a spine. 



