130 CALIFORNIA ACADEMY OF SCIENCES. 



cluced, much longer than the head (broken ofi" in the speci- 

 men). 



Anal long and low, the posterior rajs highest, 2^ in head, 

 the tips not reaching as far as the end of the adipose bj' 

 more than one diameter of eye. 



Ventrals broad, reaching the anal, 1^ in head. 



Pectoral spino strong, both edges roughened, I5 in head, 

 the longest rays Ij in head. 



Color, chocolate above a black lateral band, much lighter 

 below it; fins plain. 



Head 4|; depth 7; depth of caudal peduncle 14; D. I, 6; 

 A. 15. 



34. Rhamdia exsudans (Jenyns). 



35,* Rhamdia jenynsii (Giinther). 



Pimelodus gracilis Jeuyns (uot Val.). 

 Locality: Maldonado. 



■^NoTE. — The following two species from Mexico are in 

 the collection of the Museum of Comparative Zoology. 



Rhamdia Parryi sp. nov. 



Types, No. 26'292 a. Six specimens .093 — .10 m. iu length. Eio Zaua- 

 leneo, near Tonala, Chiapas, Mexico. 

 Related to ]iha7ndia jenynsii Giinthew 



Head conical, its width IJ in its length, its depth at base of occipital pro- 

 cess IJ-I5; top of head entirely covered with thin skin; fontanel extending 

 from in front of the eyes nearly to the base of the occipital process, sepa- 

 rated into two parts by a narrow bridge opposite the posterior orbital rim; 

 occipital process very narrow and short, the exposed portion as long as wide, 

 extending backward, imbedded in the skin, one-third the distance from its 

 base to the dorsal spine. Dorsal plate rather large, triangular, entirely hid- 

 den by skin, not articulating with the occipital process; space between an- 

 terior and posterior nasal openings equal to the diameter of the eye which is 

 2 in anteorbital, H in iuterocular, 5 in head. 



Maxillary barbels short, extending to or beyond dorsal fin, mentals and 

 post-mentals inserted in a nearly straight line, the former reaching edge of 

 gill-opening, the post-mentals to base of pectoral. 



Lower jaw entirely included; width of month 2|-3 in head; band of teeth 

 of equal depth in both jaws, the intermaxillary band about 3 in head. 



Dorsal spine If in head, equidistant from snout and first anal ray, highest 



