232 MR. G. A. BOULENGER ON [Apr. 7, 



Mrs. Elgenmann^ has induced me to make a thorough re-examination 

 of the Siluroids collected by those gentlemen, the more so as Dr. 

 Hensel's account ^ is much in need oi revision. 



1. PiMELODUS (PiMELODELLA.) LATERISTRIGA, Mllll. & TrOSch.^ 



2. PiMELODUS (Pimelodella) nigribarbis. (Plate XXV. 



fig. 1.) 



Pimelodus {Pseudorhamdid) nigribarbis, Bouleng. Ann. & Mag. 

 N.H. (6) iv. 1889, p. 266. 



D. 1/6. A. 17. P. 1/8. 



Head bony above, granulated, once and two thirds to once and 

 four fifths as long as broad ; occipital process obtusely keeled, twice 

 as long as broad, in contact with the basal bone of the dorsal spine ; 

 length of head thrice and a half to thrice and two thirds in the total 

 (without caudal) ; eye rather large, its diameter four and a half times 

 in the length of the head, once and a half in the length of the snout, 

 twice in the interorbital space ; maxillary barbel extending to the 

 origin of the anal, outer mandibular to the extremity of the pectoral. 

 Prsemaxillary teeth present, but very feebly developed. Pectoral spine 

 a little longer than dorsal, three fourths the length of the head, 

 serrated on both sides. Dorsal fin much deeper than long, the 

 spine strong, but little shorter than the anterior branched rays, two 

 thirds the length of the head ; adipose fin one sixth to one eighth 

 of the total length (without caudal), two thirds to one half of its 

 distance from the dorsal. Depth of body about one fifth of the total 

 length. Caudal deeply forked, with the lobes pointed, the upper 

 being the longer. Upper parts and fins powdered with black, most 

 closely on the ventrals and anal and on the barbels, which are almost 

 black. 



Total length 155 millim. 



I have now before me three specimens, from the Camaquam * or 

 Icamaquam River. They differ from the description of Pimelodus 

 valenciennis, Liitk., in the width of the head being more instead of 

 less than half the length, and in the larger eye, the diameter of 

 which is contained four and a half times instead of six times in the 

 length of the head. 



1 Occasional Papers of the Calif. Acad, of Sc. i. 1890. 



^ Arch. f. Nat. 1868 & 1870. 



^ I have compared my specimens with one from the Eio das Velhas, described 

 by Prof. Liitken, and received from the Copenhagen Museum. I have seized 

 this opportunity to re-examine my P. huckleyi and compai-e it with a specimen 

 from Macacos recently received from the Museum of Comparative Zoology 

 under the name of P. huckleyi. In the types the pectoral spine is as long as 

 the distance from the anterior border of the eye to the opercular border and 

 practically smooth on its inner edge ; in the specimen from Macacos the pec- 

 toral spine is stronger, as long as the distance between the base of the maxillary 

 barbel and the ojjercular border, and its inner edge is distinctly though vei-y 

 feebly serrated. There can be no doubt that the two are distinct, and I venture 

 to propose for the species described by Dr. and Mrs. Eigenmann as P. huckleyi 

 the name of Pinudodus {Fimelodella) ekjenmanni. 



'^ Not Camapuam, as stated by mistake in the original description. 



A 



