Cope.l ^"" [Aug. 19. 



This is the second representative of a remarkable genns recently de- 

 scribed by Giinther (Proc. Zool. Soc. London, 1868, 234), and which has 

 as yet been found only in the upper Amazon and its tributaries. The 

 opercular apparatus is so modified as to reduce the operculum to a very 

 small bone, and to give the interoperculum an entirely inferior position 

 and increased size. The general appearance is intermediate between that 

 of Hoplosternuon and Loricaria. 



From Pebas, Equador. Hauxwell's collection, with GallichtJiys asper 

 and the following species of NematognatM. 



Doras pectinifrons. Cope sp. nov. 



Radii D. I. 5, A. 12 ; P. I. 5 ; V. 6. Lateral hue 27. Superior and 

 inferior face of caudal region with shields with posterior and lateral 

 spines. Lateral plates elevated, with a prominent point posteriorly 

 directed above and below the prominent median spine. On the anterior 

 half the side one to three series of irregular posteriorly directed spines 

 above the lateral series, and a few irregular ones below it. Margins of 

 the cephalo- nuchal shield prominent all round, often recurved, rugose ; 

 pectinate above the orbits, and at the posterior projection on each side 

 the dorsal fin. Two serrate ridges mark the premaxillary spines, and 

 the preorbitaL bones are crested laterally and superiorly, the superior 

 crest colnb-like. Preopercular angle with a serrate crest ; scapula serrate. 

 Dorsal and pectoral spines elongate, both serrate before and behind, and 

 with two spinulose ridges on each side. Humeral spine reaching last 

 third of pectoral, with an external series of straight si^ines. Caudal fin 

 rounded. Maxillary barbel not quite reaching basis of pectoral spine. 

 No spine in adipose dorsal. 



Color everywhere black, gular, thoracic, and abdominal regions white 

 spotted, Caudal fin with a yellowish cross-bar near the extremity. 

 Length of type specimen three inches. 



Pebas, Equador, Hauxwell's collection. Allied technically to the D. 

 armatulus of Cuv. and Val. 



BUNOCEPHALUS ALEUROPSIS. CopC Sp. nOV. 



Radii D. 5-6, A. 9, P. I. 4, C. 10. Base of first dorsal ray nearer end 

 of muzzle than origin of caudal fin ; its distance from former a little 

 more than .4 of total length. Maxillary barbel extending to near the 

 middle of the pectoral spine. Width of head at preopercula 5.66 times 

 in length, exclusive of caudal fin. Length of caudal fin 5.75 times in 

 total length. Length of head to operculum 6.1 times in total (without 

 caudal). Five series of wartlets along each side of the tail. Tail wide 

 as deep medially, compressed distally. Length four inches ; greatest 

 (scapular) width a little less than .25 of the total (with caudal fin). 



Color brown, the head densely punctulated with white above. Sides 

 and back with dark brown blotches. Dorsal fin with extremities of anal 

 and caudals, black or blackish. 



From Pebas, Eastern Equador. John Hauxwell's collection. 



This species is near the B. gronovii Blecker, but has diff'erent radial 

 formulae and larger maxillary barbels, etc. In the latter the fins have, 

 according to Gunther, D. 5, A. 6, P. I. 5. 



