^ 



2T0 PROCEEDINGS OF THE ACADEMY OF 



PIMELODTJS LATERISTRIGA, Miill. Troscli. 



Gunth., Catal. v. 118. 



Differs somewhat from Giinther's description, i.e.^ in the longer 

 beards and one soft ra}'' less in dorsal and anal fin. Radii D. I. 

 6, A. 11, Y. 6. Maxillary barbels reaching to three-fourths the 

 length of the adipose fin ; exterior mentals to end of pectorals. 



DOKAS GRYPUS, Cope, sp. nov. 



Lateral shields twenty-eight, short vertically, and furnished 

 with a single strong reverted spine. Tail shielded above and be- 

 low from opposite the twenty-first. Head broad, flat above, with 

 a short concavity in the position of the fontanelle. Casque broad, 

 obtusely roof-shaped, sending a process back on each side the 

 dorsal fin. Body slender. Pectoral spines very powerful, reach- 

 ing to beyond dorsal fin (in two specimens), with strong serra- 

 tions. Dorsal spine strong, longitudinally striate, not serrate. 

 Postclavicular process long and strong, reaching as far as the 

 process of the casque, with an external row of teeth, which are 

 proximally in a groove. Humeral process of coracoid swollen 

 laterally, striate grooved. Top of head rugose. Diameter of 

 63^6 five times in head (to edge bony operculum), twice in interor- 

 bital space, once in muzzle. Preorbital bone with an obtuse vei-- 

 tical rido;e. Length of head 3.66 times in length to basis caudal 

 fin, greatest depth 4.2 in same. Radii D. I. 6; C. forked, 15; A. 

 12; Y. reaching to anal 8; P. I. 6. Postcoracoid processes short, 

 smooth, maxillary barbels to middle of pectoral spine. 



Color above black, belovv light brown black-dusted, gular region 

 yellowish. A yellow band on side, margined below by three broad 

 longitudinal black bars. Caudal fin black, yellow medially, anal 

 and dorsal fins black in front, yellow posteriorly ; ventrals yellow, 

 with two black cross spots. 



Total length 5 inches, = 0.1264 m.; width at humeral swellings 

 .036 m. 



This species exceeds many others in the relative size of the 

 spines and casque. 



DORAS BRACHIATUS, Cope, sp. nov. 



A rather large species, of slender form, with smooth front, and 

 very large pectoral spines. Lateral scuta forty, low, flat, and 

 wide, with a flat reverted spine on the middle, the posterior edge 



[January 16, 



