Belonging to Cornell University. 255 



mm. Dorsal much longer than high ; color brown. 



brachyurus (Kner). 

 kk. Lateral scutes not keeled ; caudal forked, 

 n. Scutes striated. 



Eye 2^ in iuterorbital. Pectoral spine extends beyond the base of 

 ventral fin. Lobes of caudal much pointed. 



guacharote (Cuv. &, Val). 



nn. Scutes spiny, spines in lines ; eye 3 in interorbital. Post 



humeral ridge obtuse. Dorsal fin nearly as high as long. 



Lower lobe of caudal longest. Color olive. Four or five black 



spots along each dorsal ray mystacinus (Kner). 



jj. Dorsal 1-8. 



o. Eye G in interorbital, 15 in head. Scutes with granulated keels. 

 Bristles studding first ray of pectoral spine at middle very long, 

 shorter at base. Snout very obtuse and roiuided. Granulated 

 crests on three intermediate rows of scales. Width of head 3| in 

 total length, greater than length of head. Lobes of caudal 

 pointed * histrix (Cuv. &. Val). 



oo. Eye less than 6 in interorbital, and less than 15 in the head. 

 Keels on scutes not granulated, 

 p. Black spots on all parts of body. Head, scutes, and outer fin 

 rays covered with spines. Pectoral not longer than the head. 

 Snout depressed and rather long spiuosus (Castelnau) 



pp. No black spots. 



q. Pectoral spine covered with long hook-like bristles and ex- 

 tending somewhat beyond the base of the ventral. Snout 

 broad and elongate. Interopercle with about 15 setiform 

 spines, . Scutes of body covered with spines, longest along 

 the middle. Head large and depressed, equals 3 in the body. 



serratus (Cuv. & Val). 



qq. Pectoral spine covered with short, hook-like bristles, 

 extending to second third of ventral. Ventral spine as long 

 as that of pectoral fin. Eye 2i in interorbital, 8 in head. 

 Scutes of body each with three or four prominent spines. 

 Each jaw has six or seven stoutish teeth on each side ; each 

 has a lobe on the outer side rather distinct from the flat 

 apex fordi (Giinther) . 



20. Ileiuiaiicistrus vittattis (Steiud.) One specimen Marajo. 



21. Ileuiiaiicistriis loiigipiniiis sp. uov. 



Body heavy forward, somewhat compressed. Head broad, breadth 

 about equal to length and nearly twice the depth. Occipital shield 

 shaped, bordered by a single nuchal plate. Plates in front of and below 



* H. histrix probably belongs here. Not having access to a full description, or speci- 

 men, I am unable to learn the number of anal and dorsal rays. 



