Belonging to Cornell University. 253 



LORICARIID.E. 



LORICARIINyE. 



16. Loricaria laeviuscnla Cuv. & Val. 169G, 1697. Itaituba, 

 Brazil. 



17. LiOricaria stiitoelii Steindachner, 1608. Two specimens. 

 Marajo. 



Plecostomin.e. 



18. Pleco!iitomii<ii emarginatus Cuv. & Val. 1690, 1694. Tro- 

 cero on Tocantins (?). 



19. Plecostomiifii plecostomus (Linn.) 1687, 1688, 1689, 1695, 

 1678, , . Seven specimens. Marajo on Tocantins. 



Key to the Species of Heitiiancistvus, 



a. Anal rays four. Head depressed, without prominence in the occipital 



region, as broad as long ; its length 3 in the total. Diameter of the 



eye 2^ in the interorbital region. Caudal forked, lobes pointed. 



trinitatis (Giinth). 

 aa. Anal rays five. 



b. Interorbital very broad, its width five times the diameter of the eye ; 



eye 10 in the head. Head much depressed, longer than broad. 



InteroiJerculum contains three kinds of spines, about twelve stiff 



slender spines slightly hooked, surrounded by a ring of setiform 



spines. The pectoral fins extend beyond the middle of ventral, and 



ventral beyond the anal heteracanthus (Giinth). 



bb. Interorbital moderate, its width containing H to 3 times the diam- 

 eter of the eye. 

 c. Body with light longitudinal bands ; fins with bluish cross bands. 

 Occiput with a slight prominence. Diameter of eye 2r^ in inter- 

 orbital itacua (Val). 



cc. Body without light longitudinal bands ; fins without bluish cross 

 bands, 

 d. Interorbital with a pair of shallow grooves. Eye 5 in the 

 head, more than one-half of interorbital. Head but little 

 depressed. Scutes of body without keel, but with vertical 

 series of spines ; the anterior scutes with one series, the middle 

 with two, and the posterior with three series. L. 1. 23. 



megacephalus (Giinth). 



dd. Interorbital without a pair of shallow grooves, 

 e. Caudal obliquely truncated. 



f. Pectorals extend to base of ventrals. 



