440 



PROCEEDINGS OF THE ACADEMY OF 



[Oct., 



TRIOHONOTIDJE. 



LESUEURINA gen. nov. 

 Tj'pe Lesueurella platycephalus sp. nov. 



Differs from Hemeroccvtes Valenciennes in the absence of the spine 

 at the anterior termination of each maxillary, the insertion of the 

 dorsal posterior to that of the anal, and the protruding mandible. 



(Named for Charles Alexandre Le Sueur, the first to study the fishes 

 in the collection of the Academy of Natm-al Sciences of Philadelphia.) 

 Lesueurina platycephala sp. nov. Fig. 9. 



Head 4^-; depth 7; D. 32; A. 37; P. 16; V. I, 5; 42 scales in lateral 

 line to base of caudal ; 5 scales obliquely back from origin of dorsal to 

 lateral line; 8 scales obliquely up behind from origin of anal to lateral 



Fig. 9. — Lesueurina platycephala Fo^Yler. (Type.) 



line ; width of head If in its length ; depth of head 2 ; twenty-ninth dorsal 

 ray about 3; thirty-third anal ray 2f; pectoral (damaged) about 1; 

 ventral (damaged) 1|; least depth of caudal peduncle 3^; snout 4f in 

 head measured from tip of upper jaw; eye 6; maxillary 2f ; interorbital 

 space 5. 



Body elongate, well compressed, and becoming depressed anteriorly, 

 so that greatest width which is at posterior margin of preopercle is a 

 little more than greatest depth of body. Greatest depth of body 

 towards end of depressed pectoral, and trunk sloping back gradually 

 from this point to least depth of caudal pedimcle with similar straight 

 profiles. Predorsal region broadly convex. Caudal peduncle well 

 compressed, deep and short. 



