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NATURAL SCIENCES OF PHILADELPHIA. 



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Body deep, well compressed, robust, contour slightly ovoid with 

 greatest depth at dorsal origin, predorsal edge slightly trenchant, 

 also postdorsal, abdominal edge trenchant with 19+9 serrse, of which 

 postventral larger, and other body edges all convexly rounded. Cau- 

 dal peduncle well compressed, its least depth about equal to its length. 



Head heavy, robust, compressed moderately, upper profile more 



Fig. 3. — Pygocentrus stigmaterythroeus Fowler. Type. 



inclined, first convex and then slightly concave. Lower head profile 

 a little convex and flattened sides scarcely constricted below. Snout 

 surface convex, abruptly declivous in front and length about f- basal 

 width. Eye circular, lower edge falling about level with middle in 

 greatest head depth at occiput, and about first f in head measured 

 from snout to hind edge of opercle. Mouth broadly transverse, a 

 little oblique and with strong, powerful jaws. Maxillary small, well 

 inclined, rather small, its upper hind end entirely concealed by broad 

 infraorbital, though it would reach about opposite middle of eye. Lips 

 well developed, mandibular a little thicker. Teeth only in jaws, well 

 compressed, uniserial, all with tips slightly recurved, triangular, and 

 most or at least median ones with a small and often obsolete basal 

 cusp each side. Mandibular teeth much larger than those in upper 

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