104 PROCEEDINGS OF THE ACADEMY OF 



form. The appearance is very similar to H. f al lax Lee, but the accessory 

 sctee of the abdomen enable it to be at once distinguished. 



38. H. 1 u c i d u s. Longior ovalis, piceus, nitidus, corpore subtus, antennis 

 pedibusque pallidioribus ; thorace latitudine fere duplo breviore, lateribus de- 

 planatis antice rotundatis, augulis posticis rectis rotuudatis, basi usque ad 

 latera punctato, foveis basalibus vagis ; elytris peruitidis (maris) haud reti- 

 culatis, puncto dorsali distiucto ; abdomen setis accessoribus distinctis, basi 

 pone et inter coxas parce punctatum ; mentum dente magno armatum. Long. 

 30. 



One specimen. Nebraska, near the Rocky Mountains. Of the same form 

 as H. d e s e r t u s i but with the base of the thorax punctured and the sides 

 distinctly depressed. 



39. H. obesulus. In the list of North American Coleoptera, published 

 by the Smithsonian Institution, I referred this species to Bradycellus. The 

 examination of male specimens proves that the middle tarsi are widely dila- 

 ted in that sex. In one specimen from Lake Winnipeg, the palpi have the 

 last joint singularly impressed and concave towards the tip, which thus ap- 

 pears pointed when viewed in a certain direction. It is easily distinguished 

 from the other species having accessory ventral setae and by the elytra being 

 quite distinctly sinuate obliquely at the tip. 



On a new genus of SERRANINiE, 

 BY THEODORE GILL. 



Genus TRISOTROPIS Gill. 



Body compressed, very oblong and subfusiform, with the caudal peduncle 

 oblong and moderately contracied behind. 



Scales small, regularly imbricated. 



Lateral line parallel with the dorsal outline. 



Head moderate, oblong-rhomboid, with the profile gradually decurved to 

 the snout, and the lower jaw nearly rectilinear. Eyes oval, moderate, situated 

 entirely in the anterior half of the head, and close to the profile. Nostrils ; 

 anterior small, simple ; posterior large, divided inside by a horizontal ridge 

 into an upper and lower chamber. Preorbital bone narrower than eye. Pre- 

 optrculum far behind eyes, minutely serrated behind ; operculum with three 

 spines ; the middle continued from an oblique rib on the inner surface of the 

 bone. Scales extending over the whole head, except the preorbital region, 

 and also on the jaws. 



Mouth rather large, with the cleft moderately oblique ; supramaxillaries 

 continued backwards beyond eye. 



Teeth of the upper jaw in the outer row moderate, little curved inwards, 

 with one or two canine teeth on each side in front ; within, moveable and re- 

 cumbent, on the sides pauciserial, small inwards ; in front enlarged and 

 somewhat barbed at the points. In the lower jaw biserial on the sides ; those 

 of the outer row fixed, moderate and erect ; those of the inner larger, move- 

 able, and somewhat barbed ; in front, on each side, a canine. 



Dorsal fin with its spinous portion depressed behind, generally slightly con- 

 vex, considerably larger than the soft, and with eleven (exceptionally 10 12) 

 rather slender spines ; soft portion oblong, with about sixteen to eighteen 

 rays. 



Anal fin under the middle of the soft dorsal, higher in front than behind, 

 with the margin convex, and with three graduated spines and about eleven 

 (1012) rays. 



Caudal oblong, slightly emarginated behind. 



Pectoral fins moderate, convex behind. 



[June, 



