AMERICAN COLEOPTERA. 83 



carinate, tinged with rosy each side, dorsal vitta dark; wide, somewhat dihited 

 along the base, which is rectilinear. Scutel large, obtuse behind, blackish. Elytra 

 opake, finely scabrous, with only obsolete eoste, side margin narrowly reflexed ,- 

 sides, tip and suture pale. Head black, eyes small in both sexes, front wide ; 

 antennae compressed, not serrate, second joint half as long as the third, whicli is 

 equal to the fourth. Length 6 — 7 mm. 



% . —Lower joints of antennae wider and diminishing more rapidly in width 

 than in 9> l^^t dorsal segment truncate, obtusely triangular; seventh ventral 

 emarginate, eighth narrower, obtuse at tip. 



9 • — Antennse narrower of more unifornx width ; last dorsal obtuselv triangular, 

 truncate as in the % ; seventh ventral slightly emarginate at tip. 



Not uncommon at Detroit, where it was collected by Messrs. Hubbard 

 and Schwarz ; a precisely similar specimen was taken by Mr. Bolter at 

 Lake Talioe. (alt. (3465'). California. 



This insect has a deceptive resemblance to Photinus conxangnineus^ and 

 other species of that genus. 



TElVASPIfS 11. -. 

 Antennjv) compressed, serrate, shorter in 9 than % ; second joint one- 

 half as long as third, which in the S is shorter than the fourth. Head 

 very small, prothorax feebly carinate in front. Dorsal segments strongly 

 lobed and produced backwards at the sides ; last dorsal segment in % 

 broadly emarginate witli prominent rounded angles, in 9 rounded at 

 tip ; seventh ventral in S acutely emarginate, eighth small, narrow : 

 last ventral of 9 slightly nicked at tip. Light organs wanting. Form 

 broadly oval. 



Seems to differ from Hijax by the antenna3 not being pectinate, and 

 by the light organs being entirely wanting. 



Broadly oval, fiat, black; prothorax pale, tinged with rosy, dorsal stripe and 

 hind angles blackish; elytra acutely margined, each with two divergent elevated 

 lines. Size 13 by 7: Texas and Nortliern Mexico angularis (Turham. 



PYR.4CT01IE!¥A Lee (nee Motsch.) 

 Antennte % 9 narrow, not serrate, shorter in 9 ; prothorax subcari- 

 nate, sides broadly reflexed, pale, tinged with rosy; dorsal stripe and 

 lateral cloud dusky ; elytra with suture and side margin pale. Light 

 organs well developed in both sexes, larger in % than 9 i situated in the 

 fifth and sixth ventral segments, marked each side about one-half way 

 between the middle and the side in the % with a large stigma-like pore ;* 



* This stigma-like pore, according to Dr. Hagen, is a muscular impression, caused 

 by the insertion of a large band of fibres which ran transversely outwards. The 

 function of these muscles and their relation to the light organs are not yet under- 

 stood, but next summer when living specimens can be obtained, renewed observa- 

 tions will be made. Dr. Hagen thinks that these impressions can be traced, though 

 less distinctly, in other genera of this family and also in Elateridse. I have not yet 

 been able to satisfy myself that such is the case, though doubtless the same muscles 



TKANS. AMEB. EST. SOC. IX. (5) APRIL, 1881. 



