AMERICAN COLEOPTERA. 413 



C. interrogatus, (Fabr.) Syst. El. i., 267; difficilis, Lee. Ann. Lye. v., 

 204, 1. — Ovate, sub-convex, head (vertex black), thorax (black in front and be- 

 hind), antennse, legs and underside red; elytra closely and minutely punctu- 

 late, pitch-brown irrorated with paler, an abbreviated sub-seutellar vitta, and 

 the external margin irregularly yellow; body beneath punctulate. L. -28 

 inch. 



Pennsylvania, Georgia, Texas, Missouri, California. 

 The elytra are sometimes impressed with faint punctures all over. 

 CJ. longullis, Lee. Ann. Lye. v., 204.— More elongate, narrower and rather 

 paler, the larger impressed punctures more apparent, the pattern somewhat 

 similar, the scutellar vitta smaller and narrower; metasternum clearly punc- 

 tulate with deeper punctures intermixed, lacinise dilated at the apex. % sur- 

 face opaque. L. "32 inch. 



Laramie, Nebraska, Colorado. 



COPELATUS, Er. Gen. Dyt., p. 38. (Type posticatus.) 

 Claws equal in both sexes, prosternum with an acute carina in front, 

 metasternum hardly emarginate, broad, obtuse behind, laciniae short, 

 linear, episterna not reaching the coxae; posterior femora not ciliate 

 at the apex ; the external margin of the coxal process is reduced to a 

 very fine line on the process, and is then closely approximated to the 

 medial line before it diverges towards metasternal suture, which it does 

 not reach*. % four anterior tarsi dilated and furnished with small 

 equal discs beueath. 



It appears to have escaped notice that Agabus oblongus of Europe 

 [Liopterus, Aube,] is evidently a Copelatus, and only differs in not 

 having the elytra striate. 



C. glyphicus, (Say) Tr. Am. Phil, ii., 99 ; 10-striatus, Aube, Spec, vi., 379, 

 10; punctulatus, Aube, 1. c. 381, 11. — Ovate, sub-depressed, rufo-piceous, legs 

 paler; head and thorax finely punctulate; elytra with ten impressed strife 

 in the posterior half; the external margin and apex with a few deeper punc- 

 tures; body beneath sparsely strigose, posterior femora smooth. L. - 19 — -24 

 inch. 



Var. — 9 elytra punctulate. 

 Florida, Louisiana, Texas, Kansas, Pennsylvania, Canada. 



C Chevrolatii, Aube, I. c. p. 389, 17. — Larger, elytra distinctly punctu- 

 late, the two stria? nearest the suture obliterated; posterior femora with a row 

 of 7--S impressed punctures. L. -26 inch. 



California, Texas, Arizona, Kansas, Lake Superior. 



ILYBIOSO.M A. g. n. (Type regularis.) 



Resembles llybins in convex form, sculpture and the yellow lateral 

 spots; laciniae of the metasternum linear, strongly curved, episterna 

 not reaching the coxae ; posterior tibiae and tarsi very short, the first 



TRANS. AMER. ENT. SOC. (53) JULY, 1873. 



