35 



black ; nose, uppcrlip, margins of the prolhorax, and side of the elytra, 

 dusky yellow : prothorax distinctly channelled, surrounded within the 

 margin with an irregular series of punctures, interrupted at all the angles, 

 and in the middle anteriorly and ])osterior!y :" elytra sculptured, as in the 

 two preceding species, excejjt that there ;uo several very obsolete rows of 

 flat granules, scarcely discernible, between th.c suture and the first r(;w of 

 jiuncturcs ; and there is no yellow obliijue band or gleam near the apex : 

 legs black, witli the arms and i)nermediate thighs dusky or dusky lurid ; 

 the lobes of the metasternum \ er} acute, -norc than usually diverging ; 

 incurved a little at the ajjex. 



Female. Head more visib!}', though still \cr\ minutely, punctured ; 

 prothorax minutely punctured ; elytra more coarsely punctured at the 

 apex ; legs dusky lurid, posterior tibiae darker, tarsi idack ; scapulars, and 

 parapleural grossly punctured ; angle of the mesostethium crinkled : 

 posterior coxa) lightly, but not thickly, punctured; lobes of the metaster- 

 num very acute, not incurved on the apex. [Considered by LeConte 

 to be a variet\' of I). Coufiucns Say.] 



r.VMIJ.V i.VKI.MIJ.i. 



[78.J 113. (JvcLiMs A.S.SIM :1.1s A7;7{v i 't-ugih. of body 5^'- lines. 

 Two specimens taken in kit 5.'," [79.] Body de])ressed, obovate ; under- 

 neath glossy, black, slightly bronzeil ; upj)erlip iiiinutely jjunctured ; front 

 wrinkled between the eyes : nose imjjressed <>n lik h side : prothorax 

 anteriorly on each side with a transverse series of punctisres parallel with 

 the margin, and with a slight discoidal transverse imj)ression : at the base 

 obtusangular and somewhat wavy : elytra with nine very slightly im- 

 pressed furrows, the interstices of which are minutely punctured ; at the 

 apex the elytra are wavy ; epii)leura black-bronzed : legs and anus tes- 

 taceous. This species approaches very near to Gyrinus Arncricanus 

 belonging to the same genus, of which 1 at first regarded it as merely a 

 variety, but upon comparing it Avith with the s[)ecimen preserved in the 

 Linnean cabinet, it appears clearly distinct. This species is smaller, 

 bronzed above, and the interstices of the funows are without punctures. 

 [Regarded by I.eConte as synonymous with Dinaiirs (Gyriniis) Ameri- 

 ciinus I-inn. 'I'his species is common in Canada. LeConte (Pro. Acad. 

 xVat. Sci., Philada.; Dec. 1868, p. 367), says that it is "our most abundant 

 species, usually known as apple but^ ; extends from Lake Superior to 

 Texas, and from Maine to Kansa.s."] 



114. GvRiNi;s iMPRESSicoLLis A7//;r.- Length of body 4 lines. 

 Taken '\v\ Canada by Dr. Bigsby. 



