NORTH AMEKUAN COMCOrTKKA. 13 



C-. SCiniiiiKia n. sp. — Form of domiuicana, purplish black, thorax faintly 

 jeneous, elytra with subbunieral red spot, surface very sparsely pubescent. An- 

 tennfe black; labrnni oranjie ; head closely atid moderately coarsely jiunctate: 

 thorax regularly convex, punctures moderately coarse, but not dense at middle, 

 denser and finer on the declivity, median smooth line distinct; elytra moder- 

 ately coarsely and closely punctate without order, except faintly near the apex, 

 where the punctures are less close, humeral spot covering the epipleural lobe, 

 but not the umbone : body beneath densely finely punctate and densely cinereo- 

 pubescent; legs black. Length .24 inch.; (i mm. 



Exactly of the form of dominicana, and siiiiilaily sparsely pubes- 

 cent to the eastern forms of that species. The male has a smooth 

 spot on the last ventral segment. The mandibles are, however, much 

 less prominent than in domhilcana or vittigera. 



Occurs in Arizona. 



€. Tit tigera Lee, Proc. Acad. 186L p. .357.— Less robust than dominicana, 

 piceous black, moderately shining, each elytron with a yellow vitta of variable 

 width, sometimes shortened or reduced to a humeral spot. Thoracic convexity 

 irregulftr. caused by a transverse depression across the middle, somewhat deeper 

 at the sides, punctuation coarser than in dominicana and much sparser, somewhat 

 irregularly disposed, the median smooth line feebly indicated: elytra coarsely 

 not densely punctured, the punctures not at all substriately arranged, smoother 

 at apex; body beneath black, densely punctulate, not very densely pubescent: 

 legs black, sparselj' pubescent. I>ength .12 — .22 inch.; 3 — 5.5 mm. 



The male has the mandibles strong and sid)angulate externally, 

 the last ventral with a smooth space. The female has a smooth fovea 

 in the last ventral and normal mandibles. 



The surface is sparsely pubescent, the thorax more distinctly so 

 than the elytra. 



In the usual form the elytral vitta starts at the ej)ipleural lobe, 

 curves upward without including the entire umbone, passes parallel 

 with the side margin to the apex, curving in to the suture. Speci- 

 mens occur in which the elytra ai'e entirely yellow, except a narrow 

 sutural and latei'al border. 



On the other hand the vitta may gradually shorten until only a 

 humeral spot is left. For these the varietal name (trizonensis is sug- 

 gested, from the region of their occurrence. 



In my cabinet are two small specimens A2-.14: inch, which seem 

 to me, at present, to be best placed as starved specimens. There 

 does not seem sufficient character al)out them to wai rant their being 

 distinct species. 



Occurs from Wyoujing and Dakota southwartl through Colorado 

 to Arizona. 



TRANS. .\M. KNT. SOI'. XIX. .IANU.\UV. K"'!!-'. 



