74 EDWARD P. VAN DUZEE, 



antennse and tarsi darker. Tlie hind edge of the proiiotum, the 

 inner and apical margins of the elytra, and the apex of the abdo 

 men are sanguineous. The whole upper surface is dotted with large 

 blackish punctures which become almost concolorous and distant on 

 the outer disk of the elytra. It seems to be distributed across the 

 whole northern part of the continent. I have seen specimens from 

 New York, North Carolina, Montreal (Cooley), Utah (Browning), 

 and Vancouver Island (Taylor). 



Acantliosoina cruciata Say, var. Cooleyi u. var. 



Closely allied to the Euro])caii dentata. Pale yellowish testaceous tinged with 

 greeu on the posterior disk of the pronotutn ; humeral angles and latero-posterior 

 margins of the pronotuni, a triangular indefinite spot covering most of the base of 

 the scutellum, broad inner margin of the corium connecting with a large spot at 

 the outer apical angle, and the apex of the abdomen, reddish or sanguineous. Head 

 with a very few large punctures, which are blackish on its disk becoming 

 concolorous apically ; sutures at the base of the tylus brown ; tips of the cheeks 

 attaining the apex of the tylus on either side, but slightly exceeded by its rounded 

 end. Antennae pale or almost rufous, fourth joint a little dusky, the fifth fuscous 

 beyond the middle. Pronotum a little longer than in dentata, marked with a few 

 large, scattering, black punctures, which omit the callosities and form an arcuated 

 line on the anterior submargin. Punctures on the scutellum large and scattering, 

 the narrow excavated tip smooth. Elytra more closely punctured near the inner 

 and apical margins, these punctures but little darker than the adjacent surface. 

 Membrane very slightly embrowned toward the base and outer angles. Beneath 

 pale yellowish, immaculate, with large uncolored punctures on the posterior half 

 of the propleura. Legs pale, tarsi and apex of the tibiae dusky. Genital segment 

 of the male rounded behind where there is a broad, shallow sinus extending for 

 half its width, mostly filled with a close-set brush of stiff bristles so arranged as 

 to form a triangular median notch. In dentata this sinus is indicated only by a 

 small black tooth on either side. Length 7-8 mm. 



Described from one male and two female examples collected at 

 Bozeman, Montana, by Prof R. A. Cooley. I have also examined 

 specimens, hardly separable, from New York and Canada. These 

 with further material from Prof. Cooley show connecting links with 

 cruciata that lead me to consider this as but a variety of that species. 



Acanthosoma cruciata Say is a larger insect (10 mm. long), with 

 a broader and shorter pronotum, more sinuated on its latero-poste 

 rior margin ; the tylus is a little longer, the sternal lamina is more 

 elevated between the anterior coxse, and the intermediate lateral 

 plates of the female genital segment are shorter and almost rounded 

 behind. In my variety (Cooleyi) these plates, lying between the 

 valve and the outer plates, are extended at the inner apfcal angle 

 almost or quite to the apical margin of the outer plates and are sub- 



