244 MEMOIRS ON THE COLEOPTERA 



defined large lateral area of rather coarse pronotal punctures, and 

 by the much stronger and closer punctures of the pygidia; in both 

 species the very coarse humeral stria becomes rather abruptly fine 

 in basal third. 



Carcinops perlata n. sp. Similar to the preceding in general char- 

 acters but still shorter and broader, oblong-oval, polished, black, the 

 legs piceo-rufous; head similar throughout, but having the minute 

 punctures nearly uniform; prothorax nearly twice as wide as long, the 

 rather rapidly converging sides strongly, subevenly arcuate; surface 

 with minute punctulation and with a large and clearly denned, inwardly 

 angulate area at each side, which has very small and sparse but evident 

 punctures; elytra throughout as in bisculpta but still broader, and with 

 even coarser strife laterally; pygidia similar but less strongly or closely 

 punctate; mesosternum deeply sinuate medially; anterior tibiae as usual 

 in the genus. Length 2.25 mm.; width 1.5 mm. Texas (Brownsville). 



When compared with opuntice, this species is observed at once 

 to be very much shorter and broader; it is more abbreviated even 

 than in bisculpta, and in it as well as the latter, the area of more 

 distinct punctures toward the sides of the pronotum is more 

 sharply defined. In bisculpta the head is relatively smaller than in 

 either of the other two. 



These three species, as mentioned above, form so isolated a group 

 that I would propose for them the subgeneric name Carcinopsida 

 (n. subgen.). 



The two species conjuncta Say and geminata Lee., also form a 

 very peculiar group of the genus, though by no means so isolated 

 as the opunticB. section. The body is still more broadly oval and 

 rather more convex, and the mesosternum is abruptly circularly 

 emarginate at the middle, but the head and pronotum are normal 

 and the former is not beaded along the frontal margin; the elytra 

 are abnormal in striation, in the broadly arched base of the fourth 

 stria and in having a long humeral stria, but this stria is fine and is 

 abbreviated at base and not entire and in part very coarse, as it is 

 in Carcinopsida; the pygidial punctures are finer and more close-set. 

 These two species form part of Xestipyge Mars., in the Bickhardt 

 list, together with some other more or less heterogeneous species 

 from Birma, Brazil, and Mexico; they constitute probably still 

 another unnamed subgenus. In general habitus they are strongly 

 remindful of the genus Phelister. 



The genus Xextipyge was founded by Marseul upon Carcinops 



