NORTH OF MEXICO. 



385 



P. oyanea, Lap. et Brull6, loc. oit, ]>. 898. 



From the description it is fairly inferable that this species is but the female of one be- 

 longing to the group in which the head of male is corniculate. It and the two preceding 

 species are, however, not known to me, and the matter is loft with the few suggestions to 

 future students. 



Length 2, breadth 1 line. 



From North America. 



ALPHITOPHAGUS, Steph. 



A-lphitophagus, Steph., Illust. of Brit. Ent. V, p, 12. 



A genus easily recognisable in the form of the second and last joints of the palpi. The 

 epipleurse are entire, the prosternum not produced, (he first joint of the hind tarsi equal 

 to the second and third together, but shorter than the last. 



1 882 



A. bifaseiafus, Say, (Diaperis) Journ. Acad, III, S68, L8S8; quadriputtuMus, Steph., loo. cit,, pi. 24, flg. l, 



Easily known from all our species of Diaperini, by the small size, elongate oval form 

 and system of coloration. The general color is reddish brown, the elytra being darker 

 The latter have two yellow bands on each, one near the humerus and slightly oblique, 

 another behind the middle and transverse, not reaching the suture, and an elongate oval 

 spot near the apex. 



"The males are remarkable in the curious structure of the head. The epistoma is 

 deeply and bisinuately impressed along its posterior border, slightly impressed in the mid- 

 dle and elevated on each side; the front lias also three deep grooves forming two longitu- 

 dinal ridges, well marked and terminating between the eyes. They are also smaller than 

 the females."— (Duval). 



Length .08-. 10 inch. 



Not rare in the Middle States and List. Columbia. Occasionally found in colonies of 

 twenty or more. As this insect is very rare in Europe, it has probably been introduced. 



LIODEMA, Zimm. 

 Liodema, Zimm., M.S. Tenebrionidse. 



Closely allied to Platydema, but difters in having the mesosternum prominent and not 

 emarginate. Prosternum convex between the coxa-, apex deflexed and received when 

 the thorax is depressed, beneath the mesosternum. Tin- rest as in Platydema, 



L. l«ve, Hald., (Platydema) Journ. Acad., Ser. II, Vol. 1, p. 101 (Liodema) Zimm. MSB. No. 1125!). 

 Oval, convex, smooth, moderately shining; color piceous black, with the apex of elytra 

 paler, beneath reddish brown; mouth, antennae and legs reddish yellow; head and thorax 



AME1U. PHXLOSO. SOO VOL. XIV ',)! 



