NORTH OF MEXICO. 385 



P. cyauea, Lap. el Brulle, loc. cit. p. 892. 



From the description it i- 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 arc however, not known to me, and the matter is 1 < It with the few suggestions to 

 future students. 



Length 2, breadth 1 line. 



From North Americ i. 



A.LPHITOPHAGUS, Sleph. 



Alpbitop - pli.. Ulu-i. of I'.iit. Ent. V. p. 1'2. 



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

 cpipleurae arc entire, the prosternum not produced, (he first joint of the hind tarsi equal 

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



A. bifasciatus, Say, Diaperis Journ. Acad. III. 268, 1823; quadrip Stepli., loc. >it.. pL 01, liu. 1, 



1832. 



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

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

 Tlir latter have two yellow bands mi 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 male- are remarkable in the curious structure of the head. The epistoma is 

 deeply and bisinuately impressed along it- posterior border, slightlj impressed in the mid- 

 dle ami elevated on each -id-: the front ha- also three deep grooves forming two longitu- 

 dinal ridges, well marked and terminating between the eyes. The] are also -mailer than 

 the females." — (Duval). 



Length .< >>>— . 1 inch. 



\ot rare in tin- Middle State- and Di-t. Columbia. Occasionally found in colonii - of 

 twentj or more. A- this insect i- very rare in Europe, it ha- probably been introduced. 



LIODEM \. Zimm. 

 Liodema, Zimm., MS. Tencbrionidse. 



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

 emarginate. Prosternum convex between the coxa?, ap \ dcflexed and received, when 

 the thorax is depressed, beneath the mesosternum. The rest a- in Platydema. 



[.. lave, Bald., Platydema Journ. A' "1.. Ber. II. Vol. 1. p. 101 Liodema Zimm. MBS '■ 



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

 paler, beneath reddish brown; mouth, antenna' and legs reddish yellow; head and th 



ami HI. PHI LOS ■. BOC.— VOL. XIV. 



