246 CUKCULIOJs^ID^. 



iLeConte. 



Three specimens from Illinois. The ventral surface is nearly smooth; the 

 fifth segment punctulate and broadly concave. 



MICROMASTUS n. g. 



I have established this genus upon the C^alifornian Cvyptovhynchus gra- 

 cilis Boh., Eugenics Resa, Col. 140. 



It is related by the short metasternum and indistinct side pieces to 

 Acalles, but differs by the mesosternum l)eing small, and but very slightly 

 prominent, though the concavity of the front perpendicular surface shows 

 that the tip of the beak rests against it in repose; the pectoral canal is deep, 

 though not sharply limited Ijehind the front coxse, which are nearly 

 contiguous. The body is elongate; the elytra wider than the prothorax, 

 elongate-oval, sharply margined at the base, with the humeri not promi- 

 nent. The prothorax is longer than wide, broadly rounded on the sides, 

 truncate in front, with the postocular lobes nearly obsolete, and fringed 

 with vibrissie. Head convex, eyes small, coarsely granulated; beak as long 

 as the prothorax, not stout, slightlj^ curved, rather depressed at tip; an- 

 tennae inserted about one-fourth from tip, slender; club pubescent, not very 

 distinctly annulated on the outer half. Legs moderate, thighs scarcely cla- 

 vate, feebly toothed beneath; tibia> (front pair) sinuate on inner side; tarsi 

 with third joint broad, bilobed, fourth as long as the others united; claws 

 large, divergent, simple. Ventral sutures straight; second and fifth seg- 

 ments equal to third and fourth united. 



1. M. gracilis (Boh.), 1. c.sup. {Cryptorliynclm.s). 



Elongate, brown, thinly clothed with white pul)cscence, beak punctured 

 and striate towards the base, with a narrow, smooth dorsal line. Prothorax 

 deeply and coarsely punctured. Elytra with rows of approximate, quadrate 

 punctures ; interspaces narrow, convex ; behind the middle on each side are two 

 spots of white pubescence; the hinder one extending from the first to the fifth 

 stria, the anterior one from the fourth to the sixth. Beneath coarsely and 

 densely punctured. Length 3.6 mm. ; .15 inch. 



San Francisco; collected by Mr. Henry Edwards; the specimen is very 

 imperfect. 



PSEUDOMUS Sch. 



In this genus the metasternum, though short and without distinct epis- 

 terna is longer than in Acalles, and nearfy or quite as long as the first ven 

 tral; the mesosternum is horizontal, continuing the plane of the metaster 

 num, with which it is closelj' united; the emargination is deep, extending 

 to about the middle of the coxoe. The second ventral is not longer than the 

 third or fourth separately; the fifth is a little longer. The thighs are armed 

 with a tooth in some species, unarmed in others; the tibite are straight, 

 slightly mucronate at tip; tarsi with third joint broadly dilated; fourth joint 

 of usual size; claws simple, divergent. The beak is more slender than in 

 Acalles, and the general outline is that of Chalcodermus. 



1. Ps. truncatus, n. sp. 



Dark brown, thinly clothed with small, brown scales; l)eak slender, as long 



