SSli FAMILY XLIV. BOSTRICHIDjE. 



1683 (- -). PTILINUS PKUINOSUS Casey, Journ. N. Y. Ent. Soc., VI, 1S9S, 63. 

 Form of ruflcornis. Uniform black, opaque, aiitenme and legs reddish- 

 brown. Branch of third antennal joint one-half longer than the joint. Tho- 

 rax a little narrower than elytra, the side margins plainly serrulate through- 

 out, median line finely impressed its full length, the small basal smooth 

 protuberance obsolete. Elytra three-fourths longer than wide, male, or 

 scarcely three-fifths longer than wide, female. Length 3-3.5 mm. 



Lake County; rare. May 20. Casey's types were from "Indi- 

 ana" and Fall recognizes the species from Ontario. 



Family XLIV. BOSTRICHID^E. 

 THE POWDER-POST BEETLES. 



This family, as here limited, consists of elongate, robust or slen- 

 der species having the antennae 9- to 11-jointed, inserted at the sides 

 of the front ; eyes small ; labrum distinct ; elytra entire ; abdomen 

 with five free ventral segments ; front coxae prominent, contiguous, 

 but little extended transversely; tarsi 5-jointed, the first joint very 

 short and imperfectly separated from the second. All the species 

 live in dry wood, either in cylindrical burrows or beneath the bark, 

 and sometimes in such numbers that the timber is wholly destroyed 

 by them. About 45 species of the family are known from North 

 America. These are divided among two subfamilies, both of which 

 are represented in the State. They differ widely in character and 

 are placed together more for convenience and similarity of habits 

 than on structural grounds. 



The principal papers treating of the North American species of 

 these subfamilies are as follows: 



Horn. "Revision of the Species of the subfamily Bostrichidre 

 of the United States," in Proc. Anier. Phil. Soc., XVII, 

 1878, 540-555. 



Casey. "Coleopterological Notes III," in Ann. N. Y. Acad. 

 Sci., VI, 1891, 12-16. A synoptical table of the genus 

 Lyctits is given. 



KEY TO SUBFAMILIES OF BOSTRICHIDJE. 



a. First ventral segment scarcely longer than those which follow; an- 

 tennal club 3- or i-jointed. Subfamily I. BOSTKICHIN.E, p. S8G. 

 mi. First ventral segment much longer than the others; antennal club two- 

 jointed. Subfamily II. LYCTIN^, p. 891. 



Subfamily I. BOSTRICHINAE. 



Rather robust, oblong or elongate species, having the head usu- 

 ally deflexed and protected by the thorax; antennas widely sepa- 

 rated and inserted immediately in front of tbe eyes, upon or under 



