1284 



FAMILY LVII. — LAGRIIDiE. 



Family LVII. LAGRIIDJS. 

 The Lagriid Bark Beetles. 

 This family comprises a few elongate, slender beetles, having 

 the thorax subcylindrical, narrower than elytra and the color more 

 or less brassy or bronzed. From the Tenebrionida?, to which they 

 are closely related, they are separated only by having the front 

 coxae much more prominent and the next to last joint of tarsi 

 dilated and spongy beneath. They occur beneath bark and on 

 leaves, the larva* feeding freely on foliage and being much less retir- 

 ing m habits than those of the Tenebrios. 



In addition to the characters mentioned, the Lagriidse have the 

 head prominent, horizontal and more or less constricted behind the 

 eyes, which are transverse, emarginate and rather coarsely granu- 

 late; antennae 11-jointed, nearly filiform and inserted under very 

 small, oblique frontal ridges, the terminal joint as long as the three 

 to five preceding together; front coxal cavities closed behind; ely- 

 tra rounded at tips, covering the abdomen, which, in our genera, 

 has six ventral segments visible; legs slender, the next to the last 

 joint of all the tarsi dilated, emarginate and clothed beneath with 

 a dense bunch of hairs; tarsal claws simple. But eight species of 

 the family are recognized from the United States. These are dis- 

 tributed among two genera and are treated in the single paper: 

 Horn,—" Miscellaneous Coleopterous Studies— Lagriidaa, " in 

 Trans. Amer. Ent. Soc, XV, 1888, 28-32. 



KEY TO THE GENERA OF LAGRIID 2E. 



a. Head not constricted to a neck; elytra very coarsely punctate, without 

 definite stria? ; eyes transverse, reniform, not prominent 



I. Arthromacra. 



aa. Head constricted behind the eyes; elytra distinctly striate; eyes large, 

 convex and prominent. IL g TATIRA ' 



I Arthromacra Kirby. 1837. (Gr., "a joint + long.") 

 This genus, sufficiently characterized in the key, is represented 

 in the State by two species. 



2377 (7637). Arthromacra ^nea Say, Long's Exped., II, 1824, 287- ibid 

 II, 191. 



Elongate, slender. Body beneath and legs dark bronze ; surface above 

 brilliant metallic blue, green, cupreous or dark bronze ; antennae reddish- 

 brown, the terminal joint usually darker; tarsi pale. Thorax cylindrical, 

 one-third longer than wide, without side margins or angles; surface, as well 

 as that of head, coarsely and rather closely punctate. Elytra parallel on 

 basal half, then feebly but distinctly widened to apex; surface coarsely, 

 closely and rugosely punctate, with vague stride only on apical third. Length 

 9.5-13.5 mm. 



