— 135 — 



spaces. The larger punctures in this as in the preceding species support 

 flying hairs which are not however very long or as conspicuous as in the 

 polished species of Helerachthes. 



HETERACHTHES. Neimi. 



The species of this genus are strongly allied to the preceding and 

 are easily known by the very elongate form, the large and coarsely granu- 

 lated eyes and strongly clavate thighs. The antennae 9 ^i"^ slender, but 

 the joints 3 — 6 in (^ are remarkably thickened uniformly throughout 

 the length of each joint. Three species are recognized as follows: 



SYNOPSIS OF HETERACHTHES. 



Femora strongly clavate; elytra shining, with paler markings; 



Prothorax roughly punctate without callosities nobilis. 



Pro thorax with a few pi literous punctures and callosities at middle 



quadrimaculatus. 



Femora less incrassated; elytra opaque black ebenus. 



H. nobilis, Lee. Proc. Ac. Phil. 1862, p. 41. 

 Length .50 inch. ^12^ mm. Hab. Texas. 



This species is the largest of the three. The prothorax is trans- 

 versely impressed before and behind as in the following. The elytra are 

 ornamented with two pale fasciae, one before the middle interrupted at 

 the suture and one behind the middle, angulated in front. 



H. 4-maculatus, Hald. Trans. Am. Phil. 1862, p. 43; Lee, J.A.P., ser. 2, 

 II. p. 23. 



Length .30 -.45 inch. = 7^ — ii mm. Hab. Penn., Mo. 



Varies considerably in the markings. The general color above is 

 darkish testaceous with paler spots. 



H. ebenus, Newn. Ent. p. 9; Hald., Trans. Am. Phil. X, 1847, p. 43; Lee. 

 J. A. P., ser. 2, II, p. 23; dimidiaticornls Dej. Cat. 3. ed. p. 359. 



Length .42 inch. = loj mm. Hab. Southern States. 



Very easily known by the opaque black color and structural charact- 

 ers named above. 



PLECTROMERUS, Lee. 



Contains one species: 



P. dentipes, Oliv. Encycl. Meth, V, 1790, p. 268; Ent. IV, 70, p. 29; scambus 

 Newn., Ent. p. 79; Lee, J.A.P., ser. 2, II, p. 22. 



Length .40 inch. = 10 mm. Hab. Georgia, Florida. 



The form of this species is cylindrical and the surface is polished 

 and glabrous. Prothorax nearly straight on sides. Antennce with 4th 

 joint much shorter than 5th. Thighs suddenly clavate armed beneath 

 with a broad tooth which is larger than in Curius. Color testaceous, 

 the elytra with two fuscuous bands. 



