1134 FAMILY LIU. CHRYSOMELILXtt. 



2100 (6714). DIACHUS CHLORIZANS Suffr., Liimea. Eutoui., VII, 1853, 7G. 

 Oval, subf-ylindrical. Head, thorax aud legs yellow, shining. Elytra 



metallic green. Rows of elytral punctures entire. Length 2 mm. 



Lawrence and Harrison counties; rare. June 24. 



XIX. TRIACHUS Lee. 1880. 



Here belong the smallest of Chrysomelids, none of them being- 

 over 1.5 mm. in length. They are oval in form and have the claws 

 widely dilated; antennas about half as long as body, with the last 

 five joints wider; eyes feebly emarginate; prosternum flat, quad- 

 rate, margined at sides, truncate behind ; elytral striae consisting of 

 small punctures. Two of the four known species occur in the State. 



2101 (6715). TEIACHUS ATOMUS Suffr., Linnaea., Eiitoin., VII, 1853, 74. 

 Oval, convex. Piceous-brown, thorax slightly paler ; legs yellow. Tho- 

 rax smooth, feebly punctured at sides. Rows of elytral punctures obsolete 

 except on sides. Length 1.2-1.5 rnm. 



Crawford County ; scarce. June 24-July 25. Taken by sweep- 

 ing huckleberry bushes. 



2102 (6717). TRIACHL'S VACULTS Lee., Trans. Anier. Eutoru. Soc., VIII, 1880, 



197. 



Oval, convex. Dull yellow, the elytra often clouded with darker. Tho- 

 rax sparsely and finely punctured, more deeply at sides, not margined at 

 base. Rows of elytral punctures very fine but distinct on disk. Length 1- 

 1.3 mm. 



Throughout the State; common. May 16-June 29. Beaten 

 from vegetation. 



Tribe VII. EUMOLPINI. 



A large group of medium or small-sized oblong, convex (rarely 

 rounded or oval) species, usually uniform metallic, though some- 

 times dull yellow or spotted in hue. They have the head plainly 

 visible, moderate in size and deflexed: eyes more or less emargi- 

 nate; antennae usually long, filiform, widely separated at base; 

 thorax margined at base, except as mentioned in key to genera; 

 elytra rounded at tip, entire; front coxae globose, separated by the 

 prosternum, the cavities closed behind ; tarsi broad, the third joint 

 deeply bilobed, the claws toothed or cleft. 



The following paper, in addition to those mentioned under the 

 family heading, treats especially of the genera composing the tribe: 



Horn. "The Eumolpini of Boreal America," in Trans. Amer. 

 Ent. Soc., XIX, 1892, 195-234. 



Of the 19 genera ascribed to the tribe by Horn, 14 are known 

 to be or should be represented in the State. 



