1865.] 411 



depressed, very closely and finely punctured, fuscous or fusco-testace- 

 ous, infuscated around the scutelluni. Abdomen narrowed towards the 

 apex, less closely and finely punctured, piceous, black in the middle. 

 Legs testaceous. 



Male : — Sixth dorsal segment of abdomen somewhat granular, the 

 apical margin acutely denticulated, and armed on either side with a 

 short, distinct spine. 



Varies by the thorax being rufo-piceous, the elytra testaceous, and 

 the abdomen rufo-piceous, black before the apex. — Erichson. 



2. Labial palpi 3-jointed, joints quite distinct. 

 a. Antennae slender; abdomen narrowed in front; ligula short, bifid: 

 labial palpi with the first joint longer, second and third equal. 



Genus 7.— TACHYUSA. Erich. 



1. Tachyusa pygmaea, Sachse. 



Myrmedonia pygmaza, Sachse, Stett. Ent. Zeits. 1852, p. 115. 

 Tachyusa pygmcea, Lee. List. Col. N. A. p. 22. 



Obscure testaceous, shining, very finely punctured and pubescent; 

 head and rings on the abdomen posteriorly, piceous ; thorax trans- 

 verse. Length 1| lines. 



Entirely reddish-brown, merely the head and a stripe over the third 

 and fifth abdominal segments, piceous-black. Head, thorax and elytra 

 extremely finely, but not very closely punctured, the abdomen at least 

 on the first segment rather more strongly punctured and covered with 

 fine greyish pubescence. Antennae about as long as the head and 

 thorax, slightly thickened towards the apex. Head somewhat smaller 

 than the thorax, rounded, flatly elevated. Thorax not quite so broad 

 as the elytra, fully half as broad as long, quadrate, the posterior angles 

 sharply rectangular, the anterior angles rounded; above flatly elevated, 

 with a depression iu front of the scutellum. Elytra as long as the 

 thorax, flat behind and bent outwardly, somewhat paler reddish-brown, 

 the outer posterior angles confusedly blackish. Abdomen more thickly 

 punctured on the three segments than on the rest. — Sachse. 



\_Hab. — Georgia ?] 



2. Tachyusa cavicollis, Lee. 



Tachyusa cavicollis, Lee. Desc. N. A. Col. p. 29. 94. 



Very elongate, piceous, densely and very finely punctured, clothed 

 with a fine cinereous pubescence; thorax broadly ( $ very profoundly) 

 channelled, scarcely shorter than broad; apical margin of elytra pale; 

 anterior segments (1 — 3) of abdomen constricted, the last piceo-testa- 

 ceous ; antennas fuscous, testaceous at base ; legs flavo-testaceous. 

 Length .10 inch. 



Hab. — Middle, Southern and Western States; common. — LeContt. 



