196 



J. L. LECONTE, M. D. 



flat, broader than long, slightly rounded behind, without distinct 

 angles. The fifth ventral segment of the $ is impressed with a large 

 circular rather deep fovea. 



Head and prothorax smooth, or nearly smooth; outer joints of antennse not 



wider than long; elytra black or blue 2. 



Head and prothorax distinctly punctured; outer joints of antennse transverse; 



prothorax red with two diseoidal spots; elytra with rows of punctures 



strong, blue with a red transverse band; 2.7 mm.; Ariz...5. Guerini Perb. 



2- — Oval, indigo-blue, base of antennse testaceous; prothorax opake, smooth; 



elytral rows of punctures feeble; % J; 2.5—3 mm.; Atlantic region. 



1. ater Hald. 



Ovate, steel-blue, base of antennse testaceous; prothorax with punctures 



near the base; elytral rows of punctures strong; % 9; 2.5 — 3 mm.; 



Middle and Southern States 2. sapouatns Fabr. 



Broadly ovate, black, head, prothorax, antennse and legs rufo-testaceous ; 

 prothorax opake, smooth; elytra blue, rows of punctures strong; %] 



2 mm.; S. C; Fla 3. thoracica Crotch. 



Of same form and sculpture as thoracica, black, elytra blue; prothorax 

 slightly punctured at base; antennse and legs more or less red; 1.7 — 



2 mm.; Ga.; Fla 4. auritus Hald. 



Varies a. Head and sides of prothorax reddish yellow; '^ auntus Hald. 

 " (3. Legs and antennse in great part black; % 9; ajftnis Hald. 



DIACHUS Lee. n. g. 

 This genus is established upon small species heretofore placed in 

 Crijptocejyhalus. They differ by the claws being broadly appendicu- 

 late, the antennae not more than half the length of the body, with 

 the joints 6 — 11 broader; the prosteruum is quadrate and flat as in 

 Triachus, but in D. ch/orizans is broadly concave behind, with slightly 

 prominent angles. The eyes are feebly emarginate. The striaa are 

 composed of fine punctures, and sometimes obliterated behind; the 

 outer ones are occasionally deeply impressed, and in that case extend 

 around the apical margin. The scutellum is obtusely triangular, except 

 in D. chlorizans, where it is acute. The impression of the fifth ven- 

 tral segment of the 9 is elliptical and shallow, except in that species, 

 which with more abundant material for study might perhaps indicate 

 a distinct genus. The form is cylindrical oval, and the color tinged 

 with metallic gloss, brassy, steel-blue, or green. 



Scutellum acutely triangular; body yellow, elytra metallic green; fifth ven- 

 tral segment of 9 with a large deep fovea; 2 mm.; Va. ; Mo. 



8. chlorizans Suffr. 

 Scutellum obtusely triangular; body usually dark metallic; fifth ventral seg- 

 ment of 9 with an elliptical shallow fovea 2. 



2. — Elytral striae obliterated behind the middle 3. 



Outer strise of elytra impressed, ambient at tip 4. 



