AMERICAN COLEOPTERA. 403 



black confluent dots, a black waved fascia at three-fourtbs is sometimes obso- 

 lete, sometimes well marked. L. "50 inch. 



% , elytra strigulose at the base, thorax smooth. 



Pennsylvania, Texas, Illinois, Kansas. 



Var. nigrofasciatus, Aube, 1. c., 136, 6. — Rather larger, the posterior fascia 

 distinct, the thorax strigulose in the females. 



Arizona, Mexico. 



The Texan specimens are intermediate between these two varieties. 



Th. marmoratus, (Hope.) Anim. Kingd., p. 284, t. 32, f. 1 (1832).— 

 Ovate, sub-convex, beneath rufo-testaceous, four anterior legs yellow; above 

 black, head with the clypeus and a transverse line between the eyes yellow; 

 thorax with the sides and a transverse line (interrupted in the middle) also 

 yellow; elytra variable, the most developed specimens have the margin yel- 

 low, five yellow spots near the suture (the middle one largest) four joined to the 

 margin and two small additional spots in the basal third also yellow. L. -50 

 inch. 



9 , elytra strigulose at the base, thorax smooth. 



Arizona, Oregon (Mexico). 



The elytral markings are very variable in extent; Aube" appears to 

 have placed this insect in ffydaticus, but erroneously. 



GR4PIIODERES, Esch. Dej, Cat. p. 61. (Type cinereus.) 

 Allied to Acilius by the form of the metasternuin, but with the an- 

 terior male tarsi as in Thermonectes, and the intermediate tarsi dilated, 

 clothed with two rows of discs; the females have no peculiar elytral 

 sculpture. 



G. cinereus, (Linn.) Fauna Suec. No. 771; faseicollis, (Harris) N. E. 

 F. vii., 156 —Slightly obovate, broad, beneath rufo-testaceous, sub-rugulose; 

 head fulvous, occiput and M-like mark black; thorax fulvous, anterior and 

 posterior margins black; elyt.ra scarcely punctulate, black margined and 

 thickly irrorated with yellow. L. -50 inch. 



Pennsylvania, New York. Aube identified this with G. zonatus, 

 but it does not appear to differ from European specimens of //. cin- 

 ereus. 



G. liherus, (Say) J. Phil, v., p. 160.— Slighty obovate, testaceous, beneath 

 rufous; front of head sides of thorax, margins and epipleurae of elytra yellow- 

 ish: elytra black thickly irrorated with yellow. L. "46 inch. 

 Pennsylvania, New York. 



HYDATECUS, Leach, Zool. Misc. Hi., 69. (Type transversal is.) 

 Convex, regularly oval, thorax not margined, presternum with a 

 rather broad oval dilatation, metasternum broad, laciniae suddenly de- 

 flexed, the apical portion linear, not dilated, episterna reaching the 

 coxal plates; posterior femora with the apical angle simple, claws un- 

 equal. 



