AMERICAN PHILOSOPHICAL SOCIETY. 501 



At once distinguishable from the preceding species by its 

 smaller size. 



7. B. OPPOSITUM. — Black ; elytra fuscous, each witli two 

 large remote whitish spots. 



LcHi^th one-eighth of an inch. 



Tachys i-guttatiis Melsh. Calal. 



Head black ; antenna3 brown ; base and palpi testaceous ; tho- 

 rax black, somewhat pedunculated, wider before the middle, 

 much contracted behind, posterior angles salient, acute, basal 

 edge oblique each side, and, excluding the angles, hardl}' wider 

 than the peduncle ; elytra fuscous or blackish, each with a large, 

 whitish, longitudinally suboval spot attaining the humerus and 

 exterior margin, distant from the suture, and one less than half 

 as large, rounded, placed on the disk behind the middle, striao 

 obsolete, wanting behind, punctures of the striae distinct ; feet 

 testaceous. 



Subject to considerable varieties in size and in depth of color- 

 ing of the elytra. The term A-yuttatu^ of Mr. Melsheimcr is 

 preoccupied. 



[Identical with the European B. X-mai-uhitum. — Lec] 



8. B. AFFINIS. — Black; elytra each with two large, distant, 

 obsolete, pale spots, and a smaller one on the humerus before. 



Length one-eighth of an inch. 



Thorax black, wider before the middle, much contracted be- 

 hind, posterior angle salient, acute, basal edge oblicjue [87] each 

 side, and, excluding the angles, hardly wider than the peduncle ; 

 elytra blackish, each with obsolete, marginal, pale spots, one 

 placed before the middle not attaining the humerus, one smaller 

 behind the middle attaining the margin, and one smallest before 

 the humerus, striaj impressed, wanting at tip, punctures distinct ; 

 feet testaceous. 



Very similar to the preceding, but may be distinguished by 

 the larger anterior spot being placed considerably behind the 

 humerus and by the more profoundly impressed strije. 



[Afterwards described by Dejean as B. fallax and B. Jen'piais. 

 —Lec] 

 1823.] 



