OF WASHINGTON. 137 



5. The two lateral thoracic costse very distinct 6 



The inner of the two lateral thoracic costse obsolete at apex, visible 



at base, but not as sharply as the outer; color piceous, with four 

 scarcely visible reddish spots on each elytron, an oblique one near 

 base, a small rounded spot near side margin at middle, a slightly 

 larger one at apical third, and a small very indefinite spot slightly 

 below this, these spots rarely well defined or absent, .pinico la, n. sp. 



6. Each elytron with one or two reddish spots; an oblique one near 



base and a round spot at apical third, the latter sometimes absent. 



ornata LeConte. 

 Each elytron with three or four reddish spots quadriguttata Say. 



7. Elytral intervals on each side with a row of well separated, small, 



round, perforate punctures, the rows separated from each other 

 by a slightly uneven median line; color testaceous, head, thorax, 



four elytral spots, and apex darker discolor, n. sp. 



Elytral intervals with two rows of more or less coarsely confluent 

 large punctures, giving the intervals a rugulose appearance 8 



8. Mandibles not visible from above, covered by the large clypeus; 



color piceous, with base largely and an indefinite spot near apex 



reddish prosopis, n. sp. 



Mandibles more or less visible from above; color variable, piceous, 

 elytra with basal and apical reddish-testaceous spot, or the spots 

 may become larger and confluent, leaving only the suture nar 

 rowly and side margins darker suffusa Casey. 



9. Reddish testaceous, head and thorax darker, elytral intervals on each 



side with one row of tubercles, leaving at middle a narrow longi 

 tudinal, nearly smooth space sulcata LeConte. 



DESCRIPTIONS OF SPECIES. 



Bitoma vittata, n. sp. 



Elongate, thorax distinctly narrowing from apex to base, piceous, 

 opaque, each elytron with a longitudinal reddish vitta not quite attain 

 ing the apex. Head granulate, finely and sparsely pubescent, ninth 

 joint of antennae not wider than the eighth. Thorax broader than long, 

 distinctly narrowing to base, apical angles not prominent, side margins 

 finely crenulate, disk with two costse on each side, the inner not as 

 distinct as the outer, surface granulate. Elytra distinctly broader than 

 the thorax at base, with three discal and one submarginal costae, which 

 are sparsely pubescent with short pale hairs; intervals with two rows 

 of tubercles, the two rows of tubercles separated by a nearly smooth, 

 longitudinal median space. Metasternum not coarsely granulate, the 

 granules slightly longitudinally confluent; abdomen feebly punctate and 

 sparsely pubescent. 



Length, 2.75 mm. 



