486 Memoirs on the Coleoptera 



impressed medially at base, the presternum unarmed, feebly im- 

 pressed along the middle. Length (cf ) 2.1 mm.; width 0.8 mm. 

 District of Columbia lucidula n. sp. 



18 — Size moderate to rather large, the presternum with well defined 

 ante-coxal spines in the male 19 



Size very small, the spiniform processes wanting or very feebly de- 

 veloped 28 



19 — -Body not very evidently ventricose, the elytra but little wider than 

 the prothorax ■ 20 



Body very evidently subventricose, the elytra decidedly wider than the 

 prothorax 24 



20— Prothorax subinflated, widest just behind the middle, the sides 

 subparallel and broadly, subevenly arcuate. Body very stout; 

 convex, deep black, rather shining; beak in the female much longer 

 than the head and prothorax, nearly straight, evenly and but just 

 visibly arcuate, nearly smooth; prothorax fully a fifth wider than 

 long, the apex evidently constricted and slightly more than half as 

 wide as the base; punctures fine and sparse; smooth line lost 

 anteriorly; elytra two-fifths longer than wide, slightly wider than 

 the prothorax and not quite twice as long, with feeble humeral 

 callus; sides parallel, gradually and obtusely, ogivally rounded in 

 apical half; grooves deep; 'intervals alternating in width, from more 

 than two to more than three times as wide as the grooves, with small 

 but distinct, sparse punctures, alternately in single line and con- 

 fused. Length (9) 3.6 mm.; width 1.5 mm. Texas (Columbus). 



ebena Csy. 



Prothorax not inflated, widest at or near the base 21 



21 — Prothorax with the sides converging from the base 22 



Prothorax with the sides parallel and feebly, subevenly arcuate, gradually 

 a little more so toward the briefly subtubulate apex; integuments 

 throughout rather shining 23 



22 — Prothorax but little shorter than wide, the converging sides becoming 

 gradually and but slightly more arcuate anteriorly, the tubulate 

 apex fully half as wide as the base, black throughout; beak evenly 

 and very feebly arcuate in both sexes, thick (cf ), strongly sculptured 

 and rather sulcate, as long as the head and prothorax, or (9 ), very 

 thin, smoother and distinctly longer; antennae very slightly behind 

 the middle (9) or at four-sevenths (cT); prothorax a fifth wider 

 than long, the sides moderately and subevenly arcuate, slightly 

 converging throughout; punctures distinct, well separated, grad- 

 ually minute toward the imperfect median smooth line; elytra two- 

 fifths longer than wide, only slightly wider than the prothorax and 

 fully twice as long, parallel, obtusely and ogivally rounded in about 

 apical half; grooves deep, very feebly subcrenulate basally; intervals 

 only just visibly alternating, flat, with punctures as in the preceding 

 but very much more minute; male abdomen feebly impressed 

 medio-basally, the prosternal spines extending rather beyond the 

 apex. Length (cf 9) 3-5-3-75 mm.; width i. 33-1. 4 mm. Missis- 

 sippi (Vicksburg). Three specimens corvina n. sp. 



Prothorax much shorter than wide, the feebly converging sides evenly 



