206 J. L. LECONTE, M. D. 



Like the preceding, prothorax with three stripes, the mifldle one V-shaped, 

 widely bifurcated in front, punctures rather strong; elytral vittee as 

 in the preceding, but the striae are deeper, the marginal stria is not con- 

 fluent with the margin, and the latter is not darker behind the epipleural 

 lobe, which is of the usual form; 2.5 — 3 mm.; Tex.*. ..8. dubiosus n. sp. 

 a. — Middle stripe of prothorax not wider in front, narrowly divided as 

 far as the middle. 

 Black, legs, ventral margins and part of upper surface yellow ; prothorax 

 nearly three times wider than long, densely rugosely punctured, margins 

 and narrow median line from front margin to middle yellow; elytra 

 with common sutural and two discoidal black stripes, narrow lateral 

 bead black, epipleural lobe wider than usual; marginaticollis Randall; 



3 — 4 mm.; Eastern, Middle and Western States 10. otUontlS Say. 



a. — Smaller, prothorax with basal spots: lateral head of elytra not dark : 

 pygidium entirely yellow. 



8. — Elytra yellow, each with two stripes and marginal bead black 9. 



Elytra yellow, with one broad stripe and marginal bead black; strongly 

 punctured, prothorax and thighs ferruginous; beneath, tibiae and tarsi 

 blackish, last ventral and dorsal segments margined with yellow; 3.5 — 



4 mm.; Gala 11. circumciuctllS Crotch. 



a. — Elytral stripe broader, sinuous on the outer side.f 

 Elytra yellow, with two discoidal stripes and marginal bead black, the 

 outer stripe narrower, interrupted, forming two or usually three spots; 

 prothorax moderately punctured, ferruginous, sometimes with sides, 

 median line and basal spots yellow; beneath blackish, legs ferruginous; 

 pygidium and margin of last ventral segments yellow; biviitatus Sa.y : 

 albescens Suffr. : 3.3 — 5.5 mm.; Western States to Col.: Tex. 



12. vidnatiis Fabr. 

 a. — The ferruginous color of the prothorax is replaced by blackish brown, 

 the elytral stripes are wider, and the outer one is nearly entire; New 

 Hampshire, (Blanchard). 

 9. — Shining black, head and legs spotted with white; prothorax with sides, and 

 narrow medial line abbreviated behind, white; elytra sparsely punc- 

 tured, striae distinct at sides and behind, red, with a wide common black 

 sutural band extending nearly to the tip; 3 mm.; Fla. 



13. liiubatus Xewn». 



Opake black, elytra densely less coarsely punctured, only the outer stria 



well-defined; red with a wide common sutural band extending nearly to 



the apex, and a transverse black line at about three- fourths the length. 



running to the margin; 3.5 mm.; Texas 14. crueutiis n. sp. 



a. — Transverse black line wider and dilated at the sides, dividing the 



red into two sjiots. 

 0. — Colored as in a, punctures of elytra partly arranged in rows, pro- 

 thorax with an ill-defined smooth medial line. 

 Black, shining, prothorax usually red; elytra strongly punctured, strise 

 distinct at sides and behind, interspaces not convex; 3.8 — 5 mm.; 

 Texas 15. Iiybridus Sutl'r. 



* A larger series will probably show that this species is not valid, 

 j" The variety shows the transition towards the next species, in which the 

 outer dilated part of the elytral stripe becomes detached as a separate strijie. 



