254 Journal New York Entomological Society. t"^'°>- ^^- 



Elytra without trace of tuberculiform elevations. 



confluetis. 

 Prothorax with large discal black spot, which is sometimes 

 divided or even entirely lacking in vittatus and 

 marginellus. 

 Pale lateral and sutural margins of elytra very narrow 

 and never entire, second joint of antennae f,^) obvi- 

 ously transverse necopinus. 



Pale margins of elytra entire. 



Basal joint of antennae (J") short, thick, broadly sub- 

 ovate triangular, as wide as long or virtually so 

 when viewed from the front ; second joint not or 



but very slightly wider than long marginellus. 



Basal joint of antennas ((^) much less stout and dis- 

 tinctly longer than wide, second joint usually as 



long as wide vittatus. 



Prothorax finely alutaceous and dull throughout, the punctures fine, sparse and 

 evenly distributed over the entire disk; form depressed, size small (3-3^ 

 mm.) punctulatus. 



Group C. 



Prothorax rufous with two elongate discal black spots, size large — 6j/^-7J^ mm. 



validus. 

 Prothorax rufous, immaculate. 



Wings rudimentary or wanting, elytra narrow at base, head in great part 



red, basal spots of elytra elongate crusoe. 



Wings developed, elytra wider at base and with the basal spots not elongate. 

 Basal joint of antennae in the J' sinuately excavate or impressed on its 

 posterior face. 



Abdomen and legs red, the tibiae usually dusky pulchellus. 



Abdomen heavily maculate with black, rarely entirely red, legs 



black histrio. 



Basal joint of antennae in the (^ not sinuate posteriorly. 



Head rufous with a small central bluish spot, legs and abdomen 



entirely pale scutellatus. 



Head black, frontal margin yellow as far as the eyes, its posterior 



border not lobed similis. 



Head black, front with a posteriorly trilobed yellow margin, the 



lateral lobes attaining the eyes tibialis. 



Head black, front without or with very narrow yellow border, its 

 posterior edge straight. 

 Basal joint of antennas in the ^ slender, fully twice as long 



as wide, elytra coarsely densely punctate confluens. 



Basal joint of antennae in the c? thicker and shorter, barely % 

 longer than wide, elytra less coarsely punctate. 



