196 MEMOIRS ON THE COLEOPTERA 



Apex of the fifth ventral in the male narrower and distinctly sinuate, 

 not at all exceeding half the basal width 6 



6 Larger species, stout in form, black, the elytra irregularly and finely 

 mottled with testaceous as usual ; head strongly and unusually closely 

 punctate, the eyes not differing much sexually, separated by a little 

 less than three times their width in the male; prothorax fully as 

 wide as long, the apical and basal transverse depressions conspicu- 

 ous, the punctures strong and well separated, smaller and much 

 sparser than on the head; elytra with pronounced ridges and coarse 

 and perforate, evidently separated punctures; abdomen often wholly 

 black, sometimes with the segments partially rufescent; legs rufous 

 and black, with clustered pubescence as usual; tarsi wholly deep 

 black. Length (cf 9 ) 13.5-16.0 mm.; width 4.7-5.7 mm. North- 

 eastern States lineatum Oliv. 



Smaller species and relatively more slender, otherwise nearly similar, 

 except that the punctures of the head are very much more widely 

 separated and scarcely larger or more close-set than those of the 

 prothorax; eyes much more developed, separated by but little more 

 than twice their width in the male, differing more sexually, being 

 separated by nearly three times their width in the female; thoracic 

 punctures uneven and generally widely separated; elytra as in the 

 preceding but with more confluent sculpture; abdomen in great part 

 red, the last three segments of the male diminishing rapidly in length; 

 fifth segment of the female differing scarcely from that of the male, 

 being relatively shorter than usual; median low carina of the genus 

 very evident throughout the length. Length (cf 9 ) 10.8-12.2 mm.; 

 width 3.4-3.9 mm. Massachusetts and Pennsylvania. 



cariniventre n. sp. 



7 Pronotum at each side of the median line even and without trace 

 of longitudinal elevations. Body large and stout, of the usual sculp- 

 ture, coloration and general habitus; head more evidently sulcate 

 along the middle than in lineatum, the sulcus filled with dense pros- 

 trate white hairs, the punctures coarse and close-set; eyes well 

 developed, unusually convex; antennae as usual; prothorax relatively 

 larger than in any other form except crassipes, otherwise as in 

 lineatum, except that the sculpture is coarser and much denser; 

 elytra nearly twice as long as wide, subcuneiform, with more prom- 

 inent humeri than in lineatum, the ridges strong, the punctures 

 coarse and densely crowded, very much denser than in lineatum; 

 abdomen deep black throughout, shining, very finely and sparsely 

 punctate, the pubescence less clustered than usual, the carina fine; 

 fifth segment parabolic, longer than the preceding in the female; 

 legs slender, black, the femora red only toward base. Length ( 9 ) 

 17.5 mm.; width 6.3 mm. New Mexico thoracicum n. sp. 



Pronotum with a strong glabrous longitudinal elevation between the 

 median smooth line and each side; elytral ridges strong 8 



8 Form and coloration throughout nearly as in the preceding but more 

 slender; head coarsely and still more densely sculptured, without 

 so evident a sulcus and with notably less developed eyes; prothorax 

 similar in form but smaller, coarsely, closely and irregularly punctate 



