H. C. FALL 309 



Sides of prothorax less rounded, pubescence shorter and less con- 

 spicuous, color entirely black 1. pubescens 



Sides of prothorax more rounded posteriorly, pubescence longer and 

 more conspicuous, color black, frequently with diffuse rufous mark- 

 ings 2. haematodes 



Elyt.ral punctuation in part serially arranged; color yellowish with broad 

 diffuse brown or fuscous markings; eyes ahnost in contact in the a^. 



o. integratus 



2. Eyes contiguous in cf •"). vigilans 



Eyes not in contact. 



Pubescence unusually dense, obscuring or nearly concealing t he sculpture 

 of the head or prothorax or both. 



Head not much narrower than the prothorax; black, cl\H:i with 



fulvous markings ti. wickhami 



Head much narrower than the prothorax; black, ])r()thorax red in 



posterior thiixl or fourth 7. thoracicus 



Pubescence much sparser, not conceahng the scidjjture 3 



3. Prothorax without trace of median smooth line 4 



Prothorax with narrow- entire or subentire smooth median line. 



Prothorax with sides more rounded, not or scarcely wider at base than 

 at basal third. 



Black, side margins of prothorax and humeral and apical margins 

 of elytra yellow, the disk also frequently with pale markings; more 



rarely in great part pale S. analis 



Rufo-testaceous with faint rufous or livid clouds, which are rarely 

 more pronounced; eyes as a rule less widely separated . .9. desertus 

 Prothorax conical, widest at base, sides less rounded. 



Rufo-testaceous, the prothoracic M faintly indicated by brownish 

 shades, interstitial punctures of the elj-tra coarser and n.ore muiier- 



ous; form stouter as a rule 10. xanti 



Fulvo-testaceous, prothoracic M black and sharply outlined, rarely 

 fainter; elytra either entirely yellow or with blackish markings 

 which vary much in extent and intensity, interstitial punctures finer 

 and less numerous; form a little less robust as a rule. 



11. marmoratus 



4. Surface pohshed throughout; rufo-testaceous, elytra with subsutural and 



marginal black stripes, which are connected narrowly along the base and 



more broadlj- along the declivity ■!• connesrus 



Surface alutaceous and more or less strongly opaque. 



Testaceous, with faint diffuse darker shades, the latter sometimes more 

 pronounced and occasionally involving the entire disk of both thorax 

 and elji^ra except a narrow pale external margin; eyes in the d^ sepa- 

 rated by about I5 times the length of the basal antennal joint. 



14. brunneus 



Black, side margin of jirothorax and occasionally of the elytra, csix'cially 



at the humeri, pale, disk rarely feebly and obscvu-ely varied with i)ale; 



eyes in the cf separated by much more than twice the lengtii of the 



TRANS. AM. ENT. SOC, XLI. 



