OP NATURAL HISTORY. 78ji 



^ M. BREVis.—Black ; not remarkably hairy ; anterior tarsi 

 simple ; abdomen short. 



Inhabits Indiana. 



$ Body black, somewhat polished : head densely covered 

 with long, yellowish hairs in front : thorax with whitish hair, 

 sometimes tinged with yellowish, and not concealing the surface : 

 wings a little fuliginous, tinged with violaceous : venter not, or 

 hardly longer than broad : tergum with small, dense punctures, 

 and a narrow, white band on each segment; anal segment trans- 

 versely concave, at its tip emarginate, in the middle and on each 

 side, [408] the edge has several small denticulations : anterior 

 tarsi simple : tarsi piceous at their tips. 



Length less than two-fifths of an inch. 



9 A little larger than the male ; with very little hair on the 

 front ; abdomen short conic-oval ; venter hairy. 



Length two-fifths of an inch. 



The male of this species closely resembles that of pugnatas. 

 so much so, that it might readily be considered as the same ; but 

 the anterior tarsi are not dilated, and the abdomen, althougli 

 similarly terminated, is remarkably shorter. 



M. PUGNATUS. — Black ; anterior tarsi dilated in the male, 

 with the first joint prolonged at its anterior angle beyond the tip 

 of the second joint. 



Inhabits Indiana. 



% Body black, not densely hairy : head densely covered witli 

 long whitish hairs in front : thorax with whitish hair not con- 

 cealing the surface : wings fuliginous, tinged with violaceous ; 

 venter longer than broad : tergum with small, dense punctures ; 

 and a narrow white band on each segment ; anal segment trans- 

 versely concave, at its tip emarginate in the middle, and on each 

 side the edge has several small denticulations : anterior tarsi 

 whitish, dilated, and ciliated; anterior tip of the basal joint pro- 

 longed a little beyond the tip of the second joint, and its whole 

 length excavated before ; anterior tip of the second joint also 

 prolonged almost to the tip of the third joint; fourth joint not 

 dilated : anterior tibiae with dilated crowded punctures : anterior 

 coxae, each with a prominent, black spine : intermediate and 

 posterior tarsi piceous at tip. 

 1837.] 



