OF NATURAL HISTORY. ygj 



% Body black : stethidium clothed with yellow-ferruginous 

 hair : head, hair on the superior part like that of the thorax : 

 nasus with a large, yellow, transverse spot before : labrum with 

 prostrate whitish hairs, and generally an obscure yellowish, longi- 

 tudinal line : antennae, rather short, beneath excepting the basal 

 joints, dull piceous : wings hyaline : tergum, first segment, ex- 

 cept at its tip, hairy like the thorax ; second segment with a 

 white band at base and another on the posterior submaro-in, 

 united at the sides; posterior margin and transverse middle 

 black ; third and fourth segments white with black posterior 

 margins ; remainder white ; tarsi ferruginous. 



Length two-fifths of an inch. 



9 Antennas, color as in male : nasus immaculate : posterior 

 feet with long ferruginous hair. 



Length nearly half an inch. 



A common species ; at first sight somewhat -like ohliqua nob. 

 which however is much larger, the bands of the tergum much 

 narrower and more oblique than in the present species. In 

 magnitude this species does not seem to differ widely from that 

 which Drury names anmdaris ii. pi 37, /. 7. That figure is, 

 however, a very uncertain one, even as respects its genus, and in 

 my copy of the work, does not at all agree with the description 

 which accompanies it. 



The bands of the tergum have a pruinose appearance in con- 

 sequence of the shortness of the hair of which they are composed. 

 The antennae of the male do not reach the posterior extremity of 

 the thorax. [406] 



4. M. RUSTICA. — Tergum with white bands, double on the 

 Second segment; hair of the thorax whitish. 



Inhabits Indiana. 



% Body black, with whitish hair : antennae longer than the 

 stethidium ; beneath, excepting the three basal joints, dull pice- 

 ous : nasus white : thorax with whitish hair: wing-scale" black : 

 wings hyaline ; nervures fuscous : tergum, first segment, except- 

 ing at its tip, hairy like the thorax ; bands white, not much di- 

 lated ; second segment with one at base and another behind the 

 middle, confluent each side ; remaining segments with a band on 

 the middle of each : tarsi towards their tips ferruginous. 

 1837.] 



