North American Hymenoj^tera. 405 



3, M. pruinosa. Tergum with much dilated white 

 bands ; double on the second segment ; hair on the thorax 



yellowish, 



Inhab. United States. 



^ Bodt/ black : stethiJium clothed with yellow-ferru- 

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

 the thorax : nasus with a large, yellow, transverse spot 

 .before : lahrum with prostrate whitish hairs, and generally 

 an obscure yellowish, longitudinal line : antenrKS, rather 

 short, beneath excepting the basal joints, dull piceous : 

 tvings hyaline : tergum^ first segment, except at its tip, 

 hairy like the thorax ; second segment with a white band 

 at base and another on the posterior sub-mafgin, united 

 at the sides ; posterior margin and transverse middle black ; 

 third and fourth segments white with black posterior mar- 



i 



gins ; remainder white ; tarsi ferruginous. 



Leno[th two fifths of an inch. 



9 Antenna, 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 obliqua, 

 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 annularis^ 

 ii, p/. 37, /. 7* That figure is, however, a very uncer- 

 tain 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 



m consequence 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. 



■^ 



