4 



North American Hymenoptera. 301 



low band on the posterior submargin, a little undulated 

 obtusely on its anterior edge, not abruptly emarginated on 



seornents 



impressed transverse line: pleura, a small yellow spot 

 beneath each wing : tvirigs hyaline, a slight dusky margin 

 at tip : feet, coxae with a yellow spot : tarsi, excepting 

 their tips ; thighs at tip or a line above, and anterior pairs 

 of tibiffi yellow: venter five spotted each side. 



Length from three fifths to seven tenths of an inch. 



This is so much like M. sululata, Nob. that it is not 

 without much hesitation that I give it as distinct. It is, 

 however, much larger and more robust, and the form of 

 the bands of the tergum is different ; those of the suhulata 

 being abruptly notched each side of the middle as in the 

 vahulus, Fabr., whereas in the bands of the present 

 species, instead of the abrupt notch, is an obtuse and 

 dilated undulation of the edge. 



A variety occurs in Missouri, of which the wings are 

 yellowish, and the second recurrent nervure is confluent 

 with the dividing nervure of the second and third cubital 



cellule. 



2. M. subulatus, Nob. (Sapyga, Western Quarterly 



Reporter.) A variety inhabits Mexico in which the ab- 

 dominal bands are less abruptly emarginate each side. 



Saptga, Latr. 

 S. centrata. Black, with yellow spots; abdomen 



5-banded. 



Inhabits United States 



thorax with a transverse 



spot each side before, two on the middle, one beneath 

 the superior wing, and two large ones behind, yellow : 



