THE CANADIAN ENTOMOLOGIST. 51. 



DESCRIPTIONS OF NORTH AMERICAN HYMENOPTERA, No. 5 



BY E. T. CRESSON, 

 Continued from Vol. 4, Page 231. 



Genus Microdus, Nees. 



MlCRODUS IMITATUS. N. Sp. 



5 . — Sanguineous, shining ; head, antennas, prothorax, surroundings 

 of scutellum, pleura beneath, four anterior legs, including their coxae, 

 posterior trochanters and their tibiae and tarsi, black ; sides of mesothorax 

 tinged with blackish ; metathorax coarsely punctured above with four 

 longitudinal carinas, the two central ones approximate, flanks less coarsely 

 punctured ; wings uniformly fuliginous, with the usual hyaline angular 

 streak beneath stigma ; abdomen long, narrow, polished, with a purplish 

 reflection; ovipositor longer than body. Length .37 inch. 



Massachusetts. More slender than satictus, with the mesothorax, 

 scutellum and sides of pleura sanguineous ; the metathorax is differently 

 sculptured and the posterior tibiae are black. 



Microdus simillimus. N. sp. 



$ <J . — Pale sanguineous or fulvo-ferruginous ; head, antennas, the 

 thorax, except metathorax and four anterior legs including coxas, black: 

 metathorax opaque, scabrous ; wings fuliginous ; tips of posterior tibiae 

 and tarsi more or less fuscous ; abdomen shining, suture between first and 

 second segments very deeply impressed. Length .22-27 inch'. 



New Jersey ; Pennsylvania ; Illinois. Much smaller than sanctus y 

 which it closely resembles, and from which it is at once distinguished by 

 the posterior trochanters not being black. 



Microdus calcaratus. N. sp. 



$ — Sanguineous ; head, antennae, the thorax, except metathorax, 

 four anterior legs, posterior trochanters and their tibiae and tarsi, black y 

 four anterior knees, anterior tarsi except claws, intermediate tarsi except 

 tips of joints, all the tibial spurs and apical joint of posterior tarsi, white 

 or whitish ; metathorax shining above, with carinae forming an elongate 

 central area; wings fuliginous as usual; abdomen shining, second. 



