No. 2312. NEW NORTH AMERICAN HYMENOPTERA—ROEWER. 227 



their tarsi and middle of first tergite yellov«ash-f erruginous ; wings 



uniformly dark brown, venation, including stigma, black. 

 The paratype has the head almost entirely black. 

 Type locality. — Sabino Basin, Santa Cataiina Mountains, Arizona. 



Described from two males collected August 28, 1918, on foliage of 



Therheria by C. H. T. Townsend. 

 Type.— C&t. No. 22033 U.S.N.M. 



MICROTYPUS DIORYCTRIAE, new species. 



This species agrees very well with the generic descrif)tion given by 

 Ratzeburg and his figures of the wing venation. It is the first Amer- 

 ican species to be described in this genus. 



Female. — Length, 5.5 mm. Head shining; the face with a few 

 scattered punctures; supraclypeal foveae deep, punctiform, anterior 

 margin of the clypeus rounded; the posterior orbits much narrower 

 than the diameter of the eye; third and fourth antenna! joints sub- 

 equal; ocelli prominent; postocellar line subequal with the ocellocular 

 line; mesoscutum polished; notauli well defined, finely foveolate; de- 

 pression in front of the scutellum with one prominent median carina 

 and a number of short rugae; lateral areas of the propodeum shining, 

 impunctate; apical dorsal middle and the posterior face reticulate, 

 the sides polished, impunctate with a distinct median carina which 

 becomes weaker posteriorly and divides; mesepisternum polished; 

 legs long, slender; stigma large, triangular, the radius leaving it 

 beyond the middle; the first abscissa of the radius not quite half as 

 long as the second; nervulus postfurcal about half its length; abdomen 

 as long as the head and thorax together; the first segment longitu- 

 dinal, aciculate; the base of the second tergite witli a few aciculations; 

 the third and remaining segments polished, impunctate; lateral 

 margins of the second and base of the third depressed; ovipositor as 

 long as the body. Ferruginous; the sides of the scutellum, metano- 

 tum, propodeum, most of the mesepisternum, the first, apical margin, 

 the third, most of the fourth and ail of the following tergites black; 

 antennae and flagellum black; wmgs hyaline, iridescent, venation 

 dark brown, stigma slightly paler at base. 



Male.— Length 4.5 mm. The structure of the male agrees with 

 the female except the lateral areas of the propodeum have a few punc- 

 tures. Black; head except the interocellar area, scape, pronotum, 

 legs except the dusky posterior tarsi and bases of the hind tibiae, the 

 second and third abdominal segments ruf o-f erruginous ; vvings hya- 

 line, iridescent, venation dark brown. The extent of the black on 

 the mesepisternum and abdomen varies considerably and it may be 

 expected that specimens with more black than the description calls 

 for will be found. 



