48 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 79 



femur, brownish black, or all legs with femora mostly black in the 

 extreme instance, tibiae mostly brown-black on the same specimen 

 but usually front tibiae immaculate yellow, middle tibiae yellow 

 on inner face only, hind tibiae entirely dark brown, except bases 

 and apices; submarginal band dark brown (newly emerged speci- 

 mens), curved, narrow, twice as wide as long, about as broad as 

 length of stigma, or rarely slightly broader, reaching two-thirds 

 of way to hind edge of wing, proximal and apical margins parallel 

 or subparallel, or distinctly concave and convex, respectively, no 

 secondary band; abdomen with ventro-anterior fourth light brown, 

 sometimes entire region black. 



Head fairly robust, four-sevenths as long as wide, front seen from 

 above less than moderately rounded transversely, occiput feebly 

 concave, vertex mostly only finely punctate between ocelli and laterad 

 to eyes, also sparsely marked with shallow umbilicate pits, narrow 

 circumocular and malar spaces smooth or minutely wrinkled, genae, 

 and frons to oral region rather coarsely reticulate, pitted, and mod- 

 erately hairy ; antennae fairly stout, scape as long as pedicel, Fl, and 

 half of F2 combined, pedicel slightly longer than Fl, this one-fourth 

 longer than each of F2 to F5, these equal in length and usually as 

 broad as long, sometimes about one-seventh longer than thick, club 

 compact, as long as F5, F4, and a fourth of F3 combined ; head about 

 one-seventh wider than pronotum, latter almost as broad as mesotho- 

 rax, pronotum and mesonotum umbilicately punctate, moderately 

 hairy, hairs silvery, sides of pronotum longitudinally striate, meso- 

 pleura aciculate and minutely punctured, the anterior half more con- 

 spicuously so and convex, the posterior half less so and concave ; 12 to 

 15 but more often 12 or 13, setae on submarginal vein; propodeal 

 groove limited in front by a prominent carina in the form of a broad 

 V with rather sharply rounded apex, anterior third of groove deeper, 

 the rest broader and more shallow, and with five rugae crossing 

 somewhat parallel at irregular intervals, rest of propodeal surface 

 variously and rather coarsely reticulate; first three abdominal seg- 

 ments smooth and shiny, fourth revealing front edge coriaceous when 

 fully extended, lower portions of sides likewise coriaceous, rest of 

 surface slightly less shiny than preceding segments, posterior surface 

 adjoining ovipositor sheath punctate and moderately hairy. 



Male. — Length 2.1 to 2.8 mm., dimensions, vestiture, sculpturing, 

 and color as described above ; antennae less stout than in female, Fl 

 barelj'' longer than pedicel and a fifth longer than F2, F3, and F4, 

 latter three almost equal in length and each five-eighths as thick as 

 long, club as long as F4, F3, and a fifth of F2 combined. 



Tyfe locality. — Catlin, 111. 



Ty^e.— Female, U. S. N. M. No. 42240. 



