ART. 28 CH.\LCn) FLIES N^ORTH OF MEXICO BALDUF 13 



somewhat black; metathoiax and propodeum like the preceding 

 segment, but propodemn darker above and below; legs a shade 

 lighter than pronotum. femora tinged brown, with middle and hind 

 tibiae brown, the latter darker ; wings iridescent, stigma dark brown, 

 submarginal band light brown and reaching three-fifths across the 

 wing, its base narrower than length of stigma, widening toward 

 apex but more sharply on the inner edge, the apex broadly rounded, 

 secondary band exceedingly faint, practically wanting, petiole and 

 abdomen more or less yellowish brown. 



Head wrinkled-strigose, and finely and sparsely umbilicately punc- 

 tate compared with punctures of thorax, genae sculptured like face, 

 malar space more nearly smooth, vertex around ocelli finely punc- 

 tate; head three-fourths as long as wide, and one-fourth broader 

 than pronotum, occipital concavity approximately equal to facial 

 convexity from above; flagellar joints moderately hairy, hairs about 

 half the length of F2 and not definitelj'^ in wdiorls, facial vestiture 

 more sparse and obscure; Fl twice as long as its mean thickness, F2 

 to F5 of equal width and length, each about a third longer than 

 thick, first joint of club longer than second or third; nota of thorax 

 coarsely umbilicately punctate, sparsely hairy, sclerites well rounded 

 and parapsides fairly deep for the genus; mesopleura aciculate and 

 finely punctate; pronotum definitely narrower than head and meso- 

 thorax; parapsidal and scuto-axiliar grooves deep and entire; sub- 

 marginal vein of fore wing with a row of 12 to 15 setae; abdomen, 

 except the petiole, smooth, polished, shiny; segments 1 and 2 bare, 

 3 and 4 with a few hairs laterad, and apex of ovipositor sheath more 

 densely clothed; petiole as long as segments l-f2. and segments 1 

 to 3 constituting about half the abdomen. 



Male. — Length about 3 mm., color as in the female, but antennae 

 at times almost yellow, yet tinged with brown, and most often dusky ; 

 face rarely speckled brown ; secondary band of fore wings practically 

 lacking, and apical fourth of abdomen infumated above; form some- 

 what more slender than female; head slightly more robust than in 

 female, face strigose-punctate. malar space grooved as in female ; Fl 

 two and a half times as long as wide, F2 to F4 equal in length and 

 thickness, and each twice as long as wide; 12 to 14 setae in the row 

 on submarginal vein; abdomen polished, smooth, bare except apical 

 fourth moderately hairy. 



Type locality. — Dune Park, Porter County, Ind. 



Type. — Female, U.S.N.M. No. 42232; allotype in the same col- 

 lection. 



Paratypes. — Ten females and 4 males on points, and 3 females 

 dissected on slides, in the collection of the United States National 

 Museum; 5 females and 5 males on points in the collection of the 

 Illinois State Natural History Survey, Urbana, 111.; 21 females on 

 points and 11 dissected on slides, and 11 males on points in the 



