ART. 28 CHALOID FLIES NORTH OF MEXICO BALDUF 63 



axillae, and more or less and sometimes all of mesopleiira, brown- 

 ish yellow, darker than the yellow of the pronotum ; metanotum and 

 propodeum black, except at times the latter is faintly yellow ; apices 

 of coxae yellow, the rest black, trochanters yellow, femora and 

 tibiae mostly brownish black, their bases and apices yellow, tarsi 

 stramineous-yellow, in some specimens the coxae and most of the 

 rest of legs yellow; submarginal band pale to medium brown, ex- 

 tremely variable in size, extending from one-third to two-thirds 

 across the wing, width rather constant regardless of length, maxi- 

 mum width scarcely greater than length of stigma, band curved in 

 form, first bending toward apex, then at end turning toward base 

 of wing, tapering slightly at tip, no secondary band present; pedi- 

 cel black, abdomen brownish to black, some specimens yellow shad- 

 ing to brown on anterior-ventral part, one specimen with entire 

 abdomen yellow except dorsum, ovipositor sheath sometimes more 

 or less yellowish. 



Head three-fifths to two-thirds as long as broad, rounded above, 

 front strongly to moderately rounded and protruding, occiput rather 

 strongly convex; vertex only sparsely marked with small umbilicate 

 punctures and in part punctate, malar space and genae rather coarsely 

 wrinkled, shiny, rest of head, especially the face, coarsely reticulate, 

 punctures few, sparsely hairy, more densely hairy above oral space; 

 antennae moderately hairy, relatively robust, scape moderately thick- 

 ened near base, as long as pedicel, Fl, and part of F2 combined, 

 pedicel one-fifth longer than Fl, F2 to F5 of equal length and width, 

 each scarcely longer than broad, club slightly thicker than funicle 

 and tapering from second segment to blunt tip ; head and mesothorax 

 slightly broader than prothorax, pronotum more than twice as broad 

 as long, parapsidal grooves complete but narrow and shallow, thorax 

 coarsely umbilicately punctate and moderately hairy; anal margin 

 of wing beyond hamular fold rather strongly dilated, surface densely 

 hairy, submarginal vein with a row of 10 to 13 setae, more often 11 ; 

 abdomen rather strongly compressed, highly polished, smooth, except 

 dorsum of fifth segment sometimes feebly coriaceous, and the sides 

 of the sixth sparsely pitted near the spiracle, segments 5 and 6 

 sparsely and moderately hairy, respectively, tips of ovipositor sheaths 

 protruding rather prominently beyond apex of abdomen, region of 

 sheaths hairy, punctate. 



Male. — Length, 1,8 to 2 mm.; slenderer and generally some- 

 what darker than the female, vestiture and sculpture as in that sex ; 

 legs almost lemon yellow in a few specimens; scape slightly longer 

 than pedicel and Fl combined, pedicel and Fl almost equal in length, 

 F2 to F4 each two-fifths longer than its greatest thickness, their 

 length uniform arid each about five-sixths the length of Fl, club 



