ART. 23 REVISION OF MACROCENTRUS — MUESEBECK 41 



blackish; legs yellowish brown; wings unusually clear hyaline, iri- 

 descent; stigma dark brown with a small pale spot in the mem- 

 brane at base; abdomen brownish ferruginous, more or less infus- 

 cated, the fourth and following tergites black. 



7'y^e.— U.S.N.M. No. 43494. 



Tyye locality. — Richfield, Utah. 



Remarks. — Described from one female taken at a light trap, June 

 15, 1929. 



28. MACROCENTRUS SEMINIGER, new species 



Closely allied to pulchrl'pennis but differing as noted in the key 

 and in the discussion under that species. Also very similar to affinis, 

 from which it may be distinguished by the entirely black abdomen 

 and black posterior tibiae. 



Female. — Length 6.5 mm. Face smooth, with some weak punctures 

 above clypeus, also just below^ antennae; eyes large, extending promi- 

 nently beyond outer margins of temples; clypeus strongly convex; 

 distance from clypeal foveae to eyes shorter than length of clypeus; 

 maxillary palpi about as long as width of head ; two apical segments 

 of labial palpus subequal; antennae as long as the body or very 

 slightly longer, 39-segmented, tapering to apex. Thorax rather 

 stout, deep ; prescutum prominently elevated ; notauli distinctly f ove- 

 olate; propodeum rather broad, strongly convex, irregularly trans- 

 versely striate, more or less smooth basally; prosternum, sides of 

 pronotum, mesopleura, and metapleura uniformly punctate, shining ; 

 coxae polished ; calcaria of posterior tibia slender, the longer calcar- 

 ium nearly half as long as basitarsus; radius arising from beyond 

 middle of stigma; apex of radial cell considerably before wing apex; 

 metacarpus extending about length of second intercubitus beyond 

 apex of radial cell; first discoidal cell slightly longer than first 

 cubital ; second abscissa of cubitus half as long as recurrent ; nervulus 

 only slightly postfurcal; submedian cell nearly glabrous, with only 

 scattered rather indistinct hairs; mediella more than twice lower 

 abscissa of basella, the latter about equal to nervellus ; upper abscissa 

 of basella interstitial with transverse abscissa of subcostella ; radiel- 

 lan cell not broadening at all at apex. Abdomen not distinctly longer 

 than head and thorax combined; first tergite rather stout, hardly 

 twice as long as broad, broadly impressed at base, finely longitudin- 

 ally aciculate; second tergite only very faintly aciculate at base, not 

 separated from third, the second suture wanting; most of second, 

 and all of following tergites polished; ovipositor sheaths about as 

 long as the body. 



Head yellowish ferruginous; antennae including scape piceous; 

 palpi blackish ; thorax ferruginous, propodeum brownish black ; legs 



