AET. 23 REVISION OF MACROCENTRUS MUESEBECK 7 



10. Malar space about as long as clypeus ; level of lower eye mar- 



gins not distinctly below base of clypeus ; dorsum of abdomen 

 entirely black except sometimes on apex of third tergite; 



thorax black 8. harrisi De Gant 



Malar space much shorter than clypeus ; level of lower eye 

 margins distinctly below base of clypeus; abdomen with at 

 least most of the third tergite, often with more or less of first 

 and second tergites also, testaceous ; thorax varying from en- 

 tirely black to entirely testaceous 11 



11. Thorax entirely black or piceous ; mandibles crossing at 



tips 9. pyraustae Viereck 



Thorax varying from entirely testaceous to mostly blackish ; at 

 least the venter of thorax, and nearly always the prescutum, 

 yellowish ; mandibles barely meeting at tips, the teeth un- 

 usually .short 10. gifuensis Ashmead 



12. Stigma brown with a large pale spot at base, the apex also nar- 



rowly, and usually the anterior margin, pale; nervulus dis- 

 tinctly a little postfurcal ; mandibles strongly crossing at tips, 



the teeth well developed 11. amicroploides Viereck 



Stigma entirely brown ; nervulus interstitial ; mandibles very 

 short, hardly meeting at tips, the teeth very short. 



12. crocidophorae, new species 



13. First abdominal tergite more or less distinctly impressed or 



excavated medially at base in front of spiracles ; spiracles of 

 first tergite usually farther from each other than from base 

 of tergite ; stigma variable ; longer calcarium of posterior 



tibia never more than half as long as metatarsus 14 



First abdominal tergite not impressed or excavated medially at 

 base in front of spiracles ; spiracles near end of basal third 

 and farther from base of tergite than from each other ; occa- 

 sionally in uniformis the first tergite faintly, very shallowly, 

 impressed at base, but then longer calcarium of posterior tibia 

 much more than half as long as basitarsus ; stigma long, lance- 

 olate, always entirely yellow, with radius arising from beyond 

 its middle 33 



14. Extreme length of first discoidal cell not, or .scarcely, greater 



than that of first cubital ; second abscissa of cubitus more, 

 usually much more, than half as long as recurrent vein ; ba- 

 sella usually interstitial with transverse abscissa of sub- 



costella ; radius arising from well beyond middle of stigma 23 



Extreme length of first discoidal cell much greater than that of 

 first cubital ; second abscissa of cubitus not more, usually 

 much less, than half as long as recurrent vein ; basella very 

 rarely interstitial with transverse abscissa of subcostella 15 



15. Lower abscissa of basella half, or more than half, as long as 



mediella and distinctly longer than nervellus ; face conspicu- 

 ously impressed medially above ; longest segment of maxil- 

 lary palpus much longer than second segment of antennal 

 flagellum ; stigma unicolorous, yellow or brown, radius aris- 

 ing from much beyond its middle ; radial cell ending con- 

 siderably before wing apex 16 



Lower abscissa of basella much less than half as long as 

 mediella and not distinctly longer than nervellus; otherwise 

 not combining the above characters 17 



