ART. 1(5 WASPS OF THE SUBFAMILY BKACONINAE MUESEBECK 27 



19. First abscissa of mediella distinctly shorter than the second; parapsidal 



furrows sharply impressed, the middle mesonotal lobe prominently elevated; 

 propodeum regularly areolated, the separating carinae prominent, the areas 

 usually smooth within; third segment of labial palpi extremely short, 

 sometimes indistinct; antennae usually 35 to 40 segmented; thorax black, 



with propodeum and metapleura nearly always red 20. 



First abscissa of mediella rarely distinctly shorter than the second; parapsi- 

 dal furrows usually weakly impressed, the middle mesonotal lobe not 

 prominently elevated; propodeum usually not so regularly areolated or the 

 areas rugose within; third segment of labial palpi short but nearly always 

 distinct and longer than broad; antennae usually 23 to 33 segmented, 

 rarely with as many as 36 segments; color of thorax varying from entirely 

 black to entirely testaceous 22. 



20. Posterior trochanters black; hind wings not completely infumated, the area 



behind the mediella being usually mostly hyaline 



18. calcaratus, (Cresson). 

 Posterior trochanters red, very rarely a little infuscated; hind wings uni- 

 formly infumated 21. 



21. Apical segment of all tarsi yellow; second cubital cell strongly petiolate, the 



petiole considerably longer than the first abscissa of radius 



19. usitatus Gahan. 

 All tarsi entirely black or blackish; second cubital cell nearly sessile, the 

 petiole, if distinct, not longer than the first abscissa of radius 



20. difRcilis, new species. 



22. Head unusually thin antero-posteriorly, the temples receding sharply; par- 



apsidal furrows not at all distinct; anterior and middle legs yellow; head, 



thorax, and abdomen testaceous 21. tenuiceps, new species. 



Head not especially thin, the temples not receding sharply; parapsidal fur- 

 rows more or less distinctly indicated; anterior and middle legs blackish; 

 head and thorax usually more or less black 23. 



23. Propodeum neither areolated nor rugose, mostly smooth, only slightly rough- 



ened down the middle; dorsal face of propodeum long, not rounded antero- 

 posteriorly; pleura conspicuously pubescent; antennae usually 33 to 36 

 segmented; dorsum of thorax usually mostly red; mesopleura and pectus 

 black; posterior coxae and trochanters more or less blackish 



22. ninanae, new species. 



Propodeum more or less distinctly areolated or rugose, rarely mostly smooth, 



and then the dorsal face short and strongly rounded; at least not agreeing 



entirely with the above characters 24. 



24. Posterior coxae, trochanters, and femora uniformly reddish testaceous; meso- 



notum always black 25. 



Posterior trochanters, usually at least the base of the hind femora and more 

 or less of the hind coxae, black or blackish; thorax varying from entirely 

 black to entirely red or reddish testaceous; the mesonotum often pale. .26. 



25. Antenna normally 32 to 36 segmented; parapsidal furrows very weak an- 



teriorly; temples bulging slightly but very narrow; propodeum and meta- 

 pleura nearly always red 23. acrobasidis Cushman. 



Antenna normally 27 to 29 segmented; parapsidal furrows sharply impressed 

 anteriorly; temples not very narrow; usually the propodeum, and often 

 the metapleura, black 24. erythrogaster Viereck. 



