10 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.80 



a little wider than temples ; mesdnotal lobes nearly always 

 more or less black or dusky medially ; metanotum, propodeum, 

 and basal abdominal tergites usually more or less blackish. 



24. laspeyxesiae, new species 



26. Head, thorax and abdomen black, the lower part of pleura and 



the mesosternum sometimes ferruginous 27 



Ferruginous or testaceous, often varied with black; abdomen 

 very rarely entirely black, and then head and thorax fer- 

 ruginous 28 



27. Legs, including posterior tibiae, honey-yellow ; third abdominal 



tergite completely smooth ; nervulus postfurcal by more than 



half its length 25. mellipes Provancher 



Posterior tibiae black, pale only at base ; third abdominal tergite 

 usually distinctly finely aciculate on basal half; nervulus 

 usually postfurcal by less than half its length 26. aegeriae Rohwer 



28. First and second abdominal tergites incompletely aciculate, 



the second only weakly so at base; third tergite entirely 

 smooth ; second suture indistinct, the second and third ter- 

 gites not, or indistinctly, separated; radiella not sinuate, the 

 radiellan cell not broadening from middle to apex ; wings 

 clear hyaline, with no suggestion of duskiness; posterior 

 coxae completely polished, with no transverse aciculation or 



lineolation 29 



First, second, and most of third, tergites longitudinally acic- 

 ulate ; second and third tergites separated by a fine but dis- 

 tinct suture ; radiella more or less sinuate, the radiellan cell 

 broadening a little from middle to apex; wings often a little 

 dusky ; posterior coxae usually delicately transversely acic- 

 ulate or lineolate toward apex 31 



29. Eyes rather small, not prominent, not or scarcely extending 



beyond outer margins of temples; clypeus short and broad, 

 nearly flat; face nearly twice as broad as long to base of 

 clypeus ; mesopleura and metapleura impunctate. 



27. pulchripennis, new species 

 Eyes large, prominent, extending much beyond outer margins 

 of temples ; clypeus strongly convex ; face only a little 

 broader than long; mesopleura and metapleura uniformly 

 punctate 30 



30. Abdomen entirely black, including sternites; legs infuscated ; 



hind tibiae black 28. seminiger, new species 



Abdomen brownish ferruginous, black at apex ; legs testaceous, 



including hind tibiae 29. affinis, new species 



31. Abdomen short, not distinctly longer than head and thorax 



combined ; eyes very small, not prominent ; face about twice 

 as broad as long to base of clypeus ; interfoveal line of clypeus 



hardly as long as foveo-ocular line 30. fuscipennis, new species 



Abdomen more elongate, distinctly longer than head and thorax 

 combined ; eyes prominent, extending much beyond outer 

 margins of temples; face much less than twice as broad as 

 long; interfoveal line longer than foveo-ocular line 32 



