72 BULLETIN 66, UNITED STATES NATIONAL MUSEUM. 



Wings having seven primary veins, third anal missing. 



Wings with one distal detached vein between radius and medius, and one between 

 medius and cubitus; oedeagus considerably dilated at base, arising between 



two reflexed lobes 10. Acroschismus Pierce. 



(Edeagus cleft at apex 11. Schistosiphon Pierce. 



Wings with two distal detached veins between radius and medius, and one 



between medius and cubitus 18. Ophthalmochlns Pierce. 



12. Vespsexenos, new genus. 



14. Leionotoxenos, new genus. 

 17. Sceliphronechthrus,ne-w genus. 



15. Monobiaphila, new genus. 



Males unknown 



Subfamily Homilopinse Pierce. 



Genitalia consisting merely of a two-jointed plate-like exserted appendage (ninth 

 and tenth segments), oedeagus not visible (according to Templeton). 



20. Homilops Pierce. 

 Subfamily Crawfordina? Pierce. 



(Edeagus not reflexed, nor bounded at base by lobes, very narrow at base, vesiculate 

 and bent at middle, tenuate and very acute at apex; wings having six primary veins 

 from base, second anal appearing as a branch of the first anal. 23. Craicfordia Pierce. 



Subfamily Halictoxeninae Pierce. 



Maxillae with first joint longer than the second; oedeagus strongly arcuate beneath 

 at middle 21. Halictoxenos Pierce. 



Maxilla? with first joint shorter than the second; oedeagus not strongly arcuate 

 beneath at middle; wings with two detached branches of radius, and two of 

 medius between the radius and medius 22. Apractelytra Pierce. 



6. Family Halictophagid.e Pierce. 



Prothorax band-like, not interrupted. 



Prothorax simple, not arched forward; wings having seven primary veins from 

 base, with two distal detached veins between the radius and medius, cubitus 

 lacking. 



Medius simple 25. Pentacladocera Pierce. 



Medius broken, or with detached vein commencing just before the apex on 



its anal side 24. Halictophagus Dale. 



Prothorax and mesothorax arched forward, fitting into excavation of head; wings 



having seven primary veins from base, the radius meeting the costal margin, a 



detached branch of medius immediately below that vein, medius with a branch 



in front and one behind, both as a rule detached but arising close to the medius. 



(Edeagus large at base, acute and greatly reflexed at apex; antenna? with the 



third joint very short and flat; maxilla? with first joint very slender and 



over half as long as the second 26. Pentoxocera Pierce. 



(Edeagus more slender, but with reflexed apex proportionately shorter and 

 less acute than in preceding genus; antenna? with the third joint cylin- 

 drical and as long as the preceding; maxilla? with first joint very short and 

 stout, and only about one-third as long as the second; radius and medius 



basally united for a short distance 29. Neocholax, new genus. 



Prothorax represented by a pronotal and prosternal disc placed in the excavation of 

 the head and mesonotum; wings having six primary veins from base, with one distal 

 detached vein between the radius and medius and with the medius branched above 

 and below, the branches slightly separated from the main vein, cubitus and third 

 anal veins lacking 30. Anthericomma Pierce. 



.. , , T27. Aqalliavhaqus Pierce. 



Males unknown , i n * 7 ,, „ ,. 



128. Megalechthrus Perkins. 



