banks: new fossorial hymenoptera. 107 



1. Third joint of antennae of female barely if at all longer than the first 



joint; spines under last joint of hind tarsi very weak; clypeus not 



emarginate; often bluish species 2 



Third joint of antennae plainly longer than the first 4 



2. No comb on front tarsi; legs verj' hairy Chalcochares. 



A comb to front tarsi 3 



3. Metanotum hairy Sophropompilus. 



Metanotum not hairy Nannopomjnlus. 



4. Third abdominal segment hairy above, as well as rest of body and femora. 



Arachnophila . 

 Third segment not hairy above 5 



5. No spines under last joint of hind nor front tarsi; clypeus not emargi- 



nate; third submarginal cell not petiolate 6 



Spines distinct under last joint of hind tarsi; no malar space 9 



6. A distinct malar space between eye and base of mandibles 7 



No distinct malar space 8 



7. Comb to front tarsi; metanotum oblique; small, delicate species. 



Agenoideus. 

 No comb to tarsi; metanotum flat at base; larger, black species. 



Allocyphonyx. 



8. Fairly large sp>ecies; metanotum hairy in the female at least; abdomen 



elongate Sericopompilv^. 



Small species; metanotum not hairy above; abdomen in female not so 

 elongate Gymnochares. 



9. Clypeus of female strongly emarginate in middle; front femora with 



minute spines above 10 



Clypeus not plainly emarginate 11 



10. Pronotum arcuate behind; metanotum very hairy above . 



Lophopompilus. 

 Pronotum angulate behind; metanotum scarcely hairy above. 



Notiochares. 



11. A strong comb on front tarsi; metanotum hairy above. .Psarnmochares. 

 No comb to front tarsi; that is the spines on basitarsus are subequal 



in length 12 



12. Metanotum not hairy above; marginal cell much more than its length 



from the tip of wing PoinpiLoides. 



Metanotum plainly hairy above, marginal cell more acute at tip. 



Anoplius. 

 Chalcochares, gen. nov. contains Psarnmochares hirsutifemur Bks. 

 Sophropompilus includes P. mgenuus, brevicornis, and hyadnthinus. 

 Nannopompilus includes A'^. argenleus, rufibasis, parvus, consimilis, padrinus, 



and 7ninusculus. 

 Arachnophila includes P. scudderi Bks., divisa Cr., and pretiosa Bks., which is 



possibly the male of P. divisa. 

 Agenoideus has but one species, A. humilis Cr. 



