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 very hairy Chalcochares. 



A comb to front tarsi 3 



3. Metanotum hairy Sophropompilus. 



Metanotum not hairy Nannopompilus. 



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



Araclmophila. 

 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 



G. 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 species; metanotum hairy in the female at least; abdomen 



elongate Sericopompilus. 



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. .Psamnwchares. 

 Xo 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 Pompiloides. 



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



A Anoplius. 



Chalcochares, gen. nov. contains Psammochares hirsulifemur Bks. 

 Sophropompilus includes P. ingenuus, brevicornis, and hyacinthinus. 

 Nannopompilus includes N. argenteus, rafibasis^ parvus, consimilis, padrinus, 



and minusculus. 

 Arachno phila mclndes P. sciukleri Bks., divisa Cr., and pretiosa Bks., which is 



possibly the male of P. divisa. 

 Agenoideus has but one species, A. humilis Cr. 



