Dec, igii.] Banks: Psammocharid^. 223 



Last joint of hind tarsus distinctly spined beneath ; in hind-wings the 



transverse median vein ends at or beyond the cubitus 5 



5. In fore-wings the first recurrent vein meets the second submarginal cell 

 at the basal third ; in hind-wings the transverse median vein is farther 

 beyond the cubitus than the width of the cell; last joint of hind tarsi 



about twice as long as the penultimate Pepsis. 



In fore-wings the first recurrent vein ends beyond the basal third of the 

 second submarginal cell; the last joint of hind tarsi is not twice as long 

 as the penultimate Priocnemoidcs. 



The Psammocharinre include a number of generic groups the principal of 

 which can be separated by the following table. There are other sections which 

 further study will doubtless show to be valid. 



1. Pronotum longer than mesonotum, nearly fiat above, scarcely arched longi- 



tudinally, last joint of hind tarsi without spines beneath; tarsi I of female 



without comb ; no erect hair on the metanotum 2 



Pronotum shorter than mesonotum, plainly arched longitudinally 3 



2. With two submarginal cells Platiiceps. 



With three submarginal cells Pedinaspis. 



3. Basal abdominal segment with appressed pubescence, different from that on 



the following segments ; pronotum with the posterior margin membranous 



and often white ; third cell as broad as long Episyron. 



Basal segment of abdomen not with pubescence different from the following 

 segments 4 



4. No erect hair on the metanotum above, only pubescence 5 



Erect hair on the metanotum above 8 



5. Metanotum produced angularly at the posterior corners ; but two submar- 



ginal cells Aporinellns n. gen. (type, Aporus fasciatus Sm.). 



Metanotum not produced angularly behind ; usually three submarginal 

 cells 6 



6. Metanotum transversely striate ; marginal cell as long as distance to 



tip ; third cell long, and wide above. 



Ridestus n. gen. (type, Psammochares transversalis Bks.). 

 Metanotum not transversely striate 7 



7. Marginal cell long, hardly its length from tip of wing ; third submarginal 



cell wide above ; basal vein of fore-wings interstitial with the trans- 

 verse Sericopompilus. 



Marginal cell short, subtriangular, much more than its length from tip of 

 wing ; third submarginal cell much narrowed, triangular, or petiolate above ; 

 basal vein usually a little before the transverse Pompiloides. 



8. A short longitudinal impressed line or groove on posterior part of the 



pronotum ; head nearly or fully as broad as long ; not wholly black 



species 9 



No such impressed line or groove on the pronotum ; often wholly black. 



Psaniniochares. 



