I 



Airr. 5 GENERIC REVISION OF THE FOSSORIAL WASPS PARKER 57 



of propodeiim rounded, its posterior surface approximately flat ; first 

 intercubitus usually strongly bent (in a few species nearly straight) ; 

 second and sixth sternites of male with or without processes; eighth 

 sternite of male ending in a single spine ; spatha of male genitalia as 

 in Figure 128. 



KEY TO SPECIES OF BEMBIX 



1. Males (visible segments in abdomen 7; segments in antenna 13) 2,. 



Females (visible segments in abdomen G; segments in antenna 12) 86- 



2. Spines of anterior metatarsus broad, flat, and black; anterior border of 



middle metatarsus at apical end drawn out into a broad, thin, wedge- 

 like process (fig. 174) regia. 



Spines of anterior metatarsus normal ; middle metatarsus not develoiied 

 as above 3, 



3. Labrum with a prominent, median, transverse notch ; anterior metatarsus 



with eight spines ; seventh tergite with distinct apical pygidial area set 



off by lateral ridges mima. 



Combination of characters as given above not present ^^4. 



4. Lateral border of seventh tergite with an emargination producing a sharp 



lateral angle or lateral spine, or with a lateral ridge that may be pro- 

 longed into a spine but is never continuous with the latero-apical margin 



of the tergite 5. 



Lateral margin of seventh tergite not as above 20. 



5. Lateral ridge or carina of seventh tergite not ending in a spine or the lat- 



eral emargination not forming a distinct, sharp angle 6. 



Lateral ridge of seventh tergite ending in a distinct spine, or the lateral 

 emargination forming a distinct lateral angle or spine 12. 



6. Scutum densely covered with short, whitish, velvety pubescence taiwana. 



Scutum not covered with dense, short, whitish, velvety pubescence 7. 



7. Scutum with prominent U-shaped discal mark fucosa. 



Scutum without discal marks 8. 



8. Middle femur bearing several spiuelike teeth (fig. 126) loupata. 



Middle femur not bearing several spinelike teeth 9. 



9. Species 20 mm. or more in length ; width of frons forming about one-third 



of total width of head 10. 



Species less than 20 mm. in length ; width of frons forming more than 

 one-third the total width of head • 11. 



10. Apex of process on sixth stei'nite not reaching apical border of the sternite ; 



seventh sternite with a prominent median carina residua. 



Apex of process on sixth sternite reaching beyond the apical border of the 

 sternite; seventh sternite with a pair of prominent lateral carinae. 



recurva. 



11. Apical segment of tarsi marked with black ; seventh tergite as in Fig- 



ure lis levis. 



Apical segment of tarsi not marked with black; seventh tergite not as 

 above opinabilis. 



12. Carina or angle on lateral margin of seventh tergite produced into a dis- 



tinct spine (fig. 204) 13. 



Lateral margin of seventh tergite showing a sharp or distinct angle but 

 not a spine (fig. 213) , 16. 



13. Labrum unusually long, reaching much beyond the anterior coxae ; apical 



part of seventh tergite rugose magdalena. 



Labrum normal ; seventh tergite punctate 14. 



