ABT. 5 GENERIC REVISION OF THE FOSSORIAL WASPS — P.ARKER 37 



male without lateral spines; eighth sternite of male terminating in 

 three spines and in some species provided with an additional discal 

 spine; venation of wings as in Figure 14; spatha of male genitalia 

 as in Figure 32. 



KEY TO THE SPECIES OF STICTIELLA 



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



Females (antenna with 12 segments ; abdomen with 6 visible segments) _20. 



2. Middle metatarsus more or less strongly curved ; inner curved surface fre- 



quently beset with spines 3. 



Middle metatarsus not curved 13. 



3. Second sternite nontuberculate 4. 



Second sternite unituberculate 8. 



Second sternite bituberculate 9. 



4. Middle femora smoot beneath pictifrons. 



Middle femora serrate or dentate beneath 5. 



5. Pulvilli large and distinct ; apical segment of all tarsi black ; anterior tarsi 



dilated and flattened forinosa. 



Pulvilli indistinct ; tarsi normal 6. 



6. Scutum with discal marks ; abdominal fasciae all continuous melanosterna. 



Scutum without discal marks ; no continuous fasciae on sternites 7. 



7. Wings hyaline; lateral spots on sternites lacking or confined to sternites 



2 and 3 plana. 



Wings distinctly infumated ; lateral spots on sternites not confined to stern- 

 ites 2 and 3 serrata. 



8. Apical segment of anterior tarsus broadly dilated and black : process on 



second sternite blunt and strongly hirsute distally tuberculata. 



Apical segment of anterior tarsus normal form and yellow ; process on sec- 

 ond sternite pointed and smooth distally callista. 



9. Middle femora smooth below ; head narrower than thorax 10. 



Middle femora serrate or dentate below ; head normal 11. 



10. Width of second cubital cell on radial and cubital veins about equal ; second 



sternite almost wholly yellow bituberculata. 



Width of the second cubital cell on the radial vein about half its wiijth on 

 the cubital ; second sternite mostly black emarginata. 



11. Pulvilli indistinct; apical segment of tarsi normal pulchella. 



Pulvilli distinct ; apical segment of tarsi black ; anterior pair dilated 12. 



12. Large and stout, 18-20 mm. ; fasciae on tergites broad and, except first, 



continuous ; second inclosing pair of black discal spots ; fasciae on stern- 

 ites continuous or narrowly interrupted speciosa. 



Slender, about 15 mm., fasciae on tergites interrupted on 1 or 1-3, leaving 

 on one or more of these tergites a pair of yellow discal spots ; yellow on 

 sternites in form of lateral spots spinifera. 



13. Head, thorax, base of abdomen and basal joints of legs covered with long, 



dense, white pubescence ; most specimens, but not all, have the second 



sternite bituberculate scitula. 



Pubescence of head, thorax, etc., of normal character 14. 



14. Second sternite nontuberculate , tenuicornis. 



Second sternite unituberculate 15. 



Second sternite bituberculate 16. 



15. Tubercle of second sternite ending in a single point megacera. 



Tubercle of second sternite ending in two points bifurcata. 



