no. 2173. A REVISION OF THE BEMBICINE WASPS— PARKER. 2 5 



6. Scutellum with a continuous fascia, rarely narrowly interrupted on the median 



line pictifrons. 



7. Second sternite more or less black; its lateral yellow spots sometimes connected 



apically 8. 



7. Second sternite wholly yellow 10. 



8. Species small, 10-12 mm.; discal marks narrow and broken; fasciae on tergites 



rather narrow, wavy, scarcely to be considered emarginate .femorata. 



8. Species larger, 16-20 mm. ; discal marks two broad lines curved and approximated 



posteriorly; fasciae on tergites broad and emarginated anteriorly 9. 



9. Tergites without posterior black border; posterior tarsi save basal joint dusky 



above spetiosa. 



9. Tergites with a posterior black border; posterior tarsi yellow formosa. 



10. Species large, 16-20 mm 11. 



10. Species small, 10 mm 12. 



11. Scape yellow; black spot on mesosternum near middle coxae tenuicornis. 



11. Scape with black spot above: mesosternum yellow bituberculata. 



12. Fascia of first tergite inclosing a medial black spot basally; head, thorax and base 



of abdomen sparsely covered with long white pubescence, most evident on 

 lateral angles of median segment scitula. 



12. Fascia of first tergite without medial black spot; not pubescent as above; face and 



sides of thorax more or less silvery exigua. 



13. Scutum without discal markings 14. 



13. Scutum with discal markings 15. 



14. Mesopleura immaculate; fascia of first tergite interrupted widely serrata. 



14. Mesopleura with large yellow spot; fasciae on tergites all continuous pulchella. 



15. Discal marks on scutum small; mesopleura black, rarely with small maculations; 



venter of abdomen almost entirely black 16. 



15. Discal marks on scutum conspicuous; mesopleura yellow; venter of abdomen 



almost entirely yellow 17. 



16. Wings infumated; fascia of first tergite widely interrupted and yellow serrata. 



16. Wings hyaline; fascia on first tergite narrowly interrupted and white plana. 



17. Species large, 18-20 mm. ; no black on mesosternum callista. 



17. Species smaller, 12-14 mm.; black spot, variable in size, in front and slightly 



above the middle coxa melanosterna. 



STICTIELLA PICTIFRONS Smith. 



Figs. 45, 46, 80, 96. 



Monedula pictifrons Smith, Cat. Hym. Brit. Mus., vol. 4, 1856, p. 335, female. 

 Monedula inermis Handlirsch, Sitz. Acad. Wissensch. Wien, Math. -Nat. CI., 



vol. 99, 1890, p. 144, male. 

 Monedula denverensis l Cameron, Trans. Amer. Ent. Soc, vol. 34, 1908, p. 235, 



female. 



Male. — Black: Labrum, clypeus, mandibles except apices, scape, 

 basal segments of flagellum below, lower part of frons extended 

 upward between antennae, semicircular spot before anterior ocellus, 

 sometimes connected with the yellow of the frons below, broad ante- 

 rior orbits, posterior orbits broad below, posterior border of pronotum 

 connected on tubercles with large spot on sides of prothorax, spot 



1 Mr. Rowland E. Turner has written Mr. Rohwer as follows: "I had placed the types of denverensis Cam. 

 and pictifrons Sm. together. They are certainly the same species although the carina of the anterior ocellus 

 is more clearly defined in denverensis giving the depression a deeper appearance. The shape of the second 

 cubital cell is the same." 



