6 PROCEEDINGS OF THE NATIONAL. MUSEUM vol.79 



7. Claws and pulvilli elongated 8 



Claws and pulvilli not exceeding the length of last tarsal joint; 



front fully three-fourths the width of eye; robust species 



(Illinois) cecropiae, new species (p. 34) 



8. Parafrontuls yellow or golden pollinose 9 



Parafrontals plumbeous or gray at most faintly tinged with 



yellow 14 



9. Mesouotum shining black, the stripes almost entirely obliter- 



Mesonotum obviously pollinose, the black stripes distinct at 

 least before the suture 11 



10. Abdomen with striking thick pale golden pollen extending 



almost to the hind margins on the intermediate segments and 

 obscuring the red color on sides ; palpi brownish or yellow at 



tips (Virginia, Pennsylvania, Ohio) abdominalis Townsend (p. 23) 



Abdomen distinctly reddish at sides; intermediate segments 

 thinly grayish pollinose beyond the narrow bases, the outer 

 hind corners of eacli broadly shining; palpi black or j^ellow 

 at tips (British Columbia) occidentis, new species (p. 22) 



11. Thoracic stripes broadly separated by pollinose bauds 12 



Thoracic stripes more or less fused, appearing as two broad 



black bands to the naked eye ; intermediate abdominal seg- 

 ments covered with thin uniform bluish-gray pollen except on 

 narrow hind edge of each ; palpi black on basal half, tips 

 yellow (Mexico) latevittata van der Wulp (p. 36) 



12. Abdomen broadly reddish on sides 13 



Sides of abdomen almost wholly black; fourth segment bright 



orange-yellow, destitute of pollen and shining on apical three- 

 fourths; front prominent below; face strongly receding (Man- 

 itoba, Canada) borealis, new species (p. 27) 



13. Vibrissae distinctly above front edge of mouth ; hairs on back of 



head tinged with yellow above; parafacials rather thickly 

 haired; abdomen subshining, tliinly gray pollinose, second 

 segment invariably without any median marginals; robust 

 species, length 10 to 14 mm. (New England to Mexico). 



datanae Townsend (p. 29) 

 Vibrissae on level with front edge of mouth ; hairs on back of 

 head wholly pale-gray ; parafacials sparsely haired ; abdomen 

 thickly gray pollinose on basal half or more of last three 

 segments; length 6 to 8 mm. (New England to Iowa). 



sinuata, new species (p. 25) 



14. Front one-half or more the Avidth of eye 15 



Front narrower 16 



15. Parafrontals and face plumbeous; cheeks blackish, subshining, 



very thinly gray pollinose ; abdominal hairs erect or /suberect; 



palpi largely black (Mexico) ignobilis van der Wulp (p. 16) 



Parafrontals pale grayish yellow ; face and cheeks densely gray 

 pollinose; abdominal hairs wholly depressed; palpi yellow 

 (New Mexico) duplicata, new species (p. 17) 



16. Outer genital forceps tapering outward to blunt rounded tips 17 



Outer forceps hardly at all narrowed apically, the tips subtrun- 



cate; parafrontals pale grayish yellow; mid tibiae with two 

 bristles on outer front side near middle (Texas). 



texana, new species (p. 19) 



