240 U. S. NATIONAL MUSEUM BULLETIN 2 09 



in profile rather triangular, with a pointed apex; forewing 2.5 to 5.7 mm. 



long. FEMORALIS GROUP 20 



10. Mesopleuron impunctate; abdomen rufous, sometimes with yellow markings; 



head and thorax mostly black; wings dark brown, or in some males sub- 

 hyaline. SUBSPECIES OF ROBINSONII 11 



Mesopleuron with numerous coarse punctures 12 



11. Flagellum blackish, often tinged with rufous; abdomen with little or no 



yellow marking; range: New Hampshire and Illinois to Florida. 



4a. robinsonii robinsonii Cresson 



Flagellum rufous, blackish apically; abdomen with yellow marking; range: 



Kansas and Texas 4b. robinsonii stigmatica Banks 



12. Flagellum rufous, blackish at the apex; wings pale to dark brown; abdomen 



usually mostly rufous, subspecies of elegans 13 



Flagellum blackish; wings black or subhj'^aline; abdomen variously colored . 15 



13. Wings dark brown; range: Carolinian and Austroriparian faunas. 



5c. elegans quaintancei Viereck 

 Wings pale brown to medium brown 14 



14. Second to fifth tergitcs black with a broad apical yellow band; range: Minne- 



sota and Alberta 5a. elegans aquilonia new subspecies 



Second to fifth tergites rufous, with or without apical yellow bands; range: 

 Upper and Lower Sonoran faunas .... 5b. elegans elegans Cresson 



15. Wings black; size large, the forewing 9 to 16 mm. long 16 



Wings hyaline or subhyaline; size smaller, the forewing 5 to 8 mm. long . 18 



16. Hind femur black; first tergite of male black with a pair of white spots. 



6. nigripes Cresson 



Hind femur rufous, usually black at each end; first tergite of male entirely 



black, or sometimes with rufous stains 17 



17. Front and middle femora and all tibiae rufous; range: southeastern North 



Carolina to Florida 7a. bipiinctata tibialis Banks 



Front and middle femora and all tibiae black; range: most of the eastern half 

 of the United States 7b. bipunctata bipunetata Say 



18. Mesopleuron with a yellow spot next to its coxa; mesoscutum with a small 



median yellow spot; median posterior part of propodeum with small 



granular wrinkling 3. longipes Smith 



Mesopleuron without a spot next to its coxa; mesoscutum usually without a 

 median yellow spot; median posterior part of propodeum with fine close 

 punctures, subspecies of cubensis 19 



19. Smaller punctures on frons and mesoscutum rather weak; abdomen of female 



mostly red, with pale yellow markings; range: Panama to southern Texas 



2a. cubensis albopicta Cresson 

 Smaller punctures on frons and mesoscutum sharp; abdomen of female black 

 with pale yellow markings; range: West Indies. 



2b. cubensis cubensis Cresson 



20. Frons with very small punctures and scattered, rather conspicuous, larger 



punctures whose diameters are about 2.0 to 3.0 as great as those of the 



smaller punctures; scutellum usually entirely black 21 



Frons with dense, moderately small punctures and scattered, inconspicuous, 

 larger punctures whose diameters are about 1.2 to 1.5 as great as those of 

 the smaller punctures; scutellum usually with a white spot 22 



21. Punctures on mesopleuron separated by about 2.5 their diameter, longer hairs 



on top of head dark brown, shorter than in C. rugata; second flagellar 

 segment about 1.6 as long as wide; male subgenital plate broadly lanceolate, 

 without longitudinal wrinkles beneath; female subgenital plate longer. 



8. pacifica, new species 



