260 WILLIAM J. FOX. 



6. Rather densely pubescent; legs and antennae pale; space between hind ocelli 



less than that between them and eyes. Length 14 mm., .ceyx n. sp. 



Pubescence thin ; legs and antennse testaceous-brown ; space between hind 



ocelli a little greater than that between them and eyes. Length 9-10 



mm ainphioii n.sp. 



7. Antennse and legs pale; first and second dorsal segments impunctate; space 



between hind ocelli less than that between them and eyes 8. 



Antennse and legs niore or less fuscous; first and second dorsal segments punc- 

 tured, the latter very sparsely ; space between hind ocelli about equal 

 to that between them and eyes concolor Cress. 



8. Head distinctly narrowed behind eyes: wings not yellowish. Length 10 mm. 



coloradensis D. T. 



Head broad, not narrowed behind eyes; wings tinged with yellow. Length 



1(} mm Blakei Fox (nee Cam.). 



9. No black marking in the thoracic sutures, or about the coxse. Length 



8 mm contrahenda D. T. 



Sutures of thorax, especially between scutellum and middle segment and 

 about the coxae, black. Length 12 mm contrahenda? var? 



10. Wings sulihyaline, at most faintly yellow 11. 



Wings more or less subfuscous, or yellow, or yellowish with subfuscous 



clouding 14. 



11. Head broad, scarcely narrowed behind eyes; legs and antennte testaceo-fus- 



cous. apical segments usually fuscous uro Blake. 



Head narrowed behind eyes; legs and antenna? pale 12. 



12. Abdomen dark castaneous-browu palainedes n. sp. 



Abdomen pule castaneous 13. 



13. Space between hind ocelli distinctly greater than that between them and 



eyes; that portion of head behind the latter somewhat semielliptic in 



shape juxia Blake. 



Space between hind ocelli slightly less than that between them and eyes ; 

 head rather square behind eyes infelix D. T. 



14. Body more or less blackish 16. 



Body pale castaneous 15- 



15. Wings with a yellowish tinge, faintly margined with fuscous, a dark rounded 



cloud in middle of posterior margin of anteriors : pubescence pale; 



head evenly rounded behind nebulosa Blake. 



Wings broadly and distinctly margined with fuscous; pubescence yellowish ; 

 head square behind unicolor Cress. 



16. Entirely black-brown ; wings yellow niendica Blake. 



Not entirely dark, the black confined to thorax on sides and beneath, legs 



and first segment 17- 



17. Head, thorax and abdomen clothed with a reddish pubescence; abdomen 



entirely castaneous; scape and pedicel testaceous; flagellum black; 



wings broadly margined with fuscous antliophorte Ashm 



Head, thorax and abdomen with a pale yellowish pubescence ; first segment 

 black; antennse concolorous throughout, testaceous-fuscous: "wings 

 yellowish hyaline, clouded abi)ut the middle and apex." 



rustica Blake. 



18. Last dorsal segment distinctly margined laterally 19. 



Last dorsal segment smooth, not carinate or margined 20. 



