234 A. L. MELANDER. 



The European precatoria Fallen and Walker's albipes are inclu- 

 ded in the table as from North America on Walker's authority. 

 The position of albipes was determined from a hint of Dr. Williston, 

 that it is associated with precatoria, and therefore belongs to the 

 group Mantipeza. 



Anal and discal cells present (Mantipeza Rondani) 10. 



Discal cell united with one of the other cells 2. 



2. Anal cell wanting (IMicrodromia Bigot) 6. 



Anal cell present 3. 



3. Second basal emitting three veins (Bleoplasta Coquillett) 4. 



Second basal with two veins, one forked- . .(Hemeroclroiuia Meigen) 5. 



4. Filaments of hypopygium hidden scapularis Loew. "f 



Filaments of hypopygium exposed iuexicana sp. nov. 



5. Thorax and abdomen red derecta Loew.v'^ 



Thorax and abdomen black COllusor sp. nov. ■• 



6. Thorax partly red 7. 



Thorax wholly black 9. 



7. Femora with a spine-tipped tubercle at base beneath 8. 



Femora with no such prominent tubercle empiformis Say.v' 



8. Thorax vittate snperstitiosa Say. 



Thorax wholly red rogatoris Coquillett. •/ 



9. Front femora longer than the coxae defessa Williston. 



Front femora shorter than the coxae captus Coquillett. 



10. Wings wholly clear 11. 



Wings with at least a brownish stigma 12. 



11. Body uniformly fulvous to black albipes Walker. 



Thorax reddish in greater part 14. 



12. Stigma black iiotala Loew. 



Stigma fuscous 13. 



13. Body cinereous Talida Loew. 



Body light yellow, thorax brownish praecatoria Fallen. 



14. Thorax darker at the margins, scutellum dark obMOleta Loew. 



Thorax lighter at the margins, scutellum light pailoris Coquillett. 



Hemerodroniia scapularis Loew (Fig. 59). 

 (Jent., ii, 54. 



Black, shining, humeri either testaceous or fuscous, rarely black, abdomen of 

 male often nearly all black, sometimes the basal segments whitish ; abdomen of 

 the female white, black at apex, the ovipositor yellowish, its base and apex 

 broadly black. Antennae, proboscis, halteres and legs white. Wings hyaline, 

 no stigma, second vein short. 3 mm. 



Maryland, Maine, Pennsylvania, Tennessee, Wyoming. 

 The sixth vein is sometimes wanting. 



This species was taken in company with Hemerodromia collusor. 

 Three males, ten females. 



