450 KANSAS UNIVERSITY SCIENCE BULLETIN. 



the wing around to the third posterior cell, and containing a 

 small yellow dot just after tip of second vein, a narrow hyaline 

 Streak along apex of wing, three hyaline spots on border of 

 wing in second posterior cell, and three in third posterior cell, 

 from here to anal angle the wing border consists of an alterna- 

 tion of indistinct brown and hyaline spots ; otherwise the wing 

 resembles very much that of /. circinata Loew. Length, 4.5 mm. 

 Numerous specimens ; Bill Williams Fork, Arizona. Col- 

 lected by Dr. F. H. Snow. 



URELLIA. 



TABLE TO THE SPECIES. 



1. Scutellum with two bristles 2 



Scutellum with four bristles 11 



2. Basal half of wing with faded, but regular, reticulations, which consist 



principally of short, parallel streaks crossing the cells fiava, n. sp. 



Basal half not so marked 3 



3. The rays on anterior side of large wing spot fused conjuncta, n. sp. 



These rays not fused 4 



■4. The Y-shaped mark at apex of wing absent or imperfect 5 



The Y-shaped mark present 7 



5. The anterior branch of the Y-shaped mark present nigrieornis Coq. 



The anterior branch absent or represented by a dot 6 



6. Middle femora without bristles Imperfecta Coq. 



Middle femora with four or five bristles below femoralis Thom. 



radifera Coq. 



7. Small crosB-vein surrounded by the brown color 8 



Small cross-vein partly or wholly surrounded by hyaline 10 



8. Fifth vein with a grayish brown spot or streak 9 



Fifth vein without any marking biseiosa Coq. 



9. Two rays in apex of discal cell occidentalis, n. sp. 



Only one ray in apex of discal cell vicina Wulp. 



10. Fifth ray with a small dot near center of discal cell actinohola Loew. 



Fifth ray without such dot mevarna Walk. 



11. Basal half of wing with regular reticulations of short parallel streaks 



across the cells nhstetsa Loew. 



Basal half not so marked 12 



12. Apex of discal cell with one ray eugenia Wulp. 



Apex of discal cell with more than one ray 13 



13. Third posterior cell wholly hyaline poly dona Loew 



Third posterior cell with markings 14 



14. Third vein with bristles aldrichii Doane. 



Third vein without bristles 15 



15. Third posterior cell with three rays paoifica Doane. 



Third posterior cell with two rays stigmatica, Coq. 



