NOKl'H AMERICAN DIPTKRA. 95 



the Colorado Desert, in what was formerly San Diego, but is now 

 Riverside, County- 



ARGVKAMCEBA Scbiner. 



Argyramoeba antecedens Walker is a synonym of ^4. Umatulus Say, 

 and A. obsoleta Loew is synonymous with A. a/bofasciata Macq. A. 

 albosparsa Bigot (Ann. Soc. Ent. France, Ixi, 348) appears to be the 

 same as A. argyropyfja Wied. 



The following table contains all the species at present known to 

 occur in this country north of Mexico: 



1. — Costal cell unicoloroiis, never distinctly checkered 2. 



Costal cell checkered hyaline and black, wings containing more than fifteen 



black spots eedipus Fabr. 



2. — Wings largely hyaline 3. 



Wings wholly black <'«*|»lnis Fabr. 



3. — Hyaline portion of wings containing black spots 13. 



Hyaline portion of wings destitute of black spots; base of wings black, the 



apical portion hyaline 4. 



4. — Brown of wings reaches apex of first submarginal cell 6. 



Brown of wings does not reach ape.\ of first submarginal cell 5. 



5. — Anal and axillary cells largely or wholly black 15. 



Anal and axillary cells largely hyaline Tlir O. S. 



6.— Anal cell largely or wholly black, legs black arj;yroi>y$;a Wied. 



Anal and axillary cells largely hyaline, legs yellowish. ..succiiicta. n. sp. 

 7. — Wings destitute of black spots beyond base of second submarginal cell. ...8. 

 Wings marked with one or more black spots beyond base of second submar- 

 ginal cell 12. 



8. — Second basal cell largely or wholly brown, a large brown spot at base of 



secotid submarginal cell 9. 



Second basal cell, except its base and apex, hyaliiie 10. 



9. — With a large brown spot at base of second posteriorcell...liiiiatiilus Say. 



With at the most only a trace of such a spot aIbol'M»ici»ta' Macq. 



10. — Anal cell with a brown spot near its middle, a large one at bases of second 



submarginal and second posterior cells vari» Fabr. 



Anal cell destitute of a brown spot near its middle 11. 



11. — Tonientum of abdomen wholly white and yellow dapliiie O. S. 



Tomentum of abdomen largely black pauper Loew. 



12. — With only one black spot beyond base of second submarginal cell. 



cybele n. sp. 



With at least two black spots beyond base of this cell... ^ iji.|«Q Wied 



13. — Wings containing fifteen black spots Ilielaiiopogou Big. 



Wings containing less than fifteen black spots 14. 



14. — Third posterior cell never bisected by a cross-vein 7. 



Third posterior cell bisected by a cross-vein; length of body 14 mm. and 



( siiiiKOii Fabr. 



"^'^'' Idelila Loew. 



15. --Pile of front end of thorax and of breast black aiiailis Say. 



Pile of front end of thorax and of breast white gidt'Oii Fabr. 



TEANS. AM. ENT. SOC. XXI. MARCH. 1894. 



