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U.S. NATIONAL MUSEUM BULLETIN 2 68 



light ridges extending laterally from the medial groove; mesosternal 

 tubercles absent; legs ferruginous; wings subhyaHne except for a 

 darker area apicaUy along the anterior border, second submarginal 

 cell petiolate. 



Abdomen black with limited ferruginous except for broad bands 

 more or less emarginate on terga 1 to 5 and sterna 3 and 4, and small 

 lateral spots on sternum 2, all of which are Hght yellow; ferruginous 

 largely replaces the black on the 1st tergum, the 1st and 2nd sterna and the 

 entire 6th segment; pygidium with sides slightly convex converging 

 to a rounded apex. 



Two specimens of females of E. melanovittata Scullen have been recog- 

 nized. The above description is based largely on one taken at Willcox, 



Figure 23. Southwestern U.S. 

 melanovittata Scullen 



E. 



Cochise County, Ariz., July 7, 1956 (A. D. Telford). Another specimen 

 was taken at Davis Mts., Jeff Davis County, Tex., Sept. 4, 1949 (F. 

 Werner and W. Nutting). The latter specimen has markings much 

 lighter than the former and the ferruginous area is very limited on 

 the body parts. Males taken from each of the above localities show 

 similar color variations. Most of the males examined show no fer- 

 ruginous. Future collections may show it desirable to recognize two 

 subspecies based on the extent of the ferruginous markings. 



Two males taken 40 mi. W. of Linares, N. L. Mexico, have the 

 legs very dark and the body parts also darker than the typical form. 

 Further collections may show it desirable to recognize this color form 

 as a distinct subspecies also. 



Type. — The holotype male of E. melanovittata Scullen is at the 

 California Academy of Sciences. It was taken 25 mi. E. of El Paso, 

 Tex., July 13, 1942 (E. C. Van Dyke). 



