1914.] NATURAL SCIENCES OF PHILADELPHIA. 583 



tibiae, but in rubescens the tarsi are dark brown, concolorous with 

 the tibiae. 



Tribe Eriopterini. 



Genus ERIOPTERA Meigen. 

 1803. Erioptera Meigen; Illiger's Magaz., vol. 2, p. 262. 



Subgenus MESOCYPHONA Osten Sacken. 

 1869. Mesocy-phona Osten Sacken; Mon. Dipt. N. Am., vol. 4, p. 152. 

 Erioptera (Mesocyphona) rubia sp. n. 



Dark brownish black; wings dark brown with white spots and a 

 white cross-band at the cord. 



Female, length, 4 mm,; wing, 4.2 mm. 



Rostrmn, palpi and antennae black, flagellar segments rounded 

 oval. Head black. 



Thoracic dorsum dark brownish bjack with a sparse brown bloom, 

 the area darker in front of the pseudosutural foveae. Pleurae dark 

 brown with a sparse gray bloom. Halteres yellow, the knobs a 

 little darker. Legs, coxae and trochanters very dark brown, femora 

 dark brownish black, greatly enlarged at the tip, tibiae dark brown, 

 the tip darker, tarsi w4th the basal half of the metatarsi dull brownish 

 .yellow, remainder of the feet dark brown. Wings dark brown with 

 white marks as fohows: a large rounded spot at Sd, a smaller rounded 

 spot near the tip of 2d A, a broad white band at the cord entirely 

 traversing the wdngs, tip of the wing white including the ends of ceils 

 Rz, Ro and parts of R2 and Mi; it is probable that the base of the 

 wing is also white, but this is not certain; veins dark brown except 

 in the white markings, where they are china-white and difficult to 

 detect; venation (PI. XXVI, fig. 12). 



Abdomen dark brownish black, valves of the ovipositor brownish 

 yellow. 



Holotype, 9 , Chiricahui Mts., Cochise Co., Ariz., June 24 (H. G. 



•Hubbard). 



Erioptera (Mesocyphona) immaculata Alexander. 



1913. Erioptera {Mesocyphona) immaculata Alexander; 'Proceedings of the 

 United States National Museum, vol. 44, pp. .518, 519, pi. 66, fig. 20. 



One female from Denison, Grayson Co., Tex., June 22, 1904, 

 taken by Mr. H. S. Barber. 



Erioptera (Mesocyphona) eiseni Alexander. 



1913. Erioptera {Mesocyphona) eiseni Alexander; Proceedings of the 

 United States National Museum, vol. 44, pp. 516, 517, pi. 67, fig. 26. 



One male collected at La Cueva, Organ Mts., Donna Ana Co., 

 N. :Mex., alt., 5,300 feet, on September 1, by Prof. C. H. T. Townsend. 



