NEW MUSCOID FLIES FROM THE ANDEAN MONT AN YA 91 



This remarkable and most interesting genus subdivides into two well- 

 marked subgenera, as follows : 



Subgenus A. — Third antennal joint shorter than the very elongate 

 second, truncate at tip. Proboscis elongate and slender, the part below 

 geniculation normally longer than head-height. Head very elongate, the 

 face short, the plane of epistoma at right angle to that of clypeus ; para- 

 facials as wide as or wider than long. Usually four sternopleuraJs, three 

 to five postsuturals. Type, E. alpina. 



Distribution : Lake Junin (14,000 feet) to Pachacayo (I 2,000 feet). 



Subgenus B. — Third antennal joint as long as or longer than second, 

 rounded at tip ; second joint not nearly so elongate. Proboscis shorter 

 and stouter, the part below geniculation conspicuously shorter than head- 

 height. Head shorter, the face proportionately longer, plane of epistoma 

 at obtuse angle to that of clypeus ; parafacials longer than wide. Usually 

 only three stemopleurals, three to four postsuturals. Type, E. melanica, 

 new species. This subgenus also includes E. atypica, new species. 



Distribution: Pachacayo (12,000 feet). 



I forbear to name subgenera in these flies, as the multiplication of 

 names would be only confusing. They are better designated by letters. 



Echinopyrrhosia alpina, new species. 



Length of body, 15 to 17 mm. ; of wing, 1 2 to 14 mm. Several 

 females taken at Pachacayo, 12,000 feet, March 26 to 28, 1913, on 

 flowers of £^upa/onum-like and Viguiera-\^e composites. One female, 

 Oroya, 12,250 feet, March 7, 1913, on rock. Hundreds of females 

 taken by Mr. R. H. Beck at Lake Junin, 14,000 feet, March 12 to 19, 

 1913, semidormant under eaves of house during cold wet weather. 



Head dull to pale old-gold jwllinose ; frontalia, first two antennal joints, 

 palpi, and legs reddish ; third antennal joint and arista blackish. Occip- 

 ital pile yellow-gray to brassy. Thorax dark, thinly pollinose, with four 

 velvety vittae, the middle pair behind suture widened and abbreviated, 

 the outer pair widely broken by suture into two wedgelike markings. 

 Scutellum of an obscure reddish, almost light brown. Abdomen rich 

 brown, with a pair of transversely elongate subbrassy pollinose spots on 

 third and anal segments, between which is a less marked median pollinose 

 vitta, that of anal segment narrower. Venter broadly reddish. Pulvilli 

 pale yellowish, claws except tip yellowish. Wings only faintly infuscate, 



