NEW MUSCOID FUES FROM THE ANDEAN MONT AN YA 185 



Tribe LARVAEVORINI 



Peleteria robusta marmorata, new subspecies. 



Length of body, 8.5 to 1 1 mm. ; of wing, 6 to 8.5 mm. Chosica, 

 about 2,700 to 3,000 feet, six males and three females, July 21,1912, 

 on flowers of Asclepias curasscmica ; five females and two males. May 

 8 and 9, 1 9 1 3, on flowers of Mikania sp. 



Head very pale golden pollinose, the occiput and parafrontcJs with 

 dark ground color showing through, the rest with light ground color, the 

 facial plate more silvery. Frontalia light to dark fulvous, lunula and first 

 two antennaJ joints fulvous to rufous, third joint and arista brown except 

 sometimes base of former. Palpi brownish-yellow. Occipital pile pale 

 golden ; cheek, parafacial, and frontal pile black. Humeri concolorous 

 with peirafrontals. Rest of thoracic scutum and scutellum shining blackish 

 with a faint greenish tinge, very thinly covered with a grayish or silvery 

 pollen, the usu£j vittae very indistinct. Sometimes the scutellum is slightly 

 rufous apically. Abdomen showing a marmorate effect, the anal segment 

 wholly rufous in femeJe but often largely blackish in made, with pale 

 golden pollen ; other segments wholly shining black, covered with a thin 

 silvery-white or bluish-white coat. Legs black, the front femora faintly 

 golden to silvery pollinose on outside. Wings faintly infuscate, both 

 scales of tegulae white. 



Closely allied to P. robusta Wd., from which it differs principally in 

 the decidedly dcirker coloration of parafrontals, scutellum, and wings, and 

 is quite certainly only a subspecies thereof. Belongs in Peleteria as 

 restricted, on following characters : Eyes bare, parafacials hairy, two facio- 

 orbital bristles, second antennal joint longer than third, first aristal joint 

 elongate, both sexes with orbital bristles, palpi long and filiform, no ocellar 

 bristles, third antennal joint strongly convex on front edge, front tarsi of 

 female conspicuously widened, first abdominal segment with no median 

 macrochaetae but second with median marginal pair. 



Pseiidoarchytas, new genus. 



Differs from Archytas in second antennal joint being longer than third ; 

 third joint not strongly convex on front edge, the front and hind edges 

 being practically same ; palpi more club-shaped, not so flattened apically ; 

 arista proportionately much shorter ; front tarsi of the female hardly wider 

 than the others. The first aristal joint is not elongate, the eyes are bare, 

 parafacials hairy. No facio-orbital bristles, female with orbital bristles 



