550 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 66. 



STURM lODEXIA RUBESCENS, new species. 



Length, 9.5 to 10 mm. Four males, Yahuarmayo, Rio Inambari, 

 Peru,, 1,700 feet, February 9, 1910 (C. H. T. Townsend). 



Brown to brownish-rufous, cinereous poUinose. Antennae and 

 palpi light brownish-fulvous. Head with yellowish tinge to the 

 pollen. FrontaUa brown. Thorax and scutellum bro\\Ti, silvery 

 poUinose with slight brassy tinge; four black thoracic vittae, inner 

 pair narrower and shorter, outer not interrupted Abdomen brownish- 

 rufous, last three segments changeably poUinose, with tawny tinge 

 to pollen which shows golden to cupreous shades in varying Ught. 

 Legs brown. Wings smoky costobasaUy and along veins. Tegulae 

 lightly yellowish-smoky. 



Type.— Cut. No. 22233, U.S.N.M. 



LEPTODEXIA, new genus. 



Genotype. — Leptodexia gracilis, new species. 



General Calirrhoine characters. Facial carina nearly obsolete. 

 Epistoma short, wide, strongly warped. Proboscis about one and 

 one-half times head height. Palpi slender, hardly as long as third 

 antennal joint, thickened some at tip. Third antennal joint about 

 three times second. Arista thinly long-plumose to tip. Ocellars 

 present, weaker in female. ParafacUia bare. Two sternopleurals 

 and lateral scuteUars; three postsuturals; no preacrostichals ; one 

 postintraalar; one very weak postacrostichal; weak divergent apical 

 scuteUar pair. Wings long, narrow, equilateral. Apical ceU open 

 almost in tip. Legs long; tarsi elongate in both sexes; male claws 

 long. Median marginal pair on first segment in male but not in 

 female, on intermediate segments in both sexes and tending to 

 marginal row on third; marginal row on anal. 



LEPTODEXIA GRACILIS, new species. 



Length, 5 to 6 mm. One male and one female, Huascaray Ridge, 

 Jaen Province, Peru, 7,000 feet, September 21 and 22, 1911 (C. H. T. 

 Townsend). 



BroAvn to blackish, cinereous to pale golden poUinose. Palpi 

 fulvous, more or less fuscous apicaUy. Antennae black. FrontaUa 

 soft brown with coppery reflection. Rest of head sUvery, with faint 

 golden tinge in places. Thorax and abdomen rather thickly poUirose, 

 with decided golden tinge; leaving three thoracic vittae, the middle 

 one over twice as wide as the outer ones and reaching to tip of scu- 

 tellum, the outer ones broadly interrupted at suture and sharply 

 pointed behind; four large blackish triangles on abdomen, one on 

 each segment. Wings and tegulae faintly smoky-yeUowish. 



Type.— Co-t No. 222.^7. U.S.N.M. 



