17-i INSECUTOR INSCITI^ MENSTRUUS 



Nephochaetona, new genus. 



Genotype, Nephochaetona mima, new species. 



Clypeus slightly depressed, epistoma slightly warped. Arista 

 long, microscopically pubescent, thickened on basal fourth. 

 Facialia bare, as wide as parafacialia, narrowing upward ; the 

 parafacialia bare and narrowing downward. Eyes thinly hairy. 

 Frontals stopping at base of antennae. Wings clouded, apical 

 cell open a little before tip, third vein bristled to beyond small 

 crossvein, hind crossvein in middle between small crossvein and 

 cubitus. Macrochaetae erect. Palpi swollen and nude apically. 



Nephochaetona mima, new species. 



Length, G mm. One female, Huascaray Ridge, Jaen Prov- 

 ince, Peru, 7,000 feet, September 21, 191] (C. H. T. Towns- 

 end). Taken in company with specimens of an anthomyiid, 

 which it counterfeits not only in wing clouds but also in facial 

 and frontal characters. 



Dark brown, slate-gray pollinose. Palpi very pale fulvous. 

 Basal half of antennae light rufous. Frontalia black. Four 

 thoracic vittae, the outer ones heavier. First three abdominal 

 segments more or less shining blackish on disk. Tibiae pale 

 fulvous. Tegulae glassy clear. Wings clear, with clouds on 

 stigma, hind crossvein, apical crossvein, and end of second 

 vein, the last two more or less confluent. 



Erythromelana, new genus. 



Genotype, Erythromelana jaena^ new species. 



Allied to Thelaira. Eyes thinly hairy, descending a little 

 short of epistomal level. Frontals diverging two bristles be- 

 low base of antennae. No ocellars. Male vertex rather over 

 one-sixth of head width, that of female but little wider. Only 

 one vertical in both sexes. Male without, female with two 

 proclinate orbitals ; both sexes with two reclinate orbitals. Two 

 sternopleurals and two postsuturals. Apical cell open a little 

 before tip. Both sexes with a median marginal pair on first 

 two segments and marginal row on last two segments ; no 

 median discals. 



