INSECUTOR INSCITI/E MENSTRUUS 125 



Head silvery-white burnished. Mesoscutum burnished 

 silvery-blue. Antennse brown or black. Palpi rufous. 

 Cheeks with a bluish-silvery pollen. Pleurae bluish-silvery. 

 Lateral edges of postsutural mesoscutum blackish. Scutel- 

 lum blackish, with chocolate pollen, showing slightly 

 bluish on edges. Abdomen rufous throughout, almost 

 orange-red, only the median triangle of first segment and 

 median vitta of second segment dark brown. A faint brown 

 median vitta on third segment, but only the faintest trace of 

 one on anal segment. Legs brown to blackish. Wings lightly 

 fuscous, costal border more deeply tinged, anal angle less so. 

 Tegul^ deep shining translucent-fulvous, the front angle of 

 lower scale whitish ; upper scale glassy, transparent. 



Holotype, Cat. No. 20797, U. S. Nat. Mus. 



Hemiargyra hauscaraya, new species. 



Length of body, 7 to 9 mm. ; of wing, 6.5 to 8 mm. Five 

 males. Huascaray Ridge, Province of Jaen, Peru, 7,000 feet, 

 September 21, 1911 (Townsend). 



Differs from H. nigra T. as follows : Front broader ; f ron- 

 talia narrower, their width in middle being one-fourth to one- 

 third of one paraf rental. Only one reclinate orbital bristle. 

 Outer vertical bristle much stronger, well developed. Scutel- 

 lum wholly black. Abdomen black, with thin coat of silvery 

 pollen which is accentuated only on narrow bases of last three 

 segments, is thinnest on sides of posterior portion of segments, 

 and has a yellowish luster, especially on anal segment. A deeper 

 yellowish luster of pollen can be seen also as a very thin layer 

 on mesoscutum and scutellum in very oblique view. Tegulse 

 smoky-fulvous, translucent. 



Holotype, Cat. No. 20798, U. S. Nat. Mus. 



Xiphomyia, new genus. 



Genotype, Xiphomyia gladiatrix, new species. 



Differs from Spathimyia as follows : Female. Body and 

 head wider. No ocellar bristles, only fine hairs in their stead. 

 Facialia bare. Eyes bare. Palpi much enlarged apically, club- 

 spatulate Face widening at a greater angle than front. Fron- 



