346 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



Cal., and another, exactly similar, from Colorado Springs (Uhler). Be- 

 fore describing this species, it will be necessary to compare it to the 

 original specimens of T. Solaris and actinobola. Trypeta femoralis Thom- 

 son (Eug. Resa, 582) is an Urellia, and may be only a variety of my 

 species. 



Trypeta (Tephritis) finalis Loew, Monogr., iii, 296, tab. xi, f. 4 

 (California and Texas). — Very common about Lake Tahoe and Webber 

 Lake, Cal. (July 18-22), on Wyettia mollis, a Composite, which is evi- 

 dently its food-plant. 



Trypeta (Acidia) faust A n. sp., $ 9.— Black; head, lateral stripes 

 of thorax, scutellum, tibise, and tarsi yellowish or yellow ; wings nearly 

 like those of A. fratria (Monographs of North American Diptera, iii, 

 tab. x, f. 4), but their proximal third hyaline with a narrow black cross- 

 band. Length 4-5 mm . 



Face, palpi, proboscis, and occipital orbit pale yellow ; antennae and 

 lower portion of front orange-yellow ; sides of front pale yellow, its 

 upper portion ferruginous yellow, grayish-pollinose; occiput blackish. 

 Thorax black; dorsum clothed with a short golden-yellow pubescence and 

 a grayish pollen, forming two broad stripes; the longer bristles are 

 black ; a yellow stripe between the humerus and the root of the wing ; 

 scutellum pure yellow. Abdomen black, with black hairs. Legs : 

 coxae blackish, yellowish at the tip ; trochanters clay-yellowish ; femora 

 black, their tip clay-yellowish ; tibiae and tarsi clay-yellowish. Hal teres 

 yellowish. The base of the wings is as in A. suavis, the apical portion 

 like that of A. fratria (Monographs, etc., vol. iii, tab. x, fig. 10, and f. 

 4). The basal third of the wing is hyaline, tinged with yellow at the 

 root and on the veins, and with a narrow black cross-band, beginning at 

 the humeral cross vein and ending on the sixth longitudinal vein (see 

 fig. 10); the black color begins exactly where it does in fig. 10, and in- 

 closes a hyaline triangle reaching from the costato the interval between 

 the third and* fourth veins; a hyaline spot is inclosed by the black on 

 the distal part of the discal cell (as in fig. 4, only smaller); the black re- 

 gion emits a cross band toward the posterior border, parallel to the black 

 border, running along the apical portion of the costa (as in fig. 4); the 

 sinus between that cross-band and the black costal border is less deep 

 than in fig. 4, and only reaches the third vein ; sometimes it is sur- 

 mounted by a small hyaline dot. The distance between the two cross- 

 veins is as in fig. 10,— that is, the small cross vein is about the middle 

 of the discal cell ; the anal cell is not drawn out in a point at all. 



Mab. — Mount Washington, alpine region (George Dimmock). A male 

 and a female. X\ 



Trypeta (CEdaspis) prnelope, '$ ?. — Reddish-yellow; upper side 

 of thorax black, clothed with short, coarse, yellowish bristles ; scutellum 

 and metathorax black, shining; wiugs with three brownish cross-bands ; 

 cross-veins very approximate. Length about 4 mm . 



Head and antennae reddish-yellow ; cheeks pale yellow ; thorax black 



