358 ERNEST A. BACK. 



There are three other specimens, two belonging to the Na- 

 tional Museum and one to Prof. J. M. Aldrich, from Florida 

 which are between 30-33 mm. long, and may be bigoti, although 

 I believe them distinct from the above-mentioned specimens. 

 They also are very robust specimens ; on each of segments 2-5 

 is a broad blackish cross band, in one specimen interrupted 

 in the center, the anterior and posterior margins being narrowly 

 reddish and the posterior angles light golden pruinose. They 

 look much like very large specimens of refuscens. 



Deromyia discolor. 



Diogmites discolor Loew, Cent., VII, 37, 1866. 



Deromyia discolor Williston, Tr. Am. Ent. Soc, XI, 25, oc. in Pa. 



? Dasypogon basilis Walker, Dipt. Saund., 95, 1856. 

 $ 9- — Length 17-22 mm. — Reddish-yellow; dorsum o£ thorax with 

 two very narrow median stripes; abdomen narrow, that of the male, 

 excepting the white pruinose posterior angles and lateral margins of 

 the several segments, almost wholly black; that of the female yellow- 

 ish-red, with small black spots in front of the white pruinose posterior 

 angles; wings yellowish hyaline, toward the apex and posterior mar- 

 gin brownish. 



9 . — Head and thorax reddish-yellow, the face and front with a 

 densely whitish-yellow bloom; occiput golden-brown pruinose except 

 on the extreme orbits Antennae reddish-yellow; palpi black or brown- 

 ish-black. Bristles of the antenna?, front, occiput and palpi black ; 

 those of the last two often tawny; mystax sordid white. Dorsum of 

 thorax with two narrow velvety black median stripes, much abbre- 

 viated behind; lateral stripes indistinctly defined, dark brown; the 

 humeri and a broad stripe extending backward along the lateral mar- 

 gins and including the scutellum, and the pleurae and coxae, golden 

 pruinose. Hair and bristles of dorsum and the trichostical bristles, 

 black; the latter proportionately short. Bristles of coxas pale. Ab- 

 domen narrow, for the most part black, except on the distal portion 

 of the first segment and the anterior portion of the second, where it is 

 reddish ; segments 2-5 with their lateral margins and posterior angles 

 white pruinose, on segments 2-4 the white bloom nearly meeting to 

 form a cross-band over the tergum; abdomen everywhere with short 

 black hair, except on the hypopygium, where it is longer. Wings 

 yellowish-hyaline, the greater part of the marginal and first submar- 

 ginal, the outer half of the first posterior, and the whole of the second 

 submarginal, the second and third posterior cells, and a triangular 

 area in the outer part of the fourth and fifth posterior cells, and a 

 trace along the margin of the axillary cell brownish. 



