AMERICAN DIPTERA. 369 



I have no record of this species farther south than New 

 Jersey. It is very abundant here in Massachusetts and Con- 

 necticut during the latter part of July and August in pastures 

 and open fields. The species is subject to numerous small 

 variations; the thorax may not show any sign of the black 

 dorsal stripes or these may be quite distinct ; the color of the 

 abdomen may be dark, or nearly yellow. Specimens are very 

 apt to become greasy and the white spots of the sides of the 

 abdomen are then lost. 



Deromyia winthemi. 



Dasypogon winthemi Wiedemann, Dipt. Exot., 223, 1821. 



Dasypogon winthemi Wiedemann, Auss. Zw., I, .387, 1828. 



Dasypogon winthemi Schiner, Verh. Zool.-Bot. Ges., XVI, 678, 

 June, 1866. 



Diogmites misellus Loew, Cent., VII, 39, July, 1866. 



Deromyia winthemi Van der Wulp, Tijdsch. v. Ent., XXV, 93, 

 1883; XXVII (Sep.), 2; oc. in Conn., notes. 



Deromyia winthemi Williston, Trans. Am. Ent. Soc, XI, 24, 

 PI. II, fig. 6, synonomy, 1884. 



Diogmites misellus Osten Sacken, Biologia, Dipt., I, 177, 1901; 



doubts identity of misellus. 



% . ° — Length 14.5-17 mm. — A much smaller yellowish species, with 



three velvety black stripes on the thoracic dorsum, and the abdominal 



segments darker above, except on the margins, where they are pale 



yellow pruinose. 



This species is more easily recognized by its small size and the three 

 velvety black stripes on the dorsum. Face, front and occiput pale 

 golden pruinose; the antennae and palpi reddish-yellow; the proboscis 

 black, yellowish only at base below. Mystax, beard and bristles of 

 coxae whitish; hair of palpi and bristles of prothorax, first abdominal 

 segment and before the halteres reddish-yellow. Hair and bristles 

 of the thoracic dorsum black, the hair longer than usual. Thorax, 

 including the coxae, wholly light yellow pruinose, the three black dorsal 

 stripes distinctly separated from each other; the median stripe merges 

 into reddish-brown anteriorly; the black of the lateral stripes is also 

 abbreviated anteriorly and bisected at the transverse suture. The 

 segments of the abdomen, excepting all the margins, sometimes black- 

 ish-brown, sometimes hardly darker than the rest of the body, and 

 occasionally almost yellow; the margins and the venter, light golden 

 pruinose, and some specimens show traces of black spots along the 

 sides of the abdomen. Legs yellowish-red; the apices of the tibiae 

 and tarsi and all the bristles black. Wings clear hyaline, toward the 

 apex and posterior margin grayish. 



TRANS. AM. ENT. SOC, XXXV. (47) SEPTEMBER, 1909 



