E. T. CRESSON, JR. 39 



two apical joints of fore tarsi are white; there is only one frontal bristle. The 

 arista is rather long plumose. Length. — 3.5 mm. 



Originally described from a female from Fort Resolution, 

 Hudson Bay Territory, (Kennicott). 



The above description is based on a male from the District of 

 Columbia, July, (Coquillett), [U. S. N. M.]. I have also Ijefore 

 me a female from Beverly, Massachusetts, June 20, [U. S. N. M.], 

 which differs in several important points. It has two frontal 

 bristles; the mesonotum and scutellum are ferruginose, leaving 

 only the anterior margin of the former black. In other respects 

 it is similar to, and I think conspecific with, the male. I found 

 these two specimens in the National Museum lalielled as *S. 

 apicafa, probably determined by Coquillett. 



Dichrochira pleuralis new species 



Suggesting my determination of glabricula excepting for the 

 tarsal character and in having only one frontal bristle. On the 

 other hand very similar to apicatn as herein described, but more 

 shining and the pleura entirely black. 



(J'. Thorax, including the pleura, pectus, and metanotum black, shining to 

 polished, with a cinereous dusted area on sternopleura. Only one frontal 

 bristle present. Cheeks linear. Only the apical joint of fore tarsi pale. 

 Wings not infuscated along the veins. Length. — 3 mm. 



Type. — cf; Swarthmore, Delaware County, Pennsylvania, 

 July 25, 1909, (E. T. Cresson, Jr.), [A. N. S. P. no. 6220]. 



Dichrochira albicaleeata new species (PL II, fig. 23.) 



A distinct species, apparently similar to D. oldenhergi Hendel of 

 Europe. Easily recognized Ity the black third antennal joint, 

 face and palpi. 



9. Black; shining. Anterior margin of frons, sides of face, cheeks, lower 

 occiput, antennae except the black third joint, proboscis except the black 

 palpi, pleura, halteres, base of abdomen laterally, legs excepting the black 

 apices of fore femora, fore tibiae and two basal joints of fore tarsi, yellow. 

 jNotopleura and a broad upper pleural stripe, tawny; metapleura black; 

 fore coxae, apical three joints of fore tarsi, white; squamae and cilia pale 

 yellow. Wings brownish with faint infuscation along veins. Notopleura 

 and mesonotum more or less gray; fore coxae and sides of face silvery. Frons 

 with two frontal bristles, the anterior one weak; arista long plumose. Length. 

 — 4 mm. 



Type. — 9 ; Boston, Massachusetts, July 4, 1911, (C. W. John- 

 son), [B. S. N. H.]. 



TRANS. AJVI. ENT. SOC, XLVI. 



