68 williston: new diptera. 



Orthcncuromyia mod est a, n. sp. 



Male. Black throughout, the pulvilli and lialteres alone yellow. 

 Front a little shining in the middle, thinly grayish-brownish dusted. 

 Face rather thickly gray dusted, somewhat shining in the middle; pile 

 and mystax white. Dorsum of thorax shining, but mostly concealed 

 beneath golden pubescence. Pleurae densely white pollinose, with 

 two shining spots, the one on the mesopleur^e, the other in front of the 

 metapleurai. First five segments of the abdomen with a small silvery 

 spot on the hind angles; elsewhere shining; sixth segment a little 

 longer than the fifth, gradually tapering. 



Length. 7-8 mm. 



One specimen, Smithville, South Dakota (J. M. Aldrich). 



Asilus Novae Scotiae. 



AxiliDi JS'oriie Sciitiiie Macijuart, Dipt. Exot.. 2 Siippl., 46. 

 Male, female. Face thickly covered with silvery pollen, on the 

 gibbosity with sparse black and white bristles; in profile the gibbosity 

 not strongly projecting, extending not quite to the middle of the face. 

 Antennae black, the third joint about as long as the first two together, 

 or z little shorter, the bristle as long as the joint. Front more 

 ochraceous pollinose. and, as also the first two joints of the antennae, 

 with black hair. Beard silky white. Thorax densely gray pollinose, 

 the dorsum ochraceous, leaving two median, narrowly separated, 

 dark brown stripes, and two spots on each side, one in front, the 

 other behind the suture; hair of the dorsum short, sparse, black, the 

 bristles long and moderately strong, also black; on the border of the 

 scutellum with two approximated bristles. Abdomen light ochraceous 

 pollinose on the sides and posterior margins, apparent when seen from 

 above, elsewhere more brownish pollinose, but variable in different 

 lights; when seen from behind more shining blackish brown; hair 

 short, sparse, light colored on the sides of the segments; in front of 

 the hind borders, with short white bristles. Legs black, with close- 

 lying, white hair and long black bristles; all the tibiae and metatarsi, 

 except their immediate tip, and the immediate base of the other tarsal 

 joints light yellow; front tibiae, on the outer side, with several 

 conspicuously long bristles; on the inner side with a brownish or 

 blackish stripe, not reaching the base. Wings hyaline; the outer end 

 and the posterior side, reaching as far as the anal cell, but only 

 including its hind border, lightly tinged with blackish. 



Length, 15-19 mm. 



Twelve specimens, Connecticut. 



Asilus sericeus. 



Axil'i'? sfrlreu--< Say, J., Acad. Phil, iii, 48, 2; Compl. Wr., ii, 6.3; Wiedemann, 



