312 ENTOMOLOGICAL NEWS [xxxil, '21 



other characters upon which to separate them. In my material, 

 which is all from Illinois and all collected by myself since 

 1915, I find three species, two of which 1 assume to be those 

 described by Loew. Several of the specimens taken were 

 attracted evidently by perspiration and were very persistent in 

 their efforts to settle on my hands and face. 



Key to Species. 



1. Male with some very long yellow bristles on basal half of postero- 

 ventral surface of hind femur, the longest of which are longer thaiv 

 the diameter of femur: color of both sexes usually deep black; 

 humeral and pleural spots milk-white and conspicuous; bristles of 

 thorax yellowish, in male conspicuously so ; f rons in male usually 

 slightly silvery and more or less whitish anteriorly, .humcralis Loew 



Male without bristles as above; species brownish or yellowish, with or 

 without conspicuous white humeral and pleural spots ; f rons not 

 silvery 2 



2. Face, humeri, and pleurae with milk-white spots. ... Icucosioma Loew 

 Face, humeri, and pleurae without milk-white spots, but little paler 

 than the surrounding areas minor sp. n. 



Phortica minor sp. n. 



$ , Yellowish brown, slightly shining, legs slightly paler. Humeri 

 and the pleural area occupied by the whits spot in other species paler 

 than the surrounding areas but inconspicuously so. 



Structurally similar to lencostoma, differing in being 2 mm. in length, 

 whereas leucostoma is 3 mm. 



Type, Dubois, Illinois, June 5, 1920. Two paratypes, same 

 locality, August 12, 1920, and June 3. 1919. Types in the col- 

 lection of the State Natural History Survey, Urbana, Illinois. 



MICRODROSOPHILA gen. n. 



Generic characters: Similar to Drosophila in structure. Dif- 

 fers from that genus in having each orbit with two strong 

 bristles, the outer one directed forward and placed a little 

 anterior to the inner, which is backwardly directed ; the meso- 

 notum with two pairs of dorso-centrals, one pair a little proxi- 

 mad of the middle and the other near posterior margin ; only 

 one humeral bristle ; basal pair of scutellars much weaker than 

 apical pair, the latter not cruciate ; costal setulae continued 

 almost or quite to apex of third vein. 

 (rcnotypc, Drosophila qnadrata Sturtevant. 



Sturtevant records this species from Alabama, Georgia, and 

 Indiana. 1 took two specimens on windows in the Natural 

 History Building of the University of Illinois, June 13 and 

 August 4, 1915. 



