ART. 9 DIPTERA FEOM AMERICA, ASIA, AND JAVA ALDRICH 19 



SCHISTOCHILUS ARISTATUM, new species 



Color black, mostly gray-pollinose. 



Male. — Frontal stripe brownish toward arista and the same color 

 extending vaguely down along the edge of the luniile. Pollen of 

 parafrontals and parafacials and posterior orbit dull gray. Palpi 

 and basal joints of antennae dark yellow. Thorax black, with gray 

 pollen, leaving two slender submedian stripes interrupted at the 

 suture, an indistinct wider interrupted outer stripe. Chaetotaxy 

 Acrostichal, 2, 4; dorsocentral, 3, 4 (the posterior may be only 3) 

 humeral, 2; notopleural, 2; posthumeral, 1 (inner); presutural, 1 

 supraalar, 2; intraalar, apparently 0; postalar, 2; sternopleural, 1, 1 

 pteropleural small. Scutellum black at base and margin. Abdomen 

 shining black, with basal gray-pollinose bands on second to fourth 

 segments, narrowed in middle on the first and covering about one- 

 third of the segment except on the fourth where in certain lights 

 the pollen extends almost to the tip ; first and second segments with- 

 out median marginals; third with a depressed pair; fourth with a 

 row at apex of varying sizes. Genitalia small, of ordinary structure, 

 the outer forceps almost as long as the inner. Wing quite distinctly 

 infuscated, the color following the veins broadly, leaving a sub- 

 hyaline spot in the middle of the apical cell and the margin irregu- 

 larly of the same color. Base of wing distinctly paler. Squama 

 white. Costal spine small but distinct. The costal segment before 

 tip of second vein about one and one-third times as long as the one 

 beyond it. Hind cross vein concave outward, joining fourth vein 

 barely beyond middle between small cross vein and bend. Legs 

 black; claws and pulvilli not at all elongated; middle tibia with a 

 single bristle on anterodorsal side and one on ventral ; hind tibia with 

 a single sparse row of bristles of varying size on anterodorsal side. 



Length, 5.8 mm. 



Ty^pe.— Male, U. S. N. M. No. 43690. 



Remarhs. — Described from three males, reared from Diatraea 

 striatalis Snellen, at Pasoeroean, Java, April, 1931, by Dr. P. C. 

 Hart, received from Dr. S. Leefmans, to whom one paratype is 

 returned. 



I am unable to find a genus more nearly related to this than 

 Atractochaeta., from which it differs markedly in having the deep 

 facial groove for the antennae, the face more receding, apical cross 

 vein more erect, and first vein bare and third with only a single 

 setule, as well as in minor characters. 



Genus ZENILLIA Robineau-Desvoidy 



Zenillia Robineau-Dbsvoidy, Essai sur les Myodaires, p. 152, 1830. — Aldbich 

 and Webbee, Proc. U. S. Nat. Mus., vol. 63, art. 17, p. 7, 1924. 



