224 KANSAS UNIVERSITY QUARTERLY. i 



erad the transfrontals on the geno-vertical plate are a good many j 

 exceedingly tiny, scattered hairs. The great ocellar bristles 

 are large, and normal in direction. There are about four small 

 pairs of lesser ocellars. The postverticals are large ( about half 

 as large as the inner verticals ) and are not clearly members of j 

 the ocellar group; they are distinctly divergent. The inner I 

 and outer verticals are large. The occipito-centrals and occipito- 

 laterals are both present. The cilia of the posterior orbit and 

 the bristles on the occiput are as in the male. The eye of the | 

 female is less distinctly hairy than that of the male. ' 



The ground color of the thorax is shining black, but it has " 

 several gray pollinose stripes and patches, and the meso-pleura, 

 steruo-pleura and scutellum are quite uniformly but thinly 

 gray pollinose. The distinctness of the stripes and patches j 

 varies in diiferent individuals, and also according to the inci- i 

 dence of the light. They are as follows : (1) A broad median 

 stripe. (2) A broad stripe on each side in the line of the dorso- 

 centrals ; both this and the former are most distinct cephalad '. 

 the suture, and near the scutellum become broader and fainter ' 

 and fuse with one another. (3) One on each side caudad the , 

 suture in the line of the intra-alars. There are also rather thick 

 patches covering the humeri, and thin patches extending from '■ 

 the humeri to the roots of the wings. 



The halteres are yellow or yellowish brown. j 



The squamulse are almost hyaline, in some specimens with ! 

 a faint yellowish-brown tinge and a distinctly yellow brown 

 border. 



The chietotaxy of the thorax is shown in figure 12. The j 

 second intra-alar is absent in both males and in one female, ■ 

 perhaps broken off, but I can see no scar. The supra-alars are 

 unusual ; the cephalic one is small, often so small as to be , 

 little or not at all distinguishable from the microchnetiP ; the ' 

 caudal one varies in size, but is always distinct. The most I 

 dorsal humeral varies in size, always much smaller than the . 

 others ; it is sometimes a mere hair. i 



The abdomen has a shining black ground color with a uni- i 

 form coating of brown pollen, which is much thicker in the i 

 male than in the female, and in the female is thickest on the j 

 fourth segment. On each segment of the male there are margi- j 

 nal microch?etce, which are largely toward the sides of the ! 



