146 KANSAS UNIVERSITY QUARTERLY. 



5. Abdomen black, immaculate vclutina. 



Abdomen black, segments two to five with anterior angles 



cinereous ohscura. 



6. Distal end of discal cell nearly touching border of wing, cinerea. 



Distal end of discal cell far from border of wing. . .cgregia. 



Platypeza calceata n, sp.— PL 12, figs. 1 and 8. 



Male. Cinereous. Head concolorous; antenna, probocsis and 

 palpi yellow, third joint of former infuscate distally, arista black; 

 sides of face, cheeks, and vertex with glistening yellowish pile, 

 turning to red near ocelli. Thorax with four dark brown stripes, 

 the median pair contiguous, the outside pair abbreviated anteriorly, 

 as broad as the middle ones together. Scutellum on disk a little 

 brownish, on posterior border with about eight strong black bristles. 

 Abdomen yellowish-brown; first segment obscurely yellowish, a little 

 black on sides posteriorly and brightly yellow on sides in front; 

 second, third and fourth segments yellowish-brown, with a black or 

 fuscous-black ±-shaped spot in center of each, the cross bar of which 

 lies along the incisure and is often deeper black than the upright; 

 sometimes the black extends along the anterior border of the segment, 

 thus: I; often the black of the upright broadens out posteriorly; 

 segments five and six cinereo-fuscous; sides of abdomen with long 

 silky whitish pile, turning to red posteriorly; the narrow ventral 

 surface orange-yellow, more whitish basally. Legs yellowish; hind 

 femora on outer side fuscous, except extreme tip and basal third, on 

 inner side subinfuscate distally and with shining black stripe extend- 

 ing from the tip for about a third the length of femora; hind tarsal 

 joints wonderfully enlarged and grotesquely developed (PI. 12, fig. i); 

 first joint transverse on upper side, with a long setaceous black 

 appendage ending in a round flat knob; second joint black, obliquely 

 transverse, and extends upward with parallel sides for some dis- 

 tance forming the handle of an immense saucer-like appendage, the 

 concavity of which is toward, the outside, and the surface scat- 

 tered over with numerous round whitish semi-transparents pots, 

 three or four of these being much larger than the others; third and 

 fourth joints black and much alike in shape but differing in size, the 

 third the largest of the two, both flattened and emitting distally on 

 their upper sides a thin flat prolongation about the length of the main 

 portion of the joint; last joint small, thinly compressed, triangular. 

 Front and middle femora with sparse, long, silky, yellowish pile on 

 outside; hind femora with thin, yellowish pile on inside and a bunch 

 of black pile on outside about a third of distance from base; tip of 

 hind tibiae and first, second, third and to some extent the fourth of 



