74 S. W. WILLISTON, M. D. 



Proctacaiithus Milbertii. 



Proctacanthas Milbertii Macquart, Dipt. Exot. i, 2, 124, 8. 



? Asilu.i agrion Jaennicke, Xeue Exot. Dipt. 57. 



Asiius missiiriensis Eiley, 2d Report, 122, fig. 89. 



'^ , 9 • Length 30-.35 mm. Face more or less red in ground color, but densely 

 covered with gray pollen, the rather sparse white mystax composed chiefly of 

 bristles. Antennse black,- the tip of the second joint and the third joint some- 

 times red. Beard moderately abundant, white. Dorsum of thorax covered with 

 nearly white pollen, the ground color in large part red, leaving the black as two 

 median stripes and two large spots t>n each side, the one before, the other behind 

 the suture, but obscured by the pollen. At other times the dorsum is almost 

 wholly black in ground color with the humeri and post-alar callosities red ; bristles 

 mostly white; pleurae thickly pollinose with whitish. Abdomen black, but 

 densely, wholly, and evenly covered with nearly white pollen, or at th<i,mos 

 with a faint shade of brownish. Oviduct shining. At times the ground-color on 

 the posterior margins of the segments may be red and the oviduct may be shining 

 red; hypopygium red. Legs. usually dark red with the femora broadly black in 

 front but somewhat variable, the tarsi often blackish. 

 Ifab. — Mo., Kans. 



A very comaion species on the Kunsas Plains in July and August, 

 where I collected about 40 specimens. Its large size and white pollinose 

 abdomen will enable it to be recognized. 



Proctacaiitlius ruTtis n. sp. • 



5" • — Length 30 mm. Front above scarcely narrowed, not much narrower than 

 the distance between the eyes below, clothed with black hair and bristles through- 

 out. Antennae wholly red, broadly separated at the base, the basal joints with 

 black hair. Ground color of front and face light red, the latter clothed wholly 

 with nearly white hair. Pile of beard soft, nearly white, occipito-orbital bristles 

 black and light yellow. Thorax deep red, the dorsum rich opaque reddish brown 

 on the lateral margin slightly ochraceous pollinose, clothed in front with short 

 black hairs, behind and on the scutellum with not very abundant black bristles 

 the fan-like row of bristles in front of the scutellum black. Abdomen light 

 opaque yellowish red, a little darker and shining on the terminal segments; first 

 segment and narrow base of second black ; wholly clothed with very short, sparse 

 white pile, black hairs, and on the sides yellowish. Venter with long but sparse 

 white pile. Front and middle coxse with not abundant white hair. Legs deep 

 red with black hair and bristles, the row of bristles below the front femora long 

 Wings rather strongly tinged with brownish, veins nearly black. 



Ilab. — N. Carolina, Massachusetts. 



Proctacantlius heros. 



Asiius heros Wiedemann, Auss. Zw. Ins. i, 427, 3. 



Pror.tacanthus heros Schiner, Vehr. Zool. Bot. Ver. xvi, 682; id. ibid., xvii, 396. 



J .—Length 38 mm. Front and face red, but chiefly concealed beneath yellow- 

 ish gray pollen, mystax, hair of the fVont and the beard tinged with yellow, 

 without intermixture of black. Face in profile below the antennae rather strongly 

 concave, on the lower half perpendicular and straight. First two joints of the 



