S. W. Williston — N'evj Diptera. 245 



rax black and sliining where denuded of the gray pollen ; three mdis- 

 tinct lighter stripes of the color of front, abbreviated posteriorly. 

 Abdomen thickly pollinose, the blackish, opaque ground-color with 

 narrow whitish posterior borders to all the segments ; two series of 

 small, median, more or less indistinct, brownish spots on the anterior 

 parts of second, third, and fourth segments ; tip thinly whitish pilose. 

 Legs reddish ; ends of all the femora and tibire, anterior tarsi, middle, 

 and posterior tarsi, except the larger part of basal joint, black. 

 Wings pubescent, hyaline ; stigma brown, reaching across the mar- 

 ginal cell, veins at bases of second submarginal, first, second, and 

 fourth posterior cells, with narrow blackish clouds ; also a number 

 (4-8) of minute brown spots on all the veins beyond the discal cell. 

 Long. Corp. 8'""'. Kansas,— E. W. Guild. 



Agrees closely in structure — except the pubescent wings — with S. 

 gigantulus Lw., the only other North American species, but is very 

 different in coloration. 



Chrysops discalis, n. sp. $ . 



Large. Front black, with gray pollen, ocellar area not denuded, 

 callosity small, shining-black, oval. Face yellow, with four small 

 black spots, the upper pair broadly, the lower narrowly separated. 

 Antenna} : basal joints fuscous, white pubescent, first joint yellow on 

 inner side, third joint l)lack. Palpi the color of the face, white pubes- 

 cent Thorax with four cinereous stripes, leaving black intervals, of 

 which the median is narrow. Scutellum cinereous. Abdomen : first 

 segment black, with a small yellow spot on each side of the scntel- 

 lum ; second segment yellowish cinereous with four black spots, the 

 outer ones smaller and posterior, the median ones larger, subquad- 

 rate, anterior, narrowly interrupted ; third segment with the four 

 spots subequal, indistinct, posterior part and all the remaining seg- 

 ments blackish, with cinereous pollen and yellowish incisures. Ven- 

 ter reddish yellow with three series of black spots, median ones broad 

 and triangular with the base in front, outer ones small, oval ; sixth 

 and seventh segments chiefly black with reddish yellow posterior 

 margins. Legs reddish yellow ; extreme tips of all the femora, ante- 

 rior tarsi and tips of other tarsi black, tips of anterior tibia? infusca- 

 ted. Wings with pale brownish design. End of first basal cell, all 

 of second and third basal cells, anal angle, large spots in tlie discal 

 and fifth posterior cell and usual crossband, hyaline. Apical portion 

 grayish, with a distinct brown spot at the furcation of the third longi- 



