20 = Bulletin of the Brooklyn Entomological Society Vol. XII 
Palpi black, either entirely or in larger part; frons black on upper half; 
mesonotum with black marks similar to those on elegans; but the 
median vitta is acute posteriorly, and the markings are less clearly 
defined; pleurze black except on anterior margin; antenne infuscated 
at insertion (of ‘arista> femaleyaneeese ASAIO a arpidia Mall., typical. 
The localities and dates of the varieties are as follows: 
atra, Dubois, Ill., May 23, 1917. 
humeralis, Dubois, Ill., May 22, 1917. 
elegans, Freeport, Ill., July 4, 1917. 
arpidia, Urbana, II1., Wie I, 1916, type; Aberdeen, S. D., July 12; Strat- 
ford, Ill., June 22, 1917. 
With the exception of the paratype of the type form from 
South Dakota the specimens were taken by the writer. No data 
as to nature of habitat of the former is available; the others 
were all taken in woodlands, and, with the exception of the type 
specimen, in the vicinity of streams. The larval habits are un- 
known. 
Dasyopa gen. nov.—Generic description: Closely resembles Madiza (Si- 
phonella auct.), differs in having the mesopleurz hairy on the upper pos- 
terior portion, and the hind tibiz without the sensory. area. 
Ocellar bristles usually convergent and directed slightly backward; eyes 
hairy; anterior angle of cheeks much produced; proboscis elongated, 
geniculated; arista short pubescent. Mesopleurze hairy above; humeral 
bristles 2-3 in number; a transverse series of six bristles near posterior 
margin of mesonotum; scutellum convex. Hind tibiz without well defined 
sensory area. Wing venation as in Madiza. 
Genotype, Dasyopa pleuralis sp. nov—Male and female: Black, ground 
color obscured by yellowish gray pruinescence. Frons yellowish gray, 
sometimes slightly ferruginous; ocellar triangle slightly shining, dark gray, 
in the female usually with the posterior lateral angles yellowish; antennz 
and arista black; proboscis black; palpi rufous yellow; cheeks colored as 
frons, with a dark line on lower margin. Dorsum of thorax usually with 
four indistinct vittee which are but slightly darker than disc, lateral mar- 
gins, especially anteriorly, yellowish; apex of scutellum sometimes of same 
color; pleurze obscurely yellowish, a large spot on lower margin of meso- 
pleurze and the lower half of sternopleure glossy black; postnotum shin- 
ing black. Abdomen subopaque, black. Legs blackish brown, fore coxe, 
apices of femora and bases of tibie yellowish. Wings clear. Halteres 
cream-colored. 
Frons slightly decliventous, half the head width; triangle pointed, ex- 
tending half-way to anterior margin of frons; orbits each with 6-8 black 
setule on upper two thirds of their length; frons with numerous short, 
pale hairs; antennze of moderate size, third joint with apex rounded; 
