short, about as wide as long; joints beyond the third becoming 
darker distally, darkest at base of each, infuscate, with verticils 
of stiff black hairs and a dense pubescence. Prothorax yellowish 
brown above with two or four darker stripes, the middle pair 
broadest before, mesonotum and metanotum paler, pleura gray; 
knob of halteres infuscated. Abdomen and male forceps yellow, 
with a rather broad black median shade, faint on the first seg¬ 
ment and distinct on the others, sometimes involving nearly the 
whole abdomen. Hypopygium very large; dorsal piece pubescent, 
tumid, inflated; upper division emarginate at tip, its lateral angles 
bilobed, outer lobe the longer and curved outwards and upwards. 
Lower division of dorsal piece emarginate at tip. Coxae gray, legs 
yellowish brown, darkening distally to the tarsi, which are mostly 
black; femora and tibiae a little darker at apex. Wings slightly 
infuscated, darker at tip, beyond the basal cells; the base of wing, 
its front margin (costal and marginal cells), and a narrow area 
behind the fifth longitudinal, all yellow. Stigma dark, and the 
usual wdiite space stretching from it along the small cross-vein 
and across the discal cell, whitening the veins in its course. No 
other white spots. 
The female, more yellow than the male, especially abdomen, wing 
veins, and legs, the tarsal joints in one specimen showing but little 
brown. The palpi, two basal joints of the antennae, and first three joints 
of the flagelhim yellow, the remaining joints dark brownish at the base 
only. The short horny valves of the ovipositor are slightly 
curved, and are covered above by a thin, leathery, three-lobed flap, 
the middle lobe being nearly concealed beneath two outer,, 
superior ones. 
We do not yet know of the occurrence of this species in 
Northern Illinois, although it is very probably not less common 
there than in the central and southern part of the State, where 
the winged insect is, in its season, one of oar most abundant 
species. 
LIFE HISTORY AND INJURIES. 
This species hibernates as a larva nearly or quite full grown, as 
shown by our collection made in Edwards county April 6, 1888, 
and in Effingham county on the 16th. At Edgewood nearly all 
had changed to the pupa by the 3d May, at which time a single 
larva was also found, and a single empty pupa case. Breeding- 
cage specimens from Southern Illinois began to emerge May 4, 
and continued to do so until the l 28th May. By May 10, these 
flies were found common in meadows near Carbondale; and 
at Urbana, May 19, they appeared in numbers at the electric light 
and flying about in meadows. The latest specimens of the season 
were collected May 31. No eggs were obtained, but pairs were* 
seen in copula late in May (19 to 31) in both fields and breeding 
cages. Idle immediate copulation of the imagos, and the immense 
