355 
Type, male, allotype, and two female paratypes, Urbana, IIl., June, 
1917. Reared from larvae found feeding on aphids on Spirea vanhouteii 
(J. R. Malloch). This series has the thorax vittate. 
The puparia of this. species, from which the type series emerged, 
differ from those of orbitalis in having the surface except on venter cover- 
ed with wart-like’ protuberances which are tipped with minute spines or 
setulae. These protuberances are not serially arranged and are separated 
by a little wider space than the width of the base of one protuberance. 
The empty puparium is yellowish in color, slightly shining, with a pale 
brownish vitta between median line and dorsolateral margin. In form 
it is more robust than that of orbitalis and has a slight but evident longi- 
tudinal depression along each side, so that the portions dorsad and ventrad 
of the depression form rounded elevations. Anterior respiratory organs 
minute, with a few microscopic apical filaments; posterior respiratory 
organs pedunculate, about three times as long as their basal diameter, 
separated by a distance equal to their length, their surfaces warty, apical 
filaments very minute, apparently 4 or 5 in number. 
Length, 3 mm.; greatest width, 1 mm. 
This species is by far the commonest of the genus in the state, occur- 
ring in all the localities in which I have collected. It has previously been 
referred to in literature as nigricornis Egger, but I consider it inadvisable 
to use the name of a European species for one taken in this country until 
a very careful comparison of the American and European specimens has 
been made. 
I have before me a very large number of specimens which I consider 
belong to this species. Those with larval data are as follows: 2 speci- 
mens, reared from larvae found feeding on aphids on black locust, Chi- 
cago, Ill., September 18, 1908 (J. J. Davis) ; 1 specimen, reared from a 
larva found feeding on aphids on Spirea vanhouteii, Urbana, Ill., June 
25, 1916 (J. R. Malloch) ; 2 specimens, one with and one without vittae 
on thorax, reared from larvae found feeding on aphids on apple, Amer- 
ica, Pulaski Co., Ill., June 30, 1916; 4 specimens, reared from larvae found 
feeding on Aphis rumicis on thistle, Chicago, Ill., August 30, 1908 (J. J. 
Davis). 
The other specimens in our collection bear no data as to larval food- 
habits but are from the following localities: Urbana, Champaign, St. 
Joseph, Muncie, Monticello, Ashley, Meredosia, Algonquin, and 
Waukegan. 
LeucopomytA, subgen. n. 
This subgenus differs from Leucopis in the larval stage in having 
the body cylindrical and evenly rounded at the posterior end, the anal 
respiratoty processes sessile, situated high above the ventral level and 
widely separated, and the surface of the body with but indistinct spinose 
armature. The adult differs in having praescutellar acrostichal' and no 
ocellar bristles. 
Genotype, Leucopomyia pulvinariae, sp. n. 
