396 NEW YORK STATE MUSEUM 
or less distinctly visible on each segment. The hypopygium con- 
sists of two jointed hooks, is pale brown in color, nearly as long 
as an abdominal segment [fig.8]. Venter and the legs are pale 
yellow, the last two or three tarsal joints slightly infuscated. 
Legs and abdomen densely but delicately haired; wings yellow- 
ish, the veins scarcely dark; venation as in figure 10; halteres 
pure white. Length 53mm. 
Female. Differs from the male in the following particulars. 
Antennae entirely yellow, basal joint, palpi and upper surface 
of proboscis with a tinge of brown; frontal spot brown; scutel- 
lum with a fine median line and its posterior margin pale yel- 
low; abdomen yellow, dorsal surface with a tinge of brown, 
specially on the posterior margin. The two little white spots 
with pale brown margins also present on each segment. Anal 
segment brown, genitalia yellow, venter, legs, halteres etc. as. 
with the male. Wings as in figure 9. Length 5mm. Described 
from alcoholic specimens. New Jersey, Illinois, New York, Min- 
nesota. 
Larva differs from Meinerts description [loc. cit.] of the Euro- 
pean plumicornis in the following particulars. The four 
long bristles of the antennae are of equal length, while in the 
European form one is distinctly shorter than the rest; the head 
in all alcoholic specimens is more sharply constricted from the 
thorax. In Weissmann’s figure the spines of the antennae are 
shown of equal length. 
The larva is colorless, in alcoholic specimens pure white; the 
large eyes, the pair of air sacs in the thorax and in the seventh 
abdominal segment are black and the tips of the mandibles 
brown. The head is somewhat elongate, subconical, the antennae 
pendant [fig.4a], each with four long bristles of equal length. 
Caudad of these are 10 filaments, five on each side of the median 
line [fig.4b]; these are the filaments of the third metamere of 
Meinert. Then comes the pair of leaflike appendages, ap- 
pendages of the third metamere of Meinert, [fig.4c]; following 
which is the labrum. 
The labrum [fig.4/] is an elongate fleshy, fingerlike process, ter- 
minating in several tufts of hair. The two ventral tufts each with 
from 20 to 25 coarse hairs. At the base and somewhat cephalad 
of the mandibles [fig.4m] are the fans [f] each consisting of 
from 18 to 22 long, coarse hairs. The mandibles [m] have 
four or five teeth, two stout spines anteriorly, and a serrate 
posterior margin. Closing in the lateral posterior margin of | 
the mouth are the maxillae [fig.7]; fleshy lobes, each with a 
long, jointed appendage anteriorly and two short stout spines. 
At the posterior border of the mouth is the labium [/] with 
