April ’89.] history society of Wisconsin. 
211 
much more sparse than in the female, no fringe of hair on margins of 
wings, apical half of third vein obsolete; no traces of bifurcation, 
abdomen cylindrical, attenuate, hairy, fuscous above, paler beneath. 
I have placed this species in the typical genus Cecidomyia 
as defined by Schiner, the venation of the wings, the 
structure of the antennae, etc., leaving little doubt as to 
its position. 
The gall of this species is produced from a puncture ot 
the terminal bud of the plantlet early in April, the insects 
probably appearing soon after the snow melts from some 
gall on another plant unknown to me. The gall on 
Antennaria, which is from Vs to V 2 an inch in diameter, is 
corm-shaped and is brought about by<a checkin the growth 
of the scape-like flower-bearing stem, the sessile leaves o 
which become somewhat succulent, broader and on & er 
than under normal circumstances, and, excepting the tips, 
which are somewhat recurved, closely applied to one a 
other like the leaves of an onion. Both surfaces o t e 
component leaves of the gall are covered with w oo y 
chomes, while the parenchyma cells of then more succuen ^ 
basal portions acquire a reddish coloring matter, 
quently all the terminal buds of a plant to the num e 
a dozen dr more will be found to have been punctur y 
the flies and converted into galls, which form c us 
remotely resembling bunches ot young haze nu 
insect lays from 1 to 15 eggs in each bud on an ax 
from 3 to 7. The numerous larvae are found ybeddp 
in the woolly center of the gall, and thoughc ose og ’ 
are usually isolated by films ot matted trichomes ^ 
Pupation takes place duringthe first wee o ay 
change from the larva to the pupa is \er\ gra n , 
owing to the transparency of the larva cu ic e ^ 
opaque orange tint of the enormous fat-body ^ 
sion of the milk white imaginal discs into re ^ 
legs, wings and halteres of the imago may 
great ease. 
