116 NEW YORK STATE MUSEUM 
twice its diameter, the third one-third longer than the second, mor 
slender, the fourth a little longer than the third, somewhat dilatec 
face fuscous yellowish. Mesonotum dark brown, the submedia 
lines thickly haired. Scutellum and postscutellum dark browr 
Abdomen a light olive brown, rather thickly clothed with fuscou 
hairs. Wings subhyaline, spotted with fuscous, with fuscous mark 
ings at the basal third on costa and at the posterior margin and nea 
the middle of the third vein and at the fork of the fifth vein and | 
less distinct fuscous spot at the apical third on the third vein; cost. 
pale straw; halteres yellowish transparent. Legs a light yellowis. 
brown, except the posterior tibiae and tarsi which are light yellowisl 
with a long, fuscous annulation on the tibiae distally, the thre. 
distal tarsal segments slightly fuscous; claws long, slender, strongh 
curved, the pulvilli a little shorter than the claws. Genitalia: dorsa 
plate long, broad, deeply and triangularly emarginate, the lobe. 
narrowly rounded. Type Cecid. so9. 
Contarinia negundifolia Felt 
1908 Felt, E.P. N.Y. State Mus. Bul. 124, p. 394 
900 eam a ets soe. Ont. 40th) Repitap. 43 
The species, received through the courtesy of the United States 
National Museum, was reared April 21, 1885 from leaves of box 
elder, Negundo aceroides, collected by Theodore Pergande 
May 12, 1884 in Virginia. Mr Pergande states that the larvae 
deserted the gall May 15th and entered the ground, remaining there 
until the following spring. Apparently the same form was received 
June 20, r908 from the late Dr James Fletcher, Ottawa, Can., and 
again July 8, 1916 from Winnipeg, Manitoba, through J. M. Swaine, 
assistant entomologist of the entomological branch of the Canadian 
Department of Agriculture. It may possibly be identical with 
Cecidomyia negundinis Gill. 
Gall. Irregular, globose, pocket-shaped, separate or confluent, 
midrib or vein swellings, usually with a slight enlargement on the lower 
surface and a marked elevation on the upper surface. The color 
may vary from a light bluish green to a yellowish or even deep red; 
diameter 2 to 4 mm, the opening on the under surface. Badly infested 
leaves may be crumpled and yellowish. 
Larva. Moderately stout, whitish, distinctly segmented, the 
extremities rounded; length 2 mm: head small, broadly rounded 
anteriorly, the antennae moderately long, biarticulate, the terminal 
segment narrowly rounded apically; breastbone bidentate, narrowly 
triangular, the anterior margin expanded and the shaft tapering 
from the base of this to a subacute apex posteriorly; skin rather 
coarsely shagreened, posterior extremity broadly rounded and with 
a dorsal pair of submedian short, broadly triangular, chitinous 
processes. 
