202 NEW YORK STATE MUSEUM 
talia; dorsal plate short, deeply and triangularly incised, the lobes 
diverging, obliquely truncate; ventral plate long, broad, tapering, 
broadly and roundly emarginate, the lobes short, broadly rounded; 
style long, stout, narrowly rounded. Type Cecid. 1389. 
Itonida excavationis Felt 
1907 Felt, E. P. N. Y. State Mus. Bul. 110, p. 139 (C. excavata); separate, 
Pp. 42-43 (Cecidomyia) 
1908 ————— N. Y. State Mus. Bul. 124, p. 415 (Cecidomyia) 
The pale yellowish male was taken May 21, 1906 on soft maple, 
Acer tuba am) at Albany. NYY. 
Male. Length .75 mm. Antennae longer than the body, rather 
thickly clothed with short, dark brown setae, pale straw color; 
fourteen segments, the fifth with stems two and two and one-half 
times their diameters respectively. Palpi; the first segment short, 
subquadrate, slightly swollen at the distal third, the second twice 
the length of the first, slender, the third a little longer, more slender, 
the fourth one-half longer than the third; face yellowish white. 
Mesonotum reddish brown with distinct submedian yellowish lines 
sparsely clothed with setae. Scutellum yellow, tipped with carmine, 
postscutellum yellow. Abdomen pale reddish yellow with slightly 
fuscous areas dorsally on the second and third segments. Wings 
hyaline, costa pale brown; halteres yellowish transparent. Legs 
variably brown tinged with reddish, lighter ventrally, the anterior 
and mid tarsi distinctly darker than the posterior; claws slender, 
slightly curved. Genitalia (pl. ro, fig. 4); dorsal plate broad, deeply 
and roundly emarginate, the lobes widely separated, narrowly 
rounded; ventral plate narrow, narrowly rounded; style long, tap- 
ering, the margins slightly convolute, broadly rounded. Type 
Cecid. 65: 
Itonida opuntiae Felt 
1910 Felt, E. P. Ent. News, 21:10-12 (Cecidomyia) 
19m5 (=> «6ON.Y sState:Mus. Bulya7s, p.30i-41 
IOlS iia NeW: State(Mus. Buls200,psi72.073 
Midges were reared during June, July and August 1909, from 
discolored areas accompanied by more or less decay (fig. 37), at the 
base of spines on Opuntia leaves received from George V. Nash, 
head gardener of the New York Botanical Gardens at Bronx Park, 
N. Y. Apparently the eggs are deposited at the base of a spine, 
possibly near some recent wound and the larvae commence opera- 
tions upon the tissues, their work being followed by decay and in 
Some instances by the operations of a small Ptinid beetle belonging 
to the genus Catorama. In the latter case the dead tissues are 
traversed by irregular galleries, the Cecidomyiid larvae being in the 
near vicinity of living cells. This species occurred in New York 
in the leaves of Opuntia banburyana from Italy and an 
