231 
of the petiole and the base of abdomen covered with a spongy 
gum-like mass of a whitish color. Wings as long as the 
abdomen and half the thorax; smoky, the apex ciliated; 
devoid of all nervures, except the humeral nervure, which is 
straight, placed immediately below, and running parallel 
with, the costa; from the base of the wing runs a thin cloud 
which bifurcates in two when it reaches the basal third of 
the wing, the lower fork being the longest. Coxse, femora 
and tibiae reticulated like the head, but much finer, bear- 
ing some depressed hairs; the hind tarsi are double the 
length of the tibiae, the metatarsus itself being longer than 
the tibiae, and longer than all the other tarsal joints united; 
four hinder tibiae without spurs ; claws simple. Uniformly 
ferruginouSj the tips of tarsi paler. $ 
What I take to be the worker differs from the female 
only in wanting ocelli and slightly in the forjn of the thorax. 
Length from 2 to 2 ’5 mm. 
Hab. — Nagasaki, Japan, March 3rd. 
The genus Strumigenys was created by the late Mr. F. 
Smith of the British Museum, in the Journal of Ent., 1860, 
p. 72, on a species from Brazil. Misled by Smith erro- 
neously describing the antennae of Strumigenys as 8-jointed 
instead of 6, Boger formed a genus, Labidogenys (Berk Ent. 
Zeit., 1861, p. 252) for a species from Ceylon, and at the 
same time, {l.c. p. 253) made another genus, Pyramica, for 
a closely allied species from Cuba. Roger, however, became 
aware of the mistake made by Smith in counting the 
number of the joints in the antennae in Strumigenys and 
therefore Roger sunk Labidogenys as a synonym, as also 
his Pyramica {l.c. 1863, p. 40). Smith himself appears to 
have forgotten his genus Strumigenys; for in 1864 he created 
a genus ( Cephaloxys) for a species from New Guinea, which 
is undoubtedly identical with Strumigenys, 
The form of the mandibles and the number of the teeth 
seems to vary in each species. The spongy structure on the 
abdomen, I thought at first was extraneous gum, but after 
ca;reful examination, and after making many attempts to 
