404 NEW YORK STATE MUSEUM 
basal one half of the metatarsus are reddish brown. The 
brown of the tarsi seems to be due to the presence of the numer- 
ous brown hairs rather than to ground color. Tarsal claws 
reddish brown; all tibiae with a single delicate yellow spur; 
wings with brownish clouds, one on each of the three vein forks, 
a longer one covering the cross veins; an irregular one covers 
the bases of the veins and a cloud following the length of the 
cubitus. All veins with scales except the true cross veins and 
the first anal; venation as in figures. Halteres yellow with 
brown margins on knob. Length 10mm. 
Larva. The empty larval skin from which the figures on plate 
41 were made is in a very good state of preservation excepting 
for a longitudinal break on the dorsal surface of the head and 
thorax, and the distorted condition of the skin of the thorax and 
abdomen. In figure 1 [pl.41] the thorax and abdomen are some- 
what diagrammatic and the proportions may not be exact owing 
to the above mentioned fact; the head and the anal appendages 
however are drawn to scale. The larva resembles Corethra and 
Mochlonyx (a European genus) in the form of the antennae, 
which are elongate, and provided with stout spines, set at an 
angle with the long axis of the antennae [fig.1, 2]. The spines 
are three in number, wherein this genus differs from Corethra 
and Mochlonyx which have four. The, mandibles are more 
highly developed than in the other genera of this family, and 
possess two stout curved teeth, besides several smaller teeth 
and spines (ventral view figure 3m; dorsal view figure 5). The 
fanlike brush of hairs so conspicuous in Anopheles, Culex, ete. 
and somewhat also in Corethra and Mochlonyx seems to be want- 
ing entirely here. The labrum [fig.6] is trapezoidal in shape, 
its anterior margin being straight. On its upper surface it is 
provided with two stout bristles, besides 10 smaller ones 
arranged as shown in the figure. Two converging rows of 
scales are present, these reaching the extreme front margin. 
One of these scales is shown in figure 9. The anterior margin 
is somewhat ciliated; and on the under surface are two con- 
verging rows of transverse chitinous ridges, five or six ridges to 
each row. The maxillae [fig.32] resembles those of Corethra, 
its anterior margin provided with numerous scales and hairs. 
The scales resemble those of the labrum [fig.9]. At the base 
near the articulation of the mandible is a wartlike prominence 
with four short spines; this may possibly be the maxillary 
palpus. Toward the inner margin is a single stout bristle. The 
epipharynx and hypopharynx are wanting in this specimen, 
probably torn away when the larval skin was shed. The Jabium 
[fig.32] is somewhat triangular in shape, its lateral and 
