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 nmuer- 

 0U6 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 

 Ijrown margins on knob. Length lOmni. 



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 

 liowever 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.l, 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, etc. 

 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.S.r] 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 

 <?pipharynx and hypopharynx are wanting in this specimen, 

 probably torn away when the larval skin was shed. The labium 

 [fig.3?] is somewhat triangular in shape, its lateral and 



