REPORT ON MOSQUITOES. 311 



except for the food matter in the aHmentary canal, and the yel- 

 lowish tinge to the head and anal siphon. The head is trans- 

 versely elliptical, full at the sides and pale fuscous in color; the 

 maculation on the vertex is slight and consists of a central spot 

 and twO' oblong marks at the sides more or less diffused. There 

 are six tufts of moderately long hair of four or five hairs each 

 on the dorsal part, the lateral ones near the base of the antennae. 

 The antenna (fig. 96, 3) is only slightly cun^ed. completely 

 infuscated and with a tuft of twenty or more long hairs arising 

 from a sharp offset at the outer two-thirds. The surface is cov- 

 ered with short, spiny hairs and the apex has three long bristles, 

 a short one, and a small joint. The eyes are large, there being 

 twO' distinct forms^ — one in wh.ich they are blunt at the \^ertex 

 and another in which they are drawn into an acute angle. The 

 hairs of the rotary mouth brushes are simple. The mentum (fig. 

 96,6) is pentagonal in form, with nine or eleven teeth on each side 

 of the apex ; there is some variation, chiefly in the length from 

 base to apex and the consequent slope of the sides. The mandi- 

 ble is best described by referring tO' figure 96, 4. The maxillary 

 palpus (fig. 96, 5) is oval in shape with a long apical tuft and 

 patches of short hair on the surface. The basal joint is small and 

 is crowned with small spines at its apex. 



The thorax in full-grown laiw?e is rounder, broader than long, 

 with scarcely any angulations. In the central part of the ante- 

 rior margin are twO' tufts of long hair which extend forward 

 over the head, and between these and the lateral tufts is another 

 smaller one. A few single hairs of the first lateral tuft also 

 encroach upon the anterior margin. In small larvae the thorax 

 is not SO' robust and the lateral angles are much better marked. 

 The abdominal segments from one to seven have lateral tufts 

 of twO' hairs each, except the twO' anterior ones, which ha\-e four 

 or five hairs each, and pairs of smaller and finer hairs are scat- 

 tered over the dorsal surface. The eighth segment has lateral 

 patches of small scales from thirty-five to forty in number, the 

 individual scales with long fringes at the sides and apex. The 

 anal siphon (fig. 96, 7) is pale brown, about four times as long 

 as broad and tapered on the terminal half. It has two rows of 

 spines from twelve to fifteen in each series and a number of hairs 

 arranged in pairs. The single spines (fig. 96, 8) are pale brown, 

 broad at the base and with three or four long teeth. The ninth seg- 

 ment is completely covered with the chitinized saddle and the 

 double dorsal tuft is composed of long hairs only. The ventral 

 row of tufts is normal and confined to- the barred area. The anal 

 gills are longer than the ninth segment and rather stout. The 



