REPORT ON MOSQUITOES. 167 



stout spines and two lamellate processes at the apex, and at about 

 one-third from the apex issues a stout hair which divides into 

 a number of branch hairs. 



The thorax is subquadrate. the angles rounded, each angle with 

 three or four long feathered hairs, and two smaller simple hairs 

 on each side between them ; several similar, small hairs are on 

 the dorsal surface. 



The abdominal segments are transversely oblong anteriorly, 

 becoming subquadrate posteriorly; the first two have each two 

 long feathered hairs laterally, the third has but one;* the four 

 succeeding segments have from two to four rather short simple 

 hairs on each side, and very small simple and feathered hairs 

 are at the base of the long hairs on all segments. On the dorsal 

 surface, near the base of segments three to seven, are two small 

 palmate hairs, and in the center, at the apical margin of segments 

 one to eight, are small chitinized plates and sometimes extremely 

 small circular dots below them. The eighth segment bears the 

 respiratory apparatus ; this is a very complex organ, which pro- 

 jects backward over the ninth segment as seen in the side view 

 (fig. 7.) The tracheal tubes open on the dorsal surface of this 

 structure by two stigmata, and immediately in front of these is 

 a small plate which folds over the stigmata when they are not in 

 communication with the outer air. Posterior to these openings 

 is a large, partly chitinized squarish area, which comes in contact 

 with the air when the stigmata are projected through the surface 

 film. At each side of this apparatus is a triangular plate with 

 from six to nine long teeth on the posterior margin and one to 

 four short teeth between (fig. 9) ; usually there are about twenty 

 in all. 



The ninth segment is longer than broad, widest at the outer 

 end and with the dorsum covered with a chitinized saddle which 

 extends half way down the sides. The dorsal tuft is composed 

 of two very long branched hairs and two shorter feathered ones ; 

 on the ventral surface is a semicircular process from which issue 

 about nine long branched hairs with fan-like arrangement. The 

 tracheal gills are fingershaped, blunt at the apex and slightly 

 longer than the ninth segment. 



Habits of flic Early Stages. 



There is nothing peculiar to this species in the development 

 from egg to adult. The larvre occur throughout the State wher- 



* The drawing shows two hairs on each side of this segment ; this is in- 

 correct. 



