AQUATIC INSECTS IN NEW YORK STATE 397 
two short spines. The thorax is cylindrical, of greater diameter 
than the abdomen; the two black air sacs distinctly visible. 
The abdomen is of circular cross section, tapering gradually 
toward the caudal end. Segments are subequal in length ex- 
cept the first, which is somewhat shorter; each provided with a 
few short hair tufts. The black air sacs of the seventh seg- 
ment are large and distinct. On the ventral surface of the anal 
segment [fig.6] is a fan of 25 long, feathered hairs, arranged 
on a keel or ridge. At the apex of this segment are four elon- 
gate blood gills and four long, feathered hairs, and near the 
apex, arranged in a transverse row on each side, is a comb 
of about 15 small, short hooks, curved cephalad; attached 
to the base of each hook is a delicate transparent, sickle- 
shaped blade, with a serrate inner margin; the surface of the 
blade is covered with transverse ridges, which give it the appear- 
ance of a curved pectinate hair, owing to its transparency. 
The combs are difficuit to see. Ventrad of the combs is a pair 
of large blunt hooks curved cephalad. 
The pupa [fig.2] resembles that of Culex, pale yellow in color, 
the thorax with three brown longitudinal stripes, the middle 
one divided by a yellow line. Eight abdominal segments are 
present, the first and eighth shorter than the others, and on 
each are found a few scattered hairs. Attached to the eighth 
segment are the swimming paddles [fig.5]; these differ from 
those of Culex in having, besides the median rib, each margin 
also supported by a rib. On the inner rib is a row of eilia. 
-The breathing trumpet [fig.20] is spindle-shaped, covered with 
a close network of pentagonal and hexagonal figures. The small 
aperture is at the apex. 
Corethra punctipennis Say 
Acad. Nat. Sci. Phila. Jour. 1823. 3:16. and Compl. Wr. 2:48. Wiedemann. 
1828. 1:14 
Whitish; wings and feet punctured with fuscous. Inhabits 
Pennsylvania. 
Hair of the antennae yellowish white, the centers of the 
whorls being fuscous; the shaft of the antennae has a decidedly 
annulated appearance; eyes black; thorax with three pale yel- 
lowish brown abbreviated, broad lines, the middle one originat- 
ing before and terminating at the center of the disk, the lateral 
ones originating rather before the middle; feet with numerous 
small brown punctures; wings with many very obvious brown 
spots. 
Size of C. culiciformis Degcer (i. e. 6mm) 
