390 NEW YORK STATE MUSEUM 
ciliated with hairs, by means of which a current of water is. 
produced that brings little particles of food within reach. 
At the posterior end of the body is usually a single breath- 
ing tube, or there are two tubes opening to the exterior on 
the dorsal surface of the last BCeMCe The segment behind the 
head is without prolegs. 
The pupae are free swimming, and very active. The breath- 
ing tubes are situated at the sides of the thoracic segments. 
The abdouien terminates in two leaflike appendages, that act 
as propellers; but in general the pupae remain near the surface, 
except when disturbed. 
KEY TO GENERA OF CULICIDAE CF THE NORTHERN STATES 
Larvae 
1 The last abdominal segment with a single dorsal breathing 
tube, through which may be seen a pair of large tracheae........ (4) 
Last segment without long breathing tube.............. te ease. (2) - 
2 Last segment dorsally with a flat area in which may be seen 
TWO SPITACIES 2.0.5 Love eek nee wee wtmc wee were 6 nrc ee ree (8) 
Last segment usually with hooks, no spiracles apparent. 
Larva transparent,.glasslike. os. 2.0.. 3.0 be50e ae Corethra 
3 Large species with the anal segment bladderlike. Mandibles 
strongly developed [pl.41, fig.1]........ Pelorempis, gen. nov. 
Species of medium size with anal segment cylindrical...Anopheles_ 
4 Antennae pendant and ending with four large curved spines. 
Mochlonyx (Hurope) 
Antennae Not pendants. ooo. 6 vvc sien wc os ve busin ew © he ce (5) 
5 Antennae fold back against head and terminate in 2 or 3 
claws: [plato cca a7. ome cee eee eaters bie. eee Corethrella 
Antennae usually only with a few small erect bristles and 
one or two pointed processes....5..0.0. Gs. sauce b+ oseie enone (6) 
6 With brush of hairs projecting forward from the mouth............ (7) 
Brush projects laterad from the mouth. Mandibles long and 
Sharply toothed; large species about 10mm long.......... 
Psorophora (ciliata) 
7 No ventral brush on last abdominal segment..... *s a.0.078,0) ea (10) 
Last segment with ventral brush... ..5. .0..4~< ces. oe ls oe Cee (8) 
8 Anal blood gills dilated; lateral comb of eighth segment a 
single transverse row of spines with elongated bases; anal 
segment without hair tufts before barred area. 
Ss ise e or om = ia (fasciata) 
Anal blood gills: slender... % «sides. ss sds oh ee gedee ee en ee eee (9) 
9 Anal blood gills sharply pointed, air tube spines with one 
tooth; lateral comb of eighth segment a few large spines 
im a single or partly double row. .:..........:eches Aédes (fuscus) 
Not as above in all respects... o:.és cic cee enews tee ee ee 
