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 segment. The segment behind the 

 head is without prolegs. " 



The pupae are free swimming, and very active. The breath- 

 ing tubfs are situated at the sides of the thoracic segments. 

 The .nbdomen terminates in two leaflike appendages, that act 

 as propellers; but in general the pupae remain near the surface, 

 except when disturbed. 



KEY TO GENERA OP CULIOIDAE OP THE JTORTHBRN 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 (2) 



2 Last segment dorsally with a flat area in which may be seen 



two spiracles (3) 



Last segment usually with hooks, no spiracles apparent. 

 Larva transparent, glasslilfe Corethra 



3 Large species with the anal segment bladderlike. Mandibles 



strongly developed [pl.41, fig,.!] Pelorempis, gen. nov. 



Species of medium size with anal segment cylindrical. ..Anopheles 



4 Antennae pendant and ending with four large curved spines. 



Mochlonys (Europe) 



Antennae not pendant (5) 



6 Antennae fold back against head and terminate in 2 or 3 



claws [pl.40] ...Corethrella 



Antennae usually only with a few small erect bristles and , 



one or two- pointed processes ' (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 (10) 



Last segment with ventral brush (8) 



8 Anal blood gills dilated; lateral comb of eighth segment a 



single transverse rO'W of spines with elongated bases; anal 



segment without hair tufts before barred area 



Stegomyia (fasciata) 

 Anal blood gills slender (9) 



9 Anal blood gills sharply pointed, air tube spines with one 



tooth; lateral comb of eighth segment a few large spines 



in a single or partly double row A e d e s (fuscus) 



Not as above in all respects Culex 



