OF WASHINGTON. 143 



egg to adult in warm weather. Breeding is continuous as with 

 C. pipiens, and the winter is probably passed as adult. 



In common with other species of Culex which have the legs 

 without white bands, territans larva has the antennal tuft be 

 yond the middle of the joint and the part of the joint beyond the 

 tuft more slender than that preceding it. The most marked 

 differential character is the very slender, elongate air tube, which 

 separates this larva from that of any other mosquito yet known 

 to me.* In the first larval stage the antennal tuft is situated at 

 the middle of the joint; but the normal character is gained at 

 the first molt, though the white banding is often very incon 

 spicuous until the last stage. Most of the larvaB taken were dark 

 in color, heavily shaded with brown ; but some, from a sunny 

 roadside puddle, were very pale, of a translucent white, with the 

 chitinized parts light brownish. 



Culex triseriatus Say. 



A few examples were taken and others seen between June 

 2oth and July 8th. After that they became somewhat more 

 common, continuing all summer. No larvae were collected; 

 eggs from captive females hibernated. The species seems, 

 therefore, single brooded, but I cannot quite account for the 

 fresh specimens that were flying all the season. The eggs were 

 laid singly, adherent to the surface of the glass of the jar, just in 

 the edge of the water. 



Culex melanurus Coq. 



This is a dark-legged mosquito and consequently has a long- 

 tubed larva. The larva is very characteristic by its darkly 

 infuscated tube and plates and its peculiar lateral comb of the 

 eighth abdominal segment, which resembles a grating, the 

 spines being in the form of long bars in a single row. It is 

 slow in development and very deliberate in all its motions, 

 remaining long at the bottom of the water. It inhabits per 

 manent pools, spring pools or deep rock pools. The eggs are 

 laid singly on the surface of the pool, where they float. The 

 shell is black as usual, but so thin that the unhatched egg looks 

 gray except at the poles. Breeding is probably continuous, with 

 hibernation as adult, but the species was so rare that I did not 

 follow it continuously. 



Culex dyari Coq. 



Three larvae, taken on the day of my arrival, in a cold, per 

 manent spring pool, produced this species, and one specimen 

 was caught afterwards. No more were seen. It is probably 

 single brooded, an early spring brood with hibernation in the 

 egg, as in C. reptans. 



*Except that of C. nigritulus, which I have received from New Jersev. 

 This is very similar to C. territans. 



