March, 1905.] DVAR : NOTES ON MOSQUITO LaRV.E. 27 



deep, the small spines with feathered tips. In stage iii the antennae 

 are the same ; the tuft on the tube consists of several hairs, is situated 

 as before, opposite the middle of the branched pecten, which is fol- 

 lowed by several long, hair-like pectinations. Anal segment with a, 

 dorsal plate, several tufts before the barred area ; comb teeth of the 

 eighth segment with feathered tips. In the fourth stage the hair-like 

 pecten on the air-tube is increased and elongated, while the anal seg- 

 ment becomes ringed by the plate. The antennae are not changed. 



Identity of Culex impiger Walk. — The form referred to by me 

 under this name (Proc. Ent. Soc. Wash., vi, 37, 1904) has since been 

 described as pullatus, while of the two forms referred to by Mr. Knab 

 and myself (Proc. Ent. Soc. Wash., vi, 144, 1904), the first is pul- 

 latus, the second trichurus. This leaves the larva of impiger unknown ; 

 but I am glad to be able to adopt for it the one identified by Messrs. 

 Felt and Young (Science, n. s., xx, 312, 1904), which Dr. Felt has 

 kindly communicated to me. It closely resembles sylvestris, but dif- 

 fers therefrom in the longer anal segment, the chitinous plate of which 

 appears longer than wide from side view and is deeply incised laterally. 



Larva of Deinocerites cancer Theob. — We have received this 

 larva from Kingston, Jamaica, through the kindness of Dr. M. Grab- 

 ham. It has the general structure of Culex. The eyes are small but 

 transverse, double ; antennae small, slender, uniform, with single hair 

 tuft at the middle. Comb of the eighth segment a large patch of very 

 small scales many rows deep, irregular in size and with divided tips. 

 Air tube slender, four times as long as wide, a little tapered apically ; 

 two rows of pecten of few teeth, followed by a single hair on each 

 side, the pecten teeth strongly furcate. Anal segment ringed by the 

 plate, a dorsal patch and a small ventral one before the brush well 

 chitinized, the sides nearly colorless. Anal processes absent, replaced 

 by an annular cushion which is weakly divided into halves. 



The larva is a very distinct one. 



Larva of Howardina walkeri Theob. — This larva also was 

 communicated to us by Dr. Grabham, from Anchona, Jamaica, 5,000 

 feet altitude. It is extremely characteristic, being of the Uranotcenia 

 form with the characters accentuated. All the hair tufts, except the 

 lateral thoracic and those of the anal segment, are of the stellate form, 

 composed of numerous short hairs. The head is smooth, rounded; 

 antennae short with hair at the middle. Abdominal segments, except 

 in the intersegmental area, darkened by numerous small black spicules. 



