;12 



SCIENCE. 



[N. S. Vol. XX. No. 505. 



entomologists. In addition to mucli greater 

 facility in capturing, transporting, feeding 

 and keeping tliem moist, the ants are placed 

 tinder much more natural conditions and may 

 be expected to show more normal behavior. 



0. r. Cook. 

 Washikoton, D. C, 

 August 17, 1904. 



IMPORTANCE OF ISOLATED REAEINGS FROM 

 CULICID LAEV.E. 



The fact that four, five or more species of 

 larvffi occur in associsrtion in the same pool, 

 renders it difficult to separate the various 

 species, especially as living larvEe resemble 

 each other very closely. Particular attention 

 has been paid to this phase of the subject 

 during the present season with very gratifying 

 results, as may be seen from the following: 



A larva somewhat resembling and associated 

 with Culex impiger presents marked differ- 

 ences in that the dorsal siirface of the air 

 tube is provided with a double row of hairs, 

 each row consisting of about four tufts com- 

 posed of a pair of weakly barbuled hairs. This 

 is undoubtedly the larva which Messrs. Dyar 

 and Knab* have conftised with that of Culex 

 impiger. From this larva a large, brownish- 

 gray mosqtiito 6 to 7 mm. long, with the 

 curved scales of the head white, was obtained. 

 This species has been given the name of Culex 

 cinereohorealis n. sp. 



A larva somewhat resembling that of C. 

 impiger was met with in a cold mountain pool 

 at Elizabethtown, N. Y., June 9, adults emerg- 

 ing on the tenth and closely resembling those 

 of C. impiger. The larva may be easily recog- 

 nized by the conspicuous, triangular comb 

 composed of about sixty rather large scales, 

 each tipped with from four to seven stout, 

 equal spines. The air tube is short, a little 

 over twice as long as broad, slightly swollen 

 at the basal third and bearing a double row of 

 posterior peeten, each consisting of about 

 twenty short, black, stout spines. The adult, 

 Culex lazarensis n. sp., may be distinguished 

 from C. im,piger by its large size, it being 6 

 to 7 mm. long, and the vittate thorax with two 

 dark lines. The wing of the female C. 

 lazarensis is longer, the second longitudinal 



* Ent. Soc. Wash. Proc, 6: 144, 1904. 



vein, particularly at its fork, is straighter, 

 and the second fork cell is shorter and broader 

 than in C. impiger. There are also marked 

 differences in the male genitalia. 



Another very interesting larva was met with 

 June 14 in a cold mountain pool at Elizabeth- 

 town, N. Y., and may be easily recognized by 

 the comb consisting of but six to seven thorn- 

 like scales arranged in a curved line, with a 

 large, finely setose, spatulate base and with a 

 stout, apical spine. The air tube is about 

 three times as long as wide, tapering regTilarly 

 and with double posterior peeten on the basal 

 third, each row consisting of twelve to fifteen 

 closely set, stout spines, each bearing near the 

 basal third one large and usually a smaller 

 tooth. This larva produced an adult, Culex 

 ahserratus n. sp., which^ resembles C. impiger 

 very closely and maj^ be separated therefrom 

 by the posterior cross vein being its' own 

 length or more from the mid cross vein, the 

 thorax spotless, basal abdominal bands dis- 

 tinct, and the petiole of the first submarginal 

 cell one half the length of the cell. 



A long-tubed larva with a comb consisting 

 of about eighteen triangular, stout, spined 

 scales arranged in two or more rows, some of 

 the scales having a very stout, terminal spine 

 with smaller ones along each side, while others 

 have the tips somewhat rounded and the 

 spines more nearly of a size, was taken in a 

 woodland pool at Earner, on May 10, adtilts 

 emerging on the sixteenth. The air tube is 

 fully five times as long as its greatest diam- 

 eter, tapering somewhat regularly and with a 

 slight bend and contraction near the middle. 

 There are two rows of peeten, each consisting 

 of about twenty-two closely-set teeth bearing 

 at their bases usually two larger and three or 

 four fine serrations. This species, Culex 

 fUchii n. sp., is close to Culex squamiger Coq., 

 and may be separated therefrom by the scales 

 of the pleura being white and the posterior 

 cross vein its own length from the one above. 

 The basal segments of the antennse are 

 clothed interiorly with broad white scales ; 

 proboscis dark-brown, long; palpi dark brown, 

 segments narrowly ringed at the base with 

 white ; occiput clothed with brown scales, with 

 a row of silvery ones just above the eyes and 



