CULEX COKONATOK 289 



tain stream, in a rain-water tank used for drinking, in a cement trap containing 

 sink-water, in a tin can, in an old barrel, in the bottom of an old boat, in an open 

 fountain on a plaza, in an old sugar-boiler, and in dark, foul water in swamps 

 along a railroad ; Mr. Jennings found them in water in hoof -prints and a wagon- 

 rut, in an old kettle, in the trunk of a large fallen tree, in a pool in a field, in a 

 swamp back of a dump, from a rapidly running river, from a reservoir, in 

 puddles in a road, from a stream supplying a reservoir, from a pool in a swampy 

 common at the edge of a town, and from a brackish pool in rocks above high-tide 

 level ; Mr. Knab found them in large numbers in a puddle in a street, in puddles 

 in a stream-bed, in an old tank about 2 feet square under a bridge, in a tub of 

 dirty water on a back porch, in a ditch of slightly muddy water near town, in a 

 ditch containing a small quantity of foul water among bones and rubbish, in a 

 trench back of a store, in a large well in an open field, in a ditch near a swamp 

 which had been oiled but the oil had been blown aside by wind, in a tank in a, 

 garden, in a very muddy roadway along railroad tracks, in a ditch of filthy water 

 near salt-works but the water fresh, in a pool of stagnant water in thick woods, 

 in a small grassy pool near a beach, in pools full of algae with Anopheles, in 

 masonry tanks near a stream used for washing and bathing, in swampy ground; 

 along railroad tracks that had been oiled but cattle tracks had disturbed the 

 film of oil, in large puddles in a road caused by recent rains, in rock-pools in a 

 stream-bed, in a ditch of filthy water with a slight current, in hole in the root 

 of a large tree, in a shallow pool frequented by cattle, in a boat full of rain-water, 

 in puddles in a freshly dug ditch, in a water-hole in a stream-bed associated with 

 Culex derivator, Uranotania basdlis. Anopheles argyriiarsis. Anopheles psevr 

 dopunctipennis, and an Aedes, in a small ditch of muddy water associated with 

 Culex pinarocampa and Aedes cuneaius, in a pool in a stream-bed associated 

 with Culex pinarocampa and Anopheles wrgyritarsis, and in a water-hole beside 

 a raidroad track associated with Culex pinarocampa, Lutzia bigotii, and Ano- 



From the above it appears that the larvae do not generally frequent tree-holes, 

 nor take readily to artificial receptacles. The eggs are laid in raft-like masses. 

 Mr. Knab counted the eggs in three masses, obtaining respectively the numbers 

 153, 156, and 158. The rafts were from seven to nine rows wide and contained 

 at the most 37 eggs in the longest central rows. The egg-masses were floating 

 upon the surface of the water. The female appears to be inoffensive. Mr. 

 Knab doubts whether they ever bite man, as he was never bitten by a specimen, 

 although this is the commonest species of Culex in nearly all the places that he 

 visited. They apparently have not the habit of entering houses and it is possible 

 that they are active in feeding only at night and away from houses where they 

 would seldom molest man. The species, therefore, can not be considered as a 

 dangerous or troublesome one. Eecently Dr. A. Lutz has published a statement 

 confirmatory of Knab's opiny^n regarding the habits of the female, and stating 

 that the mandibular setae are absent in this species. 



Throughout the mainland from Brazil to Mexico, Island of Trinidad, but 

 not on any of the Antilles. 



St. Joseph, Trinidad, June 13, 1905 (A. Busck) ; Cedros, Trinidad, June 31, 

 1905 (A. Busck) ; Trinidad (P. W. Urieh) ; Tabernilla, Canal Zone, Panama, 

 April 36, May 13, July 33, 1907 (A. Busck) ; December 15, 1908 (A. H. Jen- 

 nings) ; Culebra, Canal Zone, Panama, May 7, 1907 (A. Busck) ; Las Cascadas, 

 Canal Zone, Panama, June 1 and 13, 1907 (A. Busck) ; Alhajuela, Canal Zone, 

 Panama, June 7, 1907 (A. Busck) ; Chagres Eiver, Panama, June 7, 1907 (A. 

 Busck) ; Pedro Miguel, Canal Zone, Panama, June 33 and 34, 1907 (A. Busck) ; 

 La Boca, Canal Zone, Panama, July 4, 1907 (A. Busck) ; Taboga Island, 

 Panama Bay, Panama, July 4, 1907 (A. Busck) ; Lion Hill, Canal Zone, 

 19 



