CULEX TRACHYCAMPA 329 



stout, rounded, with a crown of dense spines ; outer limb slender, curved, blade- 

 like. Harpagones divided into a number of lamellae, the angles of which project 

 as stout teeth. Basal appendages approximate, rounded, bearing several stout 

 setaa. 



Larva, Stage IV (plate 96, fig. 311). Head rounded, widest through eyes, 

 somewhat broader than long; antennae long, stout, a large tuft at outer third, 

 the part beyond slender, the shaft spinose ; upper pair of dorsal head-hairs in 

 fours, lower in threes, both long, ante-anteunal tufts multiple. Skin of body 

 very minutely spiculate, the lateral hairs in fives on first abdominal segment, in 

 threes on second, in twos on third to sixth; lateral comb of eighth segment of 

 many spines in a large transverse patch. Air-tube six times' as long as wide, 

 slightly tapering outwardly ; pecten of short teeth, evenly spaced, reaching basal 

 two-fifths ; three tufts on tube, the basal one of three hairs well beyond end of 

 pecten, the outer two two-haired, the middle one moved laterally out of line and 

 situated slightly beyond middle of tube ; terminal hooks minute. Anal segment 

 about as long as wide, ringed by the plate, which is slightly spinose along its pos- 

 terior border ; dorsal tuft of four hairs of different lengths on each side ; lateral 

 hair small, single; ventral brush large, confined by the chitinous ring. Anal 

 gills about twice as long as the segment, tapering, rather sharply pointed. 



The larvfe live in rain-water collected in bamboo-joints and in dirty ground- 

 puddlgs. Mr. Eusck found them in bamboo-joints on six occasions, once in 

 water in a hole in a cut banana-stem, once in the crotch of a tree 8 feet from the 

 ground, once in an old barrel and once in foul, dark water in a swamp ; Mr. Jen- 

 nings found them in old tins, in a cistern in an old fort, in bamboo-traps, in a 

 hole in a rock along a stream, and in a pool in a ground-cut. 



Panama. 



Tabernilla, Canal Zone, May 9, 16, 21, June 4, July 18, 1907 (A. Busck) ; 

 December 22, 1908, April 14, 1909 (A. H. Jennings) ; Pedro Miguel, Canal 

 Zone, May 16, 1907 (A. Busck) ; Ahorca Lagarto, Canal Zone, June 12, 1907 

 (A. Busck) ; Lion Hill, Canal Zone, July 26, 1907 (A. Busck) ; Bas Obispo, 

 Canal Zone, December 12, 1907 (A. H. Jennings) ; San Pablo, Canal Zone, 

 December 24, 1907 (A. H. Jennings) ; Caldera Island, Porto Bello Bay, Jan- 

 uary 4, 1908, February 13, 1909 (A. H. Jennings). 



Culex equivocator is very closely allied to C. extricator, but differs in habits, 

 inhabiting tree-holes and occasionally ground-pools where foul, whereas C. 

 extricator lives exclusively in crab-holes. We are able to distinguish both adults 

 and larvas on minor characters, and so keep them separate. The species prob- 

 ably has a wider distribution than indicated above. Theobald's description of 

 Culex lateropunctata from Supenaam, British Guiana (Monog. Culicid., iv, 458, 

 1907), apparently agrees with our Culex equivocator, and may be the same 

 species, but we can not make a positive reference one way or the other, as no 

 mention is made by Theobald of the characters of the larvae, nor, which is in this 

 case especially important, of the breeding-habits. 



CULEX TRACHYCAMPA Dyar & Knab. 



Culex trachycampa Dyar & Knab, Can. Ent, xli, 101, 1909. 



Origin Ai. Description of Cuxex trachycampa: 



Proboscis black, moderately long and slender, hardly swollen at the tip. Palpi 

 black-scaled. Mesonotum blackish, clothed with dark bronzy-brown scales; abdomen 

 subcylindrical, depressed, truncate at tip, dark-scaled above with coppery lustre, 

 beneath with distinct white basal segmental bands. Legs blackish with bronzy 

 lustre, the femora pale beneath to near the tip. Wings rather broad, the outstanding 

 scales of the veins linear and narrowly ovate, denser on the forks of the second and 

 fourth veins. Claws simple in the female. Length about 2.5 mm. 



