AEDES INFIRMATUS 781 



Abdomen moderate, anterior segments shorter; lateral hairs double on first 

 segment, single on the succeeding ones ; tracheal tubes very narrow, also narrow 

 within the breathing-tube. Air-tube slender, slightly bulging on basal half, 

 three and a half times as long as wide ; pecten of few teeth, coarse but even, 

 occupying basal third, followed by a single ample hair-tuft towards middle; 

 single tooth a stout spine, wide at base, with three basal teeth. Lateral comb 

 of eighth segment of seven or eight scales in a row; single scale long, tapered 

 to a point, fringed with spinules the whole length. Anal segment much broader 

 than long, ringed by the plate ; dorsal tuft a long hair and brush on each side ; 

 ventral brush well developed, situated on the posterior aspect of the segment, 

 not exceeding the barred area; anal gills very long, six or more times as long 

 as the segment, gradually tapering to a sharp point, partially segmented by a 

 series of slight constrictions and with a stout distinct central trachea. 



The larvas live in temporary ground-pools resulting from rains. The eggs 

 probably hibernate, but they do not hatch in the snow-water of early spring. 

 The larvae appear at intervals after rains, eggs hatching whenever the conditions 

 are favorable. The females do not appear to be attracted by man and perhaps 

 do not suck blood. Professor Smith says that the larvae were first found in a 

 woodland pool. They were at once recognized as distinct by the unusually long 

 anal gills, the very small breathing tube and the habit of remaining close to the 

 bottom. 



" While in confinement the wrigglers never rose voluntarily to the surface, 

 and when disturbed sailed rather than wriggled upward, descending immediately 

 when quiet was restored. So inconspicuous and transparent are they, that a Jar 

 containing them would be set aside as empty unless critically examined, and 

 this, together with their habit of hiding among leaves at the bottom of pools, 

 renders them difficult to secure. * * The record indicates continuous breeding 

 from the middle of July to the end of September." 



]\Ir. Knab in Costa Eica found the larvae associated with Psorophora posti- 

 catus, Aedes serratus, and Psorophora cilipes. 



Southeastern United States to Central America; Trinidad, West Indies. 



New Brunswick, New Jersey, August 1 (through J. B. Smith) ; Washington, 

 District of Columbia, June 15, 1903 (W. V. Warner) ; Baton Eouge, Louisiana 

 (J. W. Dupree) ; Scott, Arkansas, July 11, 1908 (J. K. Thibault, Jr.) : Las 

 Loras, near Puntarenas, Costa Eica, September 9, 1905 (F. Knab) ; Trinidad, 

 West Indies, June, 1905 (A. Busck) . 



Aedes dupreei is widely distributed, but rare and difficult to find, so that 

 unless careful collecting is done it is not taken. 



AEDES INFIRMATUS Dyar & Knab. 



Culicelsa conflrmatus Dyar (not Lynch Arribaizaga), Journ. N. Y. Ent. Soc, xiii, 



186, 1905. 

 Aedes infirmatus Dyar & Knab, Journ. N. Y. Ent. Soc, xiv, 190, 197, 1906. 

 Aedes infirmatus Dyar, U. S. Dept. Agr., Bur. Ent., Circular 72, 5, 1906. 

 Aedes infirmatus Thibault, Proc. Ent. Soc. Wash., xii, 18, 1910. 



Okiginal Description of Aedes infirmatus: 



"With the characters given in the table. The specimens were obtained by Dr. 

 Dupree at Baton Rouge, La., and determined by Mr. Coquillett as " Culex con- 

 firmatus Arrib.," a determination which appears to us too improbable to accept. 



The following is an abstract of the table : 



1. Air tube with the tuft beyond the pecten 8 



S. Pecten of the air tube with evenly spaced teeth 13 



13. Comb scales more numerous to many in a patch 21 



21. Anal segment ringed by the plate 22 



22. Air tube twice as long as wide or less, pecten of 12-14 teeth 26 



26. Scales of comb feathered on the sides with central thorn; pecten 



reaching half the length of tube; body glabrous infirmatus 



