INSECUTOR INSCITI^ MENSTRUUS 21 



River, Ontario, June 30, 1903 (W. J. Wilson) ; it is large and 

 strongly marked, yet looks more like this than piouips. 



Aedes decticus Howard, Dyar & Knab. 



A'cdes decticus Howard, Dyar & Knab, Monog., iv, 737, 1017. 

 A'cdes trichurus Howard, Dyav & Knab (in part, not Dyar), 



Monog., iv, 762, 1917. 

 A'cdes lazarensis Dyar (not Felt & Young), Ins. Ins. Menstr., vi, 

 78, 1918. 



The type of decticus is a single female, strongly and aber- 

 rantly marked. The four black spots on the head are distinct, 

 but they may be faint, confused or absent. The coloration is 

 very variable, but usually characteristic. A female from White 

 River, recorded in the monograph under trichurus, is this spe- 

 cies. The male genitalia tabulated by me as lasarensis belong 

 to decticus. 



This species, like intrudens, extends slightly beyond the 

 Canadian region, having been taken in Plattsburg, New York, 

 and St. Paul. Minnesota. In spite of its wide range, the species 

 was never clearly recognized, but was confused with other 

 things. It is quite recognizable, however, when once appre- 

 hended. 



The larva is close to that of lacarensis, being smaller and 

 frailer. The anal segment has the plate without sharp lateral 

 edge, thinning out below and obsoletely encircling the segment. 



Two hundred and thirty-four specimens were obtained as 

 follows: White River, Ontario, June 13-15, 1918; Nipigon, 

 Ontario, June 26, 1918; Dryden, Ontario, June 27-July 2, 

 1918: Kenora. Ontario, July 2, 1918; Winnipeg Beach, Mani- 

 toba, July 4-5, 1918; Red Deer, Alberta, July 30-31, 1918; 

 Lochearn, Alberta, August 5-7, 1918; Lamoral, Alberta. Au- 

 gust 6, 1918. 



Besides these, I have specimens from Plattsburg, New York, 

 April 21, 1905 (H. G. Dyar) ; EHzabethtown, New York, April 

 25, 1905 (H. G. Dyar) ; Winnipeg, Manitoba, June 22, 1907 

 (F. Knab) ; Aitkin County. Minnesota, May U, 1916 (C. W. 

 Howard); St. Paul, Minnesota, May, 1916 (C. W. Howard). 

 A single specimen, taken on Albany River by Mr. Awrey, 



