INSECUTOR INSCITI^ MENSTRUUS 7 



Fort Egbert, Alaska, June 2, 1906 (cotypes of borealis Lud.)- 



Aedes pionips Dyar. 



Aedes pionips Dyar, Ins. Ins. Mens., vii, 19, 1919. 



Well distributed throughout the region, though never abun- 

 dant. The adults are late in issuing, larvse being found, to- 

 gether with pullatus, after most of the other forms had 

 emerged. The species occurred rarely in the Skeena flood- 

 pools, to judge by captured adults. No actual breedings of 

 pionips were obtained from these pools. 



The mesonotum has usually a clear yellow ground color, but 

 at Atlin specimens occurred with the mesonotum gray. 



Total, 122 specimens: Prince George, British Columbia, 

 May 9, 13, 25-28, 1919; Terrace, British Columbia, August 

 12-14, 1919 ; Kwinitsa, British Columbia, May 25, 1919 ; Skag- 

 way, Alaska, June 24, 27, 28, 29, 30, July 1, 2, 1919; Atlin, 

 British Columbia, July 22, 25, 1919; Carcross, Yukon Terri- 

 tory, July 27, 1919 ; White Horse, Yukon Territory, July 3, 

 16, 17, 18, 1919; Horse Falls, Yukon Territory, July 13, 1919; 

 Dawson, Yukon Territory, July 7-13, 1919. 



Aedes diantaeus Howard, Dyar & Knab. 



Aedes diantaeus Howard, Dyar & Knab, Mosq. No. & Cent. Am. 

 & W. I., iv, 758, 1917. 



This species occurred not uncommonly in the lower Skeena 

 Valley, issuing from the flood-pools in July. The female 

 adults generally had the mesonotal stripes united in the manner 

 of punctor, which they consequently much resembled. They 

 are a little smaller and blacker, less robust, the legs having a 

 blue-black appearance different from the brown-black of 

 punctor. 



The males do not swarm, but seize the females when 

 approaching to bite. The males may be attracted to the presence 

 of warm-blooded animals as varipalpus is ; but no swarms 

 were observed as with that species. While sitting on a log in 

 dark woods at Terrace, B. C, in the forenoon, the weather 

 being cloudy, a male and female were noted in the air, grap- 

 pling. They flew to a neighboring twig and alighted, the fe- 



