16 INSECUTOR INSClTlyTi MENSTRUUS 



1919 (western forms of fitchii and stimulans) ; Prince George, 

 British Columbia, May 28 {e. x crucians) , September 9, 1919; 

 Terrace, British Columbia, August 12, 13, 14, 1919 ; Skagway, 

 Alaska, July 28, 1919; Bennett, British Columbia, July 28, 

 1919; Taku, British Columbia, July 22, 1919; Atlin, British 

 Columbia, July 22-25, 1919 ; Carcross, Yukon Territory, July 

 21, 27, 1919 ; White Horse, Yukon Territory, June 26-30, July 

 1-5, 16, 17, 18, 1919 ; Tahkeena River, Yukon Territory, July 

 19, 1919; Hootalinqua, Yukon Territory, July 6, 1919; Tan- 

 talus Mine, Yukon Territory, July 6, 1919 ; Byer's Camp, 

 Yukon Territory, July 6, 1919 ; Big Salmon, Yukon Territory, 

 July 15, 1919; Carmack's, Yukon Territory, July 14, 1919; 

 Horse Falls, Yukon Territory, July 13, 1919; Selkirk, Yukon 

 Territory, July 13, 1919; Dawson, Yukon Territory, July 8-11 

 (mercurator) , 20 {Htchii), 1919. 



Aedes callithotrys, new species. 



Female: Proboscis black; head brownish yellow, a darker 

 patch on each side, followed by flat white scales below. Meso- 

 notum bronzy yellow scaled ; a band of dark brown scales in 

 the middle. Abdomen with black scales, transverse segmental 

 and longitudinal median dorsal white lines, cutting the black 

 into squares, sparsely dusted with white scales ; venter pale, 

 with a broken median black line. Wing-scales black and white, 

 rather evenly mixed. Legs with femora and tibise with many 

 white scales ; tarsi black, the joints dull white at base and apex. 



Male : Mesonotum and abdomen all yellowish white scaled. 



Genitalia : Side pieces three times as long as wide, conical ; 

 clasp with long terminal spine ; apical lobe small, conical, haired 

 like the rest of the surface ; basal lobe expanded-tubercular, 

 with many short setze, those along the inner margin somewhat 

 stouter than the others, none developed into a spine. Harpes 

 and unci normal. Harpagones with rather short stem, bearing 

 several closely placed setae before tip; filament rather short, 

 shortly sickle-shaped. Basal appendages moderate with five 

 or six terminal spines. 



Types, male and female. No. 22616, U. S. Nat. Mus. ; White 



