14 INSECUTOR INSCITI^ MIlNSTRUUS 



not well understood. On going over the old material I find 

 several specimens with pale golden, unhanded mesonotum, 

 much as in one form of hexodontus. However, no determina- 

 tion can be made, as the mosquitoes of the Selkirks and Sierras 

 are quite different, several eastern forms occurring in the for- 

 mer. Larvse and males will have to be compared, which are 

 not at hand in the Kaslo material. 



Specimens before me, referable to hexodontus, have been 

 taken as follows : Fallen Leaf Lake, Lake Tahoe, California, 

 June 4 to 24. 1916 (H. G. Dyar) ; Tahoe Tavern, Lake Tahoe, 

 California, June 20, 1915 (A. K. Fisher) ; Summit, Placer 

 County, California, July 3 to 5, 1916 (H. G. Dyar) ; Gold 

 Lake, Sierra County, California, alt. 6,582 feet, July 20, 1916 

 (H. G. Dyar) ; Gold Lake Camp, Plumas County, California, 

 July 19 to 22, 1916 (H. G. Dyar) ; Hoquiam, Washington, 

 May 27, 1904 (H. E. Burke). 



Aedes increpitus Dyar. 



This species belongs to the cantans group, in which the adults 

 often are indistinguishable by coloration, but the species sepa- 

 rate easily by the male genitalia and larvse. In the east there 

 are three species, stimulaiis Walker, iitchii Felt & Young, and 

 abfitchii Felt, the former breeding in river pools and having a 

 short-tubed larva, the two latter breeding in woodland pools 

 and having long-tubed larvae. Fitchii and abfitchii have a ten- 

 dency to a golden coloration of the mesonotum, especially on the 

 shoulders ; stimulans is grayer. There is also a species, sansoni 

 Dyar & Knab, described from Banff, Alberta. Of this no larva 

 is known ; the male genitalia agree with abfitchii. Mr. Knab 

 and myself associated as sansoni specimens from Kaslo, British 

 Columbia, of which only females and larvae are known ; the 

 larvae agree with abfitchii. It is possible, however, that at both 

 Banff and Kaslo there is more than one species of the cantans 

 group. However, on the showing made, sansoni must be con- 

 sidered a synonym or a western form of abfitchii. 



Another form, vittata Theobald, was described from Pecos 

 Canyon, New Mexico. Males and females were taken, but 

 the male genitalia have not been made known. A wrong larva 



