76 INSECUTOR INSCITI^ MIJNSTRUUS 



Grabhamia spenceri Blanchard, Les. Moust._, 397, 1905. 

 Ochlerotat'ws spenceri Coquillett. U. S. Dep. Agr., Bur. Ent., 



Tech. Ser. 11, 18, 1906. 

 Grabhamia spenceri Theobald, Mon. Culic, iv, 285, 1907. 

 Aedes spenceri Dyar, Proc. U. S. Nat. Mus., xxxii, 125, 1907. 

 A'edes spenceri Knab, Journ. N. Y. Ent. Soc, xv, 216, 1907. 

 Aedes spenceri Knab, Smith. Misc. Colls., quart, iss., 1, 541, 1908. 

 Grabhamia spencerii Theobald. Mon. Culic, v, 290, 1910. 

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



& W. I., iv, 723, 1917. 

 Aedes spenceri Cameron, Agr. Gaz. Can., v, 557, 1918. 

 Aedes spenceri Cameron, Jn. Am. Med. Vet. Ass., liii, 633, 1918. 

 Aedes spencerii Dyar, Ins. Ins. Mens., vii, 37, 1919. 



This species inhabits the open prairies in Canada, and is 

 easily recognizable by the bicolored wing-scales and the pale 

 dorsal stripe of the abdomen. 



Species 9 



Aedes (Ochlerotatus) idahoensis Theobald. 



Grabhamia spencerii idahoensis Theobald, Mon. Culic, iii, 250, 



1903. 

 Ochlerotatus spenceri Coquillett (in part), U. S. Dep. Agr., Bur. 



Ent., Tech. Ser. 11, 21, 1906. 

 Aedes idahoensis Dyar & Knab, Proc. U. S. Nat. Mus., xxxv, 57, 



1908. 

 Aedes spenceri Cooley (not Theobald), Bull. 109, Mont. Agr. 



Exp. Sta., 153, 1916. 

 Aedes spenceri Cooley (not Theobald), Bull. 112, Mont. Agr. 



Exp. Sta., 73, 1916. 

 Aedes idahoensis Dyar, Ins. Ins. Mens., v, 120, 187, 1917. 

 Aedes idahoensis Howard, Dyar & Knab, Mosq. No. & Cent. 



Am. & W. I., iv. 727, 1917. 

 Aedes idahoensis Dyar, Ins. Ins. Mens., vi, 78, 1918. 

 Aedes idahoensis Cockerell, Journ. Econ. Ent., xi, 199, 1918. 



This species inhabits the limited prairies along river valleys 

 in Colorado and Montana, Idaho, Nevada and eastern Wash- 

 ington, probably extending into southeastern British Columbia. 

 The larvae breed in early spring pools in arid land, and also 

 to a less extent in later pools caused by irrigation or excep- 

 tional rains. 



This is closely allied to spencerii, but inhabits a separate 



