84 



a rather characteristic appearance being "thickly fusiform, rounded, one side flat- 

 tened, the ante-micropylar end more pointed than the other". 



Geographical distribution: 0. prodotes has hitherto only been found in 

 North America. Its range "is to the north along the higher mountains of the Rock- 

 ies into the Yukon Valley, where it is the second species in abundance". (DyAR 

 1920 p. 9). In U. S. A. it is indicated as a "high altitude species". 



13. O. rusticus (Rossi). 



Aedes diversus. Theob. 



Tab. XII. 



Description. Female: Proboscis moderate, subcylindrical, flattened, uniform, 

 black, covered with scattered yellowish-white scales; nearest the apex and labella? 

 black; seta? minute, black, curved, those on the labella? more prominently outstan- 

 ding. Palpi stout, rather long, about one-fourth of the proboscis; vestiture of black 

 scales with many pale ones; seta?, few, long, black. Antenna 1 with the joints sub- 

 equal, rugose, pilose, black; second joint somewhat thickened, tori subspherical with 

 a cup-shaped excavation outwards, covered with small, broad whitish scales, on 

 the inner side black. Clypeus shortly conical, prominent, convex, black, nude. Eyes 

 bronzy black. Occiput covered with dense, narrow, yellowish-brown scales on the 

 vertex and many forked upright ones, a large patch of golden brown ones on each 

 side close to the eyes; bristles along margin of eyes black. 



Prothoracic lobes elliptical, well separated, black, covered with yellowish- 

 white scales and many long, black bristles. Mesonotum black with a dark, very 

 small middle line, two broad median dark lines and two small lateral dark lines 

 behind; between these lines stripes of yellowish-brown scales. Scutellum trilobate, 

 black, clothed with narrow, curved brown scales, each lobe with a large group of 

 long, yellowish-brown hairs. 



Postnotum convex, black, nude. Pleura? black, coxa? black, clothed with narrow, 

 elliptical, flat yellowish-while scales and short pale bristles. 



Abdomen flattened, broad, the posterior segments tapered; dorsal vestiture of 

 blackish-brown scales, each segment with a basal band of creamy white scales, 

 which spread out in the middle, forming together a more or less conspicuous 

 whitish middle line, and on the sides, where they form triangular creamy spots; 

 the seventh segment almost white with two dark spots; posterior borders with pale 

 golden bristles. Venter almost entirely clothed with pale creamy scales. 



Wings large, veins covered with dark brown scales and pale lateral ones; 

 first submarginal cell much longer and narrower than second posterior cell, its 

 stem slightly shorter than the cell; stem of the second posterior cell shorter than 

 the cell, the forks of which widely diverge; supernumerary and mid cross-vein in 

 a straight line; the posterior cross-vein about half its own length distant from the 

 mid cross-vein; fringe brown, halteres ochraceous, with pale scales on the knob. 



Legs: Femora creamy-yellow, especially beneath, with some dark scales above; 



