1034 MOSQUITOES OF NORTH AMERICA 



thorax, indistinct in others and in good specimens; the pale lines run as follows: 

 two parallel ones in the middle running along about half the length of the meso- 

 notum, the other two slightly curved, not far distant from the central ones and 

 longer; the whole mesonotum covered with long, scattered, golden, curved, hair-like 

 scales; scutellum pale greyish-brown; metanotum chestnut-brown with a narrow, 

 dark median line; pleurae brown with grey tomentum. 



Abdomen blackish-brown clothed with scattered golden hairs, when viewed facing 

 the light shiny-black and metallic. 



Legs long, ochraceous-brown with dark brown scales, especially towards their 

 extremities, ventral surface of femora ochraceous-brown; there is also a pale knee- 

 spot on all the legs and a pale spot at the end of the hind tibiae. 



Wings with the veins edged with thin, longish, brown scales, mid cross-vein in 

 advance of the supernumerary and posterior cross-veins, the latter distant from the 

 mid more than its own length; stems of the two fork-cells about equal, first sub- 

 marginal cell a little over twice the length of its stem and longer than the second 

 posterior cell, base of the first cell a little nearer the base of the wing than that of the 

 second posterior cell; fringe all brown. 



Halteres with ochraceous stem and a large globular dusky knob. 



Length of body, 5.5 to 6 mm., with proboscis, 10 mm.; of wings, 5.5 mm.; of hind 

 legs, 12 mm. 



Habitat. Lake Simcoe, Ontario, Canada (E. M. Walker). 



Time of capture. September. 



Observations. This species closely resembles the European A. bifurcatus, but 

 differs from it in regard to the head ornamentation, the browner appearance of the 

 thorax and the relative positions of the cross-veins as shown in Figure 60. When 

 viewed under the microscope in some lights there will be seen four grey thoracic 

 stripes which are also characteristic, especially when the thorax is rubbed. No 

 males were unfortunately sent. All the specimens were taken from beds of reeds 

 close to the low marshy shore of Lake Simcoe. I should not be surprised if this 

 proved to be Wiedemann's A. ferruginosus (Auss. Zwei. Ins. p. 12, 1828) from New 

 Orleans, there being a striking resemblance in the thorax. 



Description of Female of Anopheles walkebi (Male and Laeva Unknown) : 



Female. Proboscis long, straight, slender; labellae long, lanceolate, brown, 

 with small outstanding black setse; vestiture appressed, black. Palpi slightly 

 shorter than the proboscis, uniform, slender, clothed with narrowly elliptical 

 scales, roughened on basal third, black, with dull silvery-white rings at middle of 

 long joint, at the articulations of last two joints and at tip of last one, outer por- 

 tion of long joint and last two joints with rather coarse bristles. Antennae moder- 

 ate, filiform, the joints subequal, rugose, black, with long pile, a few silvery- 

 white scales on second and third joints ; hairs of whorls sparse, black, short ; tori 

 subspherical, with a cup-shaped apical excavation, small, blackish. Clypeus 

 elongate elliptical, brown, nude. Eyes well separated, black. Occiput with a 

 median groove, blackish, integument at margins of eyes white, vestiture of erect 

 triangular pale scales, their stems dark, some slender recumbent whitish scales 

 anteriorly, a tuft of long white setae projecting forward between the eyes ; a row 

 of black bristles along margins of eyes. 



Prothoracic lobes lateral, small, elliptical, with some coarse brown bristles. 

 Mesonotum narrow, elongate, brownish-gray, slightly lighter pruinose in two 

 narrow stripes on anterior half ; vestiture of short, sparse, golden brown hair-like 

 scales, slightly denser medianly ; bristles at roots of wings coarse, brown. Scu- 

 tellum collar-like, luteous, with a row of rather dense, long brown bristles. 

 Postnotum pale brownish gray, shining, nude. Pleurae brown, pruinose ; coxfe 

 luteous, with a few short hairs. 



Abdomen subcylindrical, somewhat depressed, truncate at tip, brownish-gra}^, 

 slightly rugose; vestiture of numerous short brown bristles with golden luster. 



Wings (plate 41, fig. 21) moderate, hyaline; petiole of second marginal cell 

 much shorter than its cell, that of second posterior cell about as long as its cell ; 

 basal cross-vein distant about its own length from anterior cross-vein ; scales of 

 veins long and narrow, nearly linear, brownish black, rather uniformly dis- 

 tributed, only slightly denser and darker in the region of the cross- veins and at 

 the bases of the fork-cells. Halteres brownish. 



Legs long and slender; vestiture blackish brown, knees and apices of tibise 

 paler. Claw formula, 0.0-0.0-0.0. 



