506 MOSQUITOES OF NORTH AMERICA 



Original Description of Culex pertuebans : 



Foem. Fusca; proboscis nigra, fascia lata sordide albida; palpi nigri, basi tes- 

 tacei; antennae nigrae; scutellum cinereo vittatum; pectus ferrugineum; abdomen 

 fasciis ventreque cinereis; pedes testacei, femoribus apice nigris, tibiis nigro tri- 

 fasciatis, tar sis nigris albo cinctis; alae subcinereae, venis testaceis. 



Brown. Proboscis black, long, slender, straight, with a broad dingy whitish 

 band in the middle. Palpi black, testaceous at the base. Antennae black. Scu- 

 tellum with a cinereous stripe. Pectus ferruginous. Abdomen with a cinereous band 

 on the fore border of each segment; under side cinereous. Legs testaceous; femora 

 with black tips; tibiae with three black bands; tarsi black, with a white band at the 

 base of each joint. Wings grayish; veins testaceous, very thickly ciliated; plumes 

 brown. Halteres testaceous. Length of the body 3 lines; of the wings 5 lines. 



United States. 



Description of Femat.k, Mat.e, and Larva of Mansonia perturbans: 



Female. Proboscis moderate, not enlarged apically ; labellae moderate ; vesti- 

 ture of broad roughened scales, at base narrowly and on apical two-fifths black, a 

 broad pale-scaled band beyond base with a few black scales intermixed ; labellae 

 pale; setae small, dark, curved, somewhat more prominent on labellae. Palpi 

 about one-fourth as long as proboscis, stout, truncate, the Rmall terminal joint 

 concealed in the vestiture ; with many stiff outstanding bristles, black scaled, a 

 few pale scales intermixed. Antennae filiform, moderate, joints of shaft sub- 

 equal and rather short, rugose, blackish, densely clothed with pale cilia; tori 

 globose, brownish, with a small group of flat white scales on inner side; hairs of 

 whorls sparse, black. Clypeus broad, roundedly triangular, subtruncate before, 

 nude, dark brown. Eyes bronzy brown. Occiput sordid brown, rather thickly 

 clothed with narrow, curved, shiny pale ochraceous scales and numerous slender, 

 upright, forked black ones, densest posteriorly and sublaterally ; margin of eyes 

 and cheeks more densely whitish scaled; bristles moderate, blackish, some pale 

 brown ones projecting at vertex. 



Prothoracic lobes small, remote, similarly colored to mesonotum, setose, and 

 with lanceolate, shining pale scales. Mesonotum chestnut brown, clothed with 

 small narrow, curved black scales and large, lanceolate, shining pale ochraceous 

 ones, rather sparse, leaving the integument largely visible; dark scales pre- 

 dominating on the disk, divided by two longitudinal, bare, slightly impressed 

 stripes, and in a large patch on either side above roots of wings ; the pale scales 

 form an ill-defined broad lateral margin, which widens and divides posteriorly 

 to inclose the dark patch and forms a border about the antescutellar bare space ; 

 bristles rather numerous, dark before, pale yellowish on the disk and above roots 

 of wings. Scutellum trilobate and clothed with narrow, curved, pale ochraceous 

 shining scales ; central lobe more prominent, a group of long pale setae on each 

 lobe. Postnotum elliptical, nude, dark brown. Pleurae and coxse pale brownish, 

 with patches of flat, appressed whitish scales ; two groups of dense pale-tipped 

 bristles below wings. 



Abdomen subcylindrical, flattened, slightly tapering towards . tip, the last 

 segment rather squarely truncate ; membrane sordid brownish, clothed dorsally 

 with bluish-black scales, and white ones at the sides forming a row of basal seg- 

 mentary triangular patches; more or less distinct narrow basal whitish bands 

 on basal segments ; first segment black scaled with numerous long pale hairs ; 

 venter mostly black scaled, with a few white ones intermixed which tend to form 

 basal transverse bands. 



Wings rather broad; second marginal and second posterior cells much longer 

 than their petioles, the petiole of the second marginal about half as long as 

 the cell; cross- veins short, basal cross-vein more than its own length distant 

 from anterior cross-vein ; membrane hyaline, veins brownish, vestiture of very 

 dense, rather broad, spatulate, black and sordid white scales intermixed, the 

 black ones the more numerous; scales becoming broader and denser towards 

 apex of wing ; fringe blackish. Halteres entirely pale. 



