352 MOSQUITOES OF NORTH AMERICA 



scales and mottled with grayish ones; the second segment with a broad white ring 

 before the middle; apical half of the palpi clothed with long hairs; occiput clothed 

 with gray and pale brown scales, the margin of the eyes white-scaled, the usual up- 

 right dark forked scales; mesonotum clothed with light yellow-brown and grayish 

 scales, without distinct lines or pattern; abdomen dusky-scaled above, the segments 

 broadly banded with white basally; on the sixth and seventh segments the bands ex- 

 tend along the lateral margins to the apices of the segments; eighth mostly black- 

 scaled above; beneath the abdomen is light-scaled without bands, ciliation of the 

 abdominal margin pale, long, and abundant; veins of the wings clothed with pale 

 brownish long and narrow scales, those along the costa black; legs blackish-scaled, 

 with lighter mottling on the femora and tibiae; the tarsi show a faint bronzy luster 

 and are not ringed; under surfaces of the femora pale-scaled; tibiae paler scaled on 

 the inner side. Length, 3 mm. 



Three specimens. New Amsterdam, Dutch Guiana, February 17, 1908 (Dr. J. 

 Aiken) . 



Type— Cat. No. 11977, U. S. N. M. 



We realize the undesirability of describing species of Culex from the male sex 

 alone, on account of the diflSculty of ever associating the proper female; but in this 

 case Doctor Aiken has communicated to us the larva, which makes future identifica- 

 tion of the female easy. The larva is almost the exact counterpart of our Culex 

 regulator, described from Santo Domingo, but the male adult differs strikingly from 

 the male of regulator, so that there is no question but that the two forms are distinct 

 species. It is proper to state that the larva sent us by Doctor Aiken Is a whole larva, 

 not the skin from a bred specimen, and therefore the authority for the association 

 rests with him. 



Named for Dr. J. Aiken, who collected the specimens and has kindly sent us a 

 series of species from Dutch Guiana. 



OBIOINAI. DeSCBIPTION of CUI-BX QTJINQ0EFASCIAT0S RACE DIPSETICUS: 



In ... . parts of the United States and the western coast of Mexico a 



modified form of genitalia is seen, representing a distinct race of the species. We are 

 not acquainted with the line of separation of the forms, as our material is insufficient. 

 Our specimens of the race, for which we propose the name dipseticus, are from Indio 

 and Coachella, Cal. (in the Salton Sink), La Paz, Baja California, Acapulpco and 

 Salina Cruz, Mexico 



In the genitalia of the race dipseticus, the first branch of the harpagones is not 

 especially elongated. The other characters remain essentially the same, including 

 the fiat and pointed condition of the second plate. 



Type — ^No. of the race dipseticus, 12229, U. S. Nat. Mus. 



Obioinai, Desceiption of CutEX GOTJGHn (male only) : 



Male. — Head dark brown, clothed with narrow-curved pale scales and small flat 

 pale lateral ones, black upright forked scales behind; antennae banded brown and 

 grey with brown plume hairs, flaxen at the base; palpi deep brown, acuminate, last 

 two segments nearly equal, with black hairs, also the apical region of the ante- 

 penultimate, a pale band near the base of the palpi and the penultimate segment 

 with a line of white scales beneath, and some beneath at base of the apical one. 



Thorax deep brown with golden brown scales, pales behind and black chaetae; scu- 

 tellum pale brown, like the neighbouring region of the metanotum, and with narrow- 

 curved pale scales and deep brown border bristles, seven to the mid lobe; metanotum 

 pale ochreous brown. 



Abdomen with the first segment dark, nude except for two small patches of black 

 scales, with long pale brown hairs on each side, shorter ones in the middle; second 

 segment black with a small median basal triangular white spot, third, fourth, and 

 fifth segments with basal creamy bands, the sixth and seventh with the bands spread- 

 ing down each side to the posterior borders of the segments, eighth segment with 

 basal lateral creamy spots only; hairs, long, dense, golden. 



Legs deep brown, femora grey beneath, knee spot pale and small, a pale apex to 

 hind tibiae, fore and mid ungues unequal, unlserrate, hind equal and simple. 



Wings with the first fork-cell longer and narrower than the second fork-cell, its 

 base nearer the base of the wing. Its stem nearly half the length of the cell, stem 

 of the second fork-cell as long as the cell; posterior cross-vein about one-and-a-half 

 times Its own length distant from the mid cross-vein. 



Length.^-i.5 mm. 



Baiitat. — Onderstepoort (Dr. Theiler). 



Observations. — .... one male .... A rather obscure species of fatigans type, 

 but can be easily told .... by the white scaled line on the palpl, which Is ventral 

 and very marked In the male. 



