848 MOSQUITOES OF NqeTH AMERICA 



Obiginal Descbiptiox of Stegomyia sexlineata: 



Thorax deep brownish-black, with two median parallel yellow scaled lines and 

 two pairs of lateral pale creamy curved lines on the front of the mesonotum, 

 Abdomen deep brown, with narrow pale creamy basal bands and pure white lateral 

 spots, the last two segments with pure silvery-white basal bands. Legs deep brown; 

 metatarsi and some of the tarsi with basal white bands; knee spot and also a spot 

 on the femora pure white; ungues of $ equal and simple. 



9. Head deep brown, covered with flat black scales, with a median and lateral 

 lines of creamy scales and with dull white scales at the sides; the scales of the 

 median creamy line are of rather different form to those of the rest of the head, 

 numerous black bristles projecting forwards and inwards and a few at the sides; 

 projecting forwards in the middle line between the eyes are a few yellowish bristles; 

 on the back of the head are a few small black upright forked scales. Antennae deep 

 black, unhanded, the basal joint with silvery -white flat scales; clypeus black; palpi 

 black scaled, the apices of the last two segments being white scaled above, and there 

 are also a few white scales on their whole upper surface; proboscis rather long 

 and thin, deep black. 



Thorax deep brownish-black to almost jet-black, densely covered with narrow 

 curved scales, applied to the surface somewhat closely; those on the major area 

 are deep brownish-black, there are two median nearly parallel creamy-yellow scaled 

 lines, which extend right back to the scutellum and which become almost white before 

 reaching it, then two pairs of lateral curved lines of similar colour which die out 

 about the middle of the mesonotum, the innermost pair being slightly the longer; 

 just beneath and in front of the roots of the wings is a white scaled spot and numer- 

 ous pale bristles projecting over their roots; scutellum brown, with small flat black 

 scales, and a few grey ones on the middle of the mid lobe; posterior border-bristles 

 rather pale, five to the mid lobe; metanotum deep chestnut-brown; pleurae black, 

 with patches of pure white scales. 



Abdomen steely black, covered with dusky brownish-black scales; first and second 

 segments unhanded, the third to the sixth with narrow creamy basal bands, the 

 seventh and eighth showing pure silvery-white basal bands, the seventh rather in- 

 complete, all the segments with pure silvery-white lateral spots, which show dorsally 

 on the fifth to seventh segments; these lateral spots are median and their scales 

 rather project ventrally; posterior border-bristles pale golden-brown, longest at the 

 sides of the segments; venter black, the white lateral spots, however, showing very 

 prominently on the venter when the abdomen is empty. 



Legs with the coxae dark with some white scales; femora deep brownish-black, 

 white scaled at the base and partly beneath, apex pure white, and there is also a 

 pure white round spot on one side on its apical half; tibiae deep brownish-black with 

 pallid bristles; metatarsi basally white, those of the hind legs but little more than 

 half the length of the hind tibiae; first tarsal joint of the fore and mid legs basally 

 white, remainder black, in the hind legs the first and second tarsi are broadly banded 

 with white at their base (the banding is apparently not always complete), last two 

 tarsi black; ungues equal and simple. 



Wings rather dusky brown, the veins clothed with brown scales, the lateral ones 

 long but rather broader than in Culex: fork-cells short, the first sub-marginal cell 

 a little longer and narrower than the second posterior cell, their stems about equal 

 and their bases about level; the stems equal to about two-thirds of the length of 

 the cells; sub-costal joins the costal some distance from the bases of the fork-cells 

 and almost level with the supernumerary and mid cross- veins; posterior cross-vein 

 nearly twice its own length distant from the mid cross-vein; fringed brown, rather 

 paler at the base, posterior border scales deep brown, rather long and narrow. 

 Halteres with ochraceous brown stem, fuscous knob with grey scales. 



Length. 4 mm. 



Time of capture. December (Urich) (102). 



Habitat. Trinidad, at Agua Santa. 



Observations. Described from a single perfect $ in beautiful condition. It forms 

 quite a distinct species, coming near /8. notoscripta, Skuse, in thoracic ornamenta- 

 tion, but clearly distinct from it in arrangement and also by the absence of the 

 proboscis band and head ornamentation. I have seen no specimens from elsewhere. 



Description of Female of Aedes sexlineata (Male and Laeva Unknown) : 



Female. Proboscis long and slender, subcylindrical, unifoiin; vestiture 

 black ; setae minute, curved, black, those on labellae more prominently outstand- 

 ing. Palpi about one-fifth the length of the proboscis, slightly thickened by 

 scales at the tips; vestiture black, with a patch of silvery-white scales near 



