CTJLEX DERIVATOR 291 



The following is an abstract of the table : 



1. Antennae with the tuft outwardly placed, the part beyond slender. . 5 



5. Air tube four times as long as wide or over 7 



7. Anal appendages four, normal 8 



8. Air tube with four to ten i>aired tufts along the posterior line in a 



straight row, none displaced, or the hairs obsolete or absent. 18 



18. Air tube without a crown of spikes, smooth throughout 19 



19. Air tube with long, well-defined tufts 20 



20. Body splcular-pilose 21 



21. Five tufts on posterior margin of tube subequal in length, short; 



lateral abdominal hairs in twos on segments 3 to 5 22 



22. Air tube 11 X 1; upper head hair double; pecten of air tube moder- 



ate derivator 



Desckiption of Female, Mau:, and Laeva of Culex deeivatoe: 



Female. — Proboscis rather long and slender, slightly enlarged at tip, labellae 

 pale, conically tapered; vestiture black, with bronzy and blue reflection; setse 

 small, curved, black, those on labellae more prominently outstanding. Palpi 

 slender, over one-fourth as long as proboscis, blackish scaled. Antennae moder- 

 ate, the joints subequal, rugose, pilose, black, hairs of whorls sparse, moderate, 

 black; tori subspherical, with a cup-shaped apical excavation, brownish luteous, 

 darker on inner side. Clypeus rounded triangular, blackish, nude. Eyes black. 

 Occiput blackish, clothed with narrow, curved pale-yellowish scales on vertex, 

 flat whitish ones on lower part of sides ; margin of eyes silvery white ; numerous 

 erect, forked, black scales on nape. 



Prothoracic lobes elliptical, remote dorsally, brown, clothed with pale scales 

 and dark bristles. Mesonotum brown, with two narrow, impressed, bare lines ; 

 vestiture of narrow, curved golden-brown scales, anterior and lateral margins 

 and region around ante-scutellar space with paler yellowish scales, a line on 

 each side of ante-scutellar space extending to middle ; bristles stiff, brown. Scu- 

 tellum trilobate, clothed with pale shining scales, each lobe with a tuft of dark- 

 brown bristles. Postnotum elliptical, prominent, brown, nude. Pleurae and 

 coxae pale green, with patches of elliptical, flat whitish scales and rows of brown 

 bristles. 



Abdomen subcylindrical, depressed, truncate at tip ; dorsal vestiture of black 

 scales without metallic luster, a row of lateral triangular apical segmental white 

 spots; venter greenish, vestiture of dull-white scales, last segment dark at base; 

 tips of segments with rather coarse brown hairs. 



Wings rather narrow, hyaline; petiole of second marginal cell over half as 

 long as its cell, that of second posterior cell about equal to its cell ; basal cross- 

 vein distant slightly more than its own length from anterior cross- vein ; scales 

 of veins long, dense, linear, brown, with a blue reflection on costa, densest on 

 forks of second vein. 



Legs moderate, femora whitish beneath, except at tip ; knees silvery white ; 

 tibiae and tarsi black, with a bronzy and blue reflection. Claw formula, 

 0.0-0.0-0.0. 



Length : Body about 4 mm. ; wing 4 mm. 



Male. — Proboscis moderate, gradually swollen towards apex, black scaled. 

 Palpi exceeding proboscis by more than length of last joint, end of long joint 

 and the last two joints slightly enlarged and bearing long, dense, black hairs ; 

 vestiture entirely bronzy black. Antennae plumose; last two joiats long and 

 slender, rugose, pilose, black, the others short, whitish, with black rings at inser- 

 tions' of hair-whorls ; hairs of whorls long, dense, black, not very closely placed. 

 Coloration similar to the female. Wings narrower, the stems of -the fork-cells 

 slightly longer, vestiture a little less abundant. Abdomen elongate, depressed, 

 second and third segments without bands, fourth to seventh with very narrow 

 apical white bands, eighth with a broader apical band; lateral ciliation abun- 



