6. 
10. 
EM. 
12. 
13: 
14, 
15. 
16. 
Li. 
i8. 
19. 
SPECIES OF CULEX AND ALLIED GENERA. 257 
Middle tibiae with a whitish lateral stripe (fig. 4, 4); abdominal 
bands broadest in middle ; band of proboscis broad and ill-defined 
4, duttonz. 
Middle tibiae unstriped; abdominal bands of equal breadth 
throughout ; band of proboscis narrower and more clearly 
defined te ane Afr Me hoe ae oe mae 6. 
Femora not marbled ... acs ase 38h ace .. O. thalassius. 
Fa marbled (t.¢e., with dark and light scales interspersed) 
6. somalensis. 
Large species (usually 7 mm. or more in length); legs spotted 
7. ligripes. 
Medium-sized or small species ; legs not spotted ... Soe aise 8. 
Legs striped somewhat as in Ochlerotatus ochraceus (on the fore 
legs the pale stripe is more or less broken up into spots, recalling 
Culex tigripes) (fig. 4,¢) ... sas oe ae os. «Sa Chedlent: 
Legs not so marked ... hi one aoe Ste BO 500 9. 
Tibiz striped with whitish (fig. 4, d) much as in Culex duttoni ; 
seventh vein more distinct than usual, and generally bearig a 
few scales (Heptaphlebomyia, Theo.) 50 site 9, univittatus. 
Legs uniformly brownish (except for pale knee-spots) — ... sn el; 
Abdominal segments with pale markings basally ... 300 eee ali 
5 33 * 3 apically ... Pe me gl 9: 
Abdominal segments with basal banding in both sexes... ame 
» 55 with basal lateral pale spots, in the ¢ often united 
in the middle line to form an irregular-shaped band _... Sach alae 
Larger species, abdominal bands yellowish .. LO. pipiens group. 
Smaller species, abdominal bands white... sda ae Hie welt 
Thoracic scaling uniformly reddish-brown ... ste wae Wiedecens. 
a 5» partly bronzy-brown and partly brassy, the latter 
often predominating sat “aa aa. oe ..» 12. stmpsone 
Thorax all pale-scaled, integument with lateral pale areas in front 
(fig. 5, 6); abdominal spots large in both sexes ... ey lla. pruma. 
Thorax not all pale-scaled, integument uniformly dark ... saeenlds 
Thorax with two distinct pale areas near the middle (fig. 5, ¢) 
14. ornatothoracis. 
5 With uniform scaling or nearly so ... oor oe coo MGs 
Venter entirely whitish oe aise ae E56 w» «15. guiarti. 
»» with dark bands on the apices of the segments ... ee lie 
Bases of fork-cells in Q equidistant from wing-base .» 16. grahami. 
Base of first fork-cell nearer wing-base than that of second ... 18. 
Larger species (usually 5-6 mm.); thorax with reddish brown scales 
17. zombaensis. 
Smaller species (usually 3-4 mm.); thorax with dark brown scales 
18. invidiosus. 
Abdomen with complete apical bands on at least some of the 
segments ace occ as sas Sat 556 506 sisie 20. 
Abdomen with apical lateral spots ... so os ye SS Ze 
