SPECIES or C0LEX AND ALLIED GENERA. 257 



5. Middle tibiae with a whitish lateral stripe (fig. 4, b) ; abdominal 

 bands broadest in middle ; band of proboscis broad and ill-defined 



4. duttom. 

 Middle tibiae unstriped ; abdominal bands of equal breadth 

 throughout ; band of proboscis narrower and more clearly 

 defined ... ... ... ... ... ... ... ... 6. 



%. Femora not marbled ... ... ... ... ... ... 5. thalassms. 



I „ marbled {i.e., with dark and light scales interspersed) 



6. somaliensis, 



7. Large species (usually 7 mm. or more in length) ; legs spotted 



7. tigripes. 

 Medium-sized or small species ; legs not spotted .., ... ... 8. 



8. Legs striped somewhat as in Ochleretatus ochraceus (on the fore 



legs the pale stripe is more or less broken up into spots, recalling 

 Culex tigrijies) (fig. 4, c) ... ... ... ... ... 8. theileri. 



Legs not so marked ... ... ... ... ... ... ... 9, 



9. Tibia3 striped with whitish (fig. 4, d) much as in Culex duttoni ; 



seventh vein more distinct than usual, and generally bearing a 



ie^w scsles {Hej)taphlebomyia,lL\\eQ.) ... ... 9. univittatus. 



Legs uniformly brownish (except for pale knee-spots) ... ... 10, 



10. Abdominal segments with pale markings basally ... ... ... 11. 



,, „ „ „ apically ... ... ... 19. 



11. Abdominal segments with basal banding in both sexes ... ... 12. 



„ „ with basal lateral pale spots, in the cj' often united 



in the middle line to form an irregular-shaped band ... ... 14. 



12. Larger species, aMominal bands yellowish ... 10. pijnens group. 



Smaller species, abdominal bands white ... ... ... ... 13. 



13. Thoracic scaling uniformly reddish-brown ... ... ... 11. deceiu, 



„ ,, partly bronzy-brown and partly brassy, the latter 



often predominating ... ... ... ... ... 12. simpsoni 



14. Thorax all pale-scaled, integument with lateral pale areas in front 



(fig. 5, h) ; abdominal spots large in both sexes ... ... 13. pruina. 



Thorax not all pale-scaled, integument uniformly dark ... ... 15. 



15. Thorax with two distinct pale areas near the middle (fig. 5, c) 



14. ornatothoracis, 

 „ with uniform scaling or nearly so ... ... ... ... 16, 



16. Venter entirely whitish ... ... ... ... ... 15. guiarti, 



„ with dark bands on the apices of the segments ... ... 17. 



17. Bases of fork-cells in Q equidistant from wing-base ... 16, graliami. 

 Base of first fork-cell nearer wing-base than that of second ... 18. 



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, 



19. Abdomen with complete apical bands on at least some of the 



segments ... ... ... ... ... ... ... ... 20. 



Abdomen with apical lateral spots ... ... ... .„ ... 22. 



