MOSQUITOS OF THE PALAEARCTIC REGION. 



295 



11. 



12. 



13 



Antennae almost devoid of spinules ; pecten-teeth very long mariae, Serg. 

 Antennal spinules well-developed ; pecten-teeth shorter . . zammittii, Theo. 

 Five or six small hair-tufts in anal brush before the barred area . . . . 13 



At most three such tufts ; siphonal index 3 or less . . . . . . 17 



teiTuinal teeth of pecten more or 



Siphonal index distinctly over 3 



less detached . . . . . . . . . . . , . . . . . . 14 



Siphonal index at most 3 ; all pecten-teeth close-set . . . . . . 16 



14. Comb of eighth segment with 6-9 teeth in one irregular row 



semicantans, Mart. 

 Comb with 23-35 teeth in a triangular patch . . . . . . . . 15 



15. Siphonal index about 3-2 ; anal gills half as long as the saddle luiescens. F. 

 Siphonal index quite 3-5 ; anal gills as long as the saddle , 



16. Siphonal index 2 -3-2 -7 



Siphonal index 2 • 6-3 



One or two simple detached pecten-teeth beyond the 



17 



No pecten-teeth beyond the tuft 



18. Anal gills much shorter than the saddle 

 Anal gills at least as long as the saddle 



19. Hair-tuft distinctly beyond middle of siphon ; anal gills 



two- thirds as long as saddle 

 Hair-tuft practically at middle of siphon 



20. Siphonal index 2 ; anal gills globular . . 

 Siphonal index 2-6-3 



21. Anal gills globular, not a quarter as long as the saddle 

 Anal gills half as long as the saddle . . 



22. Comb with 50 or more scales in the patch 

 Comb with 10-20 pointed scales in the patch 

 Comb-scales sharp-pointed ; anal gills twice as long 



as 



excrucians, Walk. 



annulipes, Mg- 



maculatus, Mg- 



siphonal tuft 



cataphylla, Dyar. 



. . 18 



..19 



. . 22 



one- third to 



caspius, Pall. 



. . 20 



detritus, Hal- 



..21 



dorsalis, Mg- 



salinelhis, Edw. 



. . 23 



. . 24 



the saddle 



pidlatus, Coq. 

 Comb-scales blunt-ended, fringed ; anal gills about as long as the saddle 



communis, De G. 



Last few pecten-teeth detached .... . . . . . . . . 25 



All pecten-teeth close-set . . . . . . . . . . . . . . 26 



xAnal segment with a complete chitinous ring, only half as long as the 



gills ; frontal hairs single . . . . . . . . . . alpinus, L. 



Anal segment with saddle only, as long as the gills ; frontal hairs 



branched . . . . . . . . . . . . . . intrudens, Dyar. 



Anal segment with a complete chitinous ring, about as long as the gills 



pimctoy, Kirby. 

 Anal segment with an incomplete ring, only half as long as the gills 



sticticus, Mg. 



Subgenus Ochlerotatus, Arrib. 



Adults. Proboscis slender, distinctly longer than the front femora. Palpi short 

 in the female ; longer than the proboscis in the male (very rarely of equal length 

 or slightly shorter), the last two joints and the tip of the long joint swollen and 

 hairy, the last two joints turned very slightly downwards, the terminal joint generally 

 a little more slender than the penultimate. Hair-whorls of male antennae rather 

 irregular, the majority of the hairs projecting either dorsally or ventrally. Vertex 

 with narrow scales only, the flat ones being confined to the sides of the head. Lower 

 mesepimeral hairs usually (not always) present. Male hypopygium with long. 



23 



24. 



25. 



26. 



