MOSQUITOS OF THE PALAEARCTIC REGION. 297 



7. Outer side of hind femora with numerous scattered dark scales ; white 



rings of middle joints of hind tarsi less than half as long as the joints ; 

 thorax dark with some obscure paler markings . . . . maculatus, Mg. 



Outer side of hind femora pale except towards the tip ; white rings of 

 middle joints of hind tarsi at least half as long as the joints . . . . 8 



8. Costa at most with scattered pale scales ; abdomen largely dark . . . . 9 

 Costa pale-scaled on anterior edge, at least on basal half ; abdominal 



scales mainly or all yellow . . . . . . . . . . • • ..11 



9. Abdomen dark, tergites with well-defined basal white bands narrowed in 



the middle . . . . . . . • • • • • semicantans, Martini. 



Abdomen with ill-defined yellowish bands and scattered yellowish scales. . 10 



10. Mesonotum with a distinct broad median band of dark scales, sides 



yellowish ; pale bands of abdomen mainly basal . . . . annulipes, Mg. 



Mesonotum with obscure markings ; pale bands of abdomen largely at apices 

 of tergites . . . . . . . . . • • • • • excrucians, Wlk. 



11. Costa yellow-scaled only on the basal half freyi, sp. n. 



Costa mainly yellow-scaled in its entire length lutescens, F. 



12. Pro-epimeral scales all flat and straight, the upper ones black . . 



rusticus, Rossi. 

 Pro-epimeral scales all ochreous, the upper ones narrow and curved . . 13 



13. Postnotum with a tuft of scales lepidonotus, Edw. 



Postnotum without scales . . . . . . . . • • • • . . 14 



14. Wing-membrane whitish ; costal scales ah pale . . . . albescens, sp. n. 

 Wing-membrane not whitish ; costal scales mostly or all dark . . . . 15 



15. Front and middle femora conspicuously mottled in front with dark and 



light scales . . . . . . . . . • . . • • • • . . 16 



Front and middle femora with only a few pale scales in front . . . . 19 



16. Head and thorax with very dense bristles ; integument deep black. . alpinus. L. 

 Head and thorax only moderately bristly ; integument of legs paler . . 17 



17. The dark parts of the abdominal tergites with scattered pale scales ; male 



palpi usually all dark detritus, Hal. 



The dark parts of the abdominal tergites without scattered pale scales ; 

 male palpi with a whitish ring or numerous pale scales on the long basal 

 joint 18 



18. Proboscis all dark cataphylla, Dy&v. 



Proboscis with numerous pale scales in the middle . . . . salinellus, Edw. 



19. Hind femora pale, with a sharply defined black-scaled area at the tip 



diantaeus, H. D. & K. 

 Dark area at tip of hind femora much less sharply defined 20 



20. Hind tibia (at least in the female) with a distinct whitish stripe on the 



outer side running nearly the whole length ; mesonotum with white 



scales at the sides, blackish in the middle sticticns, Mg. 



Hind tibia without whitish stripe on outer side in either sex . . . . 21 



21. Scales of head and mesonotum ochreous brown, the mesonotum usually 



with one broad dark brown median stripe ; sometimes with two 



ill-defined stripes, or none punctor, Kirby. 



Scales of head and mesonotum darker brown, often mixed with white at 

 the sides ; the mesonotum usually without distinct stripes, or with 

 two ill-defined ones . . . . . . . . . . • • • • . . 22 



22. Flat scales of the head approaching the middle fine . . . . parvtdus, Edw 

 Flat scales confined to the sides of the head communis, De G. ; 



intrudens, Dyar ; pullatus, Coq- 



