MOSQUITOS OF THE PALAEARCTIC REGION. 



269 



Larva- — Shaft of antenna with a branched hair (except in A . plumbeus). Palmate 

 hairs lanceolate, without long terminal lilament. Internal clypeal hairs generally 

 close together. 



The members of this subgenus exhibit considerable diversity, and some obviously 

 fall together into groups, but when the species of the whole world are considered it 

 does not seem profitable or even possible to recognise distinct subgenera. The nine 

 Palaearctic species at present known may be distinguished f)y the following tables :— 



Adults. 



1 . Wing-scales all dark ; front femora cylindrical ; female pedpi slender, 



the scales appressed [Anopheles) .. .. .. .. .. •• 2 



Wings with many pale scales ; front femora thickened at the base ; 

 female palpi and proboscis (except in .4. lindesayi) shaggily scaled 

 towards the base [Myzorhynchus) . . . . . . . . . . . . 6 



2. Wing-scales uniform ; base of upper fork-cell considerably nearer wing- 



base than that of the lower . . . . . . . . • • • • 3 



Wings normally with spots of darker, more densely aggregated scales ; 

 fork-cells somewhat shorter, their bases practically level . . . . 5 



3. WTiite frontal tuft absent ; mesonotum unicolorous, with dark hair 



algeriensis, Theo. 

 White frontal tuft present ; mesonotum darkened at sides, with some 

 pale hair and scales . . . . . . . . • • • • • • • • 4 



4. Smaller, blacker species ; a distinct patch of white scales on front of meso- 



notum . . . . . . . • . ■ • • • • plumbeus, Hal. 



Larger, browner species ; scales on front margin of mesonotum narrower 

 and not pure white bifurcatus, L. 



5. Mesonotum unicolorous ; wing-fringe all dark . . . . elutus, sp. n. 

 Mesonotum darker at sides ; fringe usually pale at tip of wing 



inaculipennis, Mg. 



6. Costa with only one pale spot (at the tip) ; hind femora with a conspicuous 



white pre-apical ring ; front femora only slightly enlarged at the base 



lindesayi, Giles 

 Costa with two distinct pale spots (normally) ; hind femora without pre- 

 apical white ring ; enlargement at base of front femora conspicuous . . 7 



7. A white dot at base of costa, and a second near it . . . . pundibasis, sp. n. 

 These dots absent . . . . . . . . • • ■ • • • • • . ^ 



8. Fourth and fifth hind tarsal joints all white mauritianns, Grp. 



Fifth hind tarsal joint dark . . . . . . . . . . • • ... 9 



9. Fourth hind tarsal joint dark except at the tip .. .. .. • ; ^^ 



Fourth hind tarsal joint all white or whitish, hyrcamis var. pseiidopictus, Grassi 



10. Wing-markings usually more sharply defined ; basal half of costa with 



dark scales only ' .. . . ' hyycanus, Pall. 



Wing-markings more blurred ; basal half of costa with some pale 

 scales on its inner edge . . . . hyrcanus var. mesopotamiae. Chr. 



Male Hypopygium. 



1 . Base of side-piece with only one strong spine .. .. algeriensis, Theo. 

 Base of side-piece with more than one strong spine . . . . . . • • 2 



2. Base of side-piece with three spines, two of them branched bijitrcatus, L. 

 Base of side-piece with two spines, both simple . . . . . . . . 3 



3. Spines of claspette approximated, but not fused . . . . . . • • ^ 



Spines of claspette fused into a spatulate process . . . . . • • . ^ 



(4183) " 



