324 F. W. EDWARDS. 



and dark-scaled dorsum of the abdomen of the female, should make it quite 

 unmistakeable. So far as European specimens are-concerned there is Uttle variation, 

 though it should be noted that the thorax of the male is always much darker than 

 that of the female, usually quite black. 



The larva does not differ in any very striking manner from those of the sub- 

 genera Ochlerotatus and Ecculex ; the main points have already been noted. The 

 early stages are spent usually in flooded meadows and large marshes, but the species 

 is also found in woods. It is commonly associated with A. vexans. 



Distribution. — Throughout Europe, and extending across Siberia to North America, 

 where it has a wide distribution. The following are some new records :— Italy 

 (Sondrio, Bezzi) ; Finland (various localities and collectors) ; Siberia (Yeniseisk, 

 58° 20', and Turuchansk, 65° 55', Trybom ; Omsk, Grand). 



Subgenus Stegomyia, Theo. 



Adult. Proboscis moderately slender, but stouter than in Ochlerotatus, scarcely 

 as long as the rather short front "femora. Palpi short in the female, normally longer 

 than the proboscis in the male, the last two joints slender, upturned, with very few 

 hairs. Vertex with broad flat scales, few or no narrow ones on the nape. Thorax 

 usually with conspicuous and well-defined ornamentation. Lower mesepimeral 

 bristles absent. Male hypopygium usually without claspettes, unless these are 

 represented bv hairy basal lobes ; no apical lobes ; clasper with distinct terminal 

 spine. Aedoeagus divided into two more or less brush-like halves. Eighth segment 

 of female abdomen rather large, but distinctly retractile, the sternite not very 

 prominent in repose ; cerci rather short. Front and middle claws of the female 

 either toothed or not. 



Larva. Antennae short, with single hair and without spicules on shaft. Frontal 

 hairs single. Abdomen with or without numerous stellate tufts on dorsal surface ; 

 the eighth segment with a definite comb of teeth set in a single row. Siphon not much 

 more than twice as long as broad ; hair-tuft well developed and situated about the 

 middle. 



The larvae of many African species live in tree-holes, leaf-axils, etc., and these 

 species show a much greater development of the abdominal hair-tufts than is seen 

 in the Palaearctic species. 



Adtdts. 



1 . Mesonotum with a median silvery- white line . . . . • . • • 2 

 Mesonotum without such line . . . . . . • • • • • • ^ 



2. Female claws simple (Japan) albopidus (Skuse). 



Female claws toothed (Crete) cretinus, sp. n. 



3. Mesonotum with a lyre-shaped silvery-white mark ; tibiae dark except at 



tip . . . . . . . . . . • • • • argenteus (Poiret) . 



Mesonotum with four distinct white dots ; tibiae ringed with white a little 

 beyond the middle vittatus (Bigot) . 



Male Hypopygia. 



1 . Clasper modified, swollen and hairy apically, the spine long and curved and 



placed far before the tip .. .. ' vittatus {^igoi). 



Clasper normal ; spine shorter, straight, and terminal . . . . • • 2 



2. Clasper shorter, narrowed at the tip, side-piece with a large, densely bristly 



area . . . . . . . . . . . . • • • • argenteus (Poiret). 



Clasper longer, slightly swollen at the tip, side-piece with a large, hairy 

 basal lobe albopidus {Skuse). 



