MOSQUITOS OF THE PALAEARCTIC REGION. 317 



to the dense tuft of hairs near the tip of the side-piece, projecting caudally from 

 about the level of the apical lobe, though not actually from the lobe. The long 

 hairs arching over the upper surface are not nearly so numerous as in A. pullatus. 

 A. diantaeiis also has a conspicuous hair-tuft, but in that species the tuft is situated 

 about the middle of the side-piece and projects inwards. The claspette-stem in 

 A. intnidens is angulated, with a projection arising from the angle, and a bristle 

 on the projection. 



Distribution. — Widely spread in Canada. I have seen only one European male, 

 in the Berlin Museum, labelled 16.V.44, H. Locw. Dr. Enderlein informs me that 

 Loew was most probably in the Posen district on this date. 



Subgenus Finlaya, Theo. 



Adult. Proboscis slender, longer than the front femora. Palpi short in the 

 female ; from one-half to nine-tenths as long as the proboscis in the male, the last 

 two joints usually slightly thickened, moderately hairy and turned downwards. 

 Head scales and ornamentation of thorax variable. Lower mesepimeral bristles 

 absent. Male hypopygium with well developed claspettes, which bear a long and 

 rather slender appendage ; no apical or basal lobes to side-pieces ; clasper and 

 aedoeagus as in Ochlerotatus. Eighth segment of female only partly retractile, 

 the sternite large and prominent in repose ; cerci rather short. Front and middle 

 claws of female toothed, the hind pair simple. 



Larva. As in Stegomyia, with some exceptions. 



Most if not all the members of this subgenus breed in tree-holes and similar 

 situations or in rock pools. The species are most numerous in the Oriental region, 

 but they are found in practically all parts of the world, except the polar regions. 

 Owing no doubt to their restricted breechng-habits, there is a strong tendency in this 

 subgenus to the production of local species, and comparatively few have a wide 

 distribution. 



Adults. 



1. Tarsi (at least hind pair) with whitish rings . . 2 



Tarsi all dark . . . . . . . . • • • • • • • • . ' * ^ 



2. Tarsal rings extending on to apices of joints ; thorax not distinctly lined 



togoi (Theo.). 

 Tarsal rings at bases of joints only ; thorax conspicuously lined . . . . 3 



3. First three joints of hind tarsi ringed at base, last two all dark 



japonicus (Theo.). 

 All joints of hind tarsi ringed at base koreicus, Edw. 



4. Head scales almost all broad and flat ; a large (sometimes divided) 



silvery- white area on the front of the mesonotum . . niveiis (Ludlow). 



Head scales narrow except at the sides ; mesonotum otherwise . . . . 5 



5. Mesonotum with narrow lines of yellowish scales, sides not broadly 



whitish eatoni (Edw.). 



Sides of mesonotum broadly whitish scaled . . . . . . . . • • 6 



6. Scales of scutellum mostly or all narrow and ochreous . .gcnicnlatus (Oliv.). 

 Scales of scutellum all broad, flat and white . . . . echinus, Edw. 



Male Hypopygia. 



1. Stem of claspette extremely short, knob-like togoi (Theo.). 



Stem of claspette about as long as the appendage . . 2 



2. Side-piece with a tuft of large scales on the upper side . . niveus (Ludlow). 

 Side-piece with small scales on the outer side only . . . . . . . . 3 



3. Side-piece with very long and rather dense hair, as long as the side-piece 



itself , on the upper flap d?a/07» (Edw.). 



Hair on side-piece shorter, only about half as long as the side-piece . . 4 

 (4183) z 



