320 



F. W. EDWARDS. 



and others who identified C. ornatus as this species were therefore probably right. 

 Meigen's C. lateralis may also be the same, as supposed by Theobald, but the 

 type being lost it is impossible now to say whether it was this species or A. sticticiis. 

 Mr. J. E. Collin has kindly examined for me the two males of C. fusculus in Zetter- 

 stedt's collection at Lund, and from his notes and accompanying sketch of the claspette 

 there can be no doubt that C. fusculus is A. geniculatus. Zetterstedt must also 

 have included with these males rubbed females of other species, as one which was 

 sent me by Dr. Bengtsson in 1912 was an Ochlerotatus near 0. cataphylla. 



Fig. 10. First abdominal segment of larva of (a) Aedes geniculatus and (b) AMes echinus, showing 

 the remarkable difference in the development of the hairs. 



Distrihiition. — Throughout Europe from France to Galicia and from south Sweden 

 to Macedonia, wherever there are deciduous trees, such as beech, sycamore, plane, 

 horse-chestnut, sweet chestnut, etc., in sufficient numbers. It occurs also in Corsica 

 {Yerhnry, Segiiy) and in Asia Minor (Brussa, Mann). It is not yet known from 

 Siberia or North Africa, though its known range will no doubt be extended by future 

 observations. The most northerly record I have is Scania, Sweden (Boheman). 

 Its absence from the far north may be accounted for by the fact that coniferous 

 trees, also birches and willows, do not readily form rot-holes that will contain water. 

 Its apparent absence from Scotland and Ireland is not so easy to explain. The 

 North American representative {A. triseriatus, Say) is specifically distinct. 



32. Aedes (Finlaya) echinus (Edw.) (figs. 6 a, 10 b, 11). 



Ochlerotatus {Finlaya) echinus, Edwards, Bull. Ent. Res. x, p 133 (1920). 



The adult is very similar to A . geniculatus. apart from the two points mentioned 

 in the key, but the larva is strikingly different, chiefly on account of the remarkable 

 development of the hair-tufts on the thorax and abdomen. These appear to corre- 

 spond rather closely in number and position with those of A. geniculatus, but the 

 component hairs are more numerous, distinctly plumose, somewhat longer, and 

 much stouter, giving the insect a very urchin-like appearance (whence the specific 



