92 



the larva of A. cinereus I found, among the numerous 0. cantans larvae, a remark- 

 able red brown larva with very long antenna?, almost as long as those of C. morsi- 

 tans but almost straight, not elegantly curved as in this species. — I immediately 

 saw that I had to do with a new species for our country. In the time from 25/v 

 to 5/vi the pond was visited almost every day; the larva was rare, and I never got 

 more than about fifty specimens; they were hatched in my cages before 5/vi. By 

 5/vi the pond was almost dried up and got only very little water till October; 

 practically it was dry. In the time from 20/ V i to i/vn and later on in August I 

 have often tried to catch the imago among the vegetation which covered the dry 

 bottom. It was always in vain. I had quite given up finding the imago in Nature, 

 when suddenly on 29/ IX 1919 I found it in another part of Grib forest. Dredging 

 in the northern part of Griblake my assistent and I were suddenly attacked by 

 mosquitoes. The boat was about thirty meters from land; it was fine sunshine and 

 almost calm where the boat was. I had an opportunity to catch some of them; 

 they undoubtedly all belonged to the same easily recognizable species. 



In the winter 1919 — 20 up to June 1920 the pond was visited regularly; it 

 was open from February and contained enormous quantities of 0. communis till 

 about 20th May. On -Vv the first halfgrown 0. diantceus larvae appeared in the 

 samples; by 25/v all were pupae; the larvae were much rarer in 1920 than in 1919; 

 I found only about thirty, which were hatched; among them were only two males. 



For the present -we must register this species among the forest mosquitoes, 

 hatched in spring in ponds which are commonly laid dry in June; they winter as 

 eggs and probably do not possess more than one generation. The late occurrence 

 on 29/ix is remarkable. 



Geographical distribution: The species has hitherto only been found in 

 America. New Hampshire (H. D. K. 1917 p. 7;">8). Only the male has hitherto been 

 known. The species has been determined by Dr. Edwards. The description of the 

 female is new; that of the male has been worked out in accordance with that of 

 Howard, Dyar and Knab; the description of the remarkable male genitalia has 

 been quoted verbatim. 



15. O. sticticus (Meig.) var. concinnus Steph. 



Description. Female: Proboscis rather long, uniform, Iabellae conically 

 tapered; vestiture black, Iabellae grey; setae small, black. Palpi short, not one fifth 

 as long as proboscis, black, no brighter scales at tip. Antennae long, the joints sub- 

 equal, rugose, pilose, black, second joint a little larger; hairs of whorls rather short, 

 sparse; tori subspherical with a cup-shaped apical excavation, black with a few 

 greyish-white scales on the inner side. Clypeus rounded, triangular blackish nude. 

 Occiput black, clothed with coarse narrow, curved yellowish-white scales, margin 

 of eyes and the cheeks white, scales on lower part of sides flat; many slender, erect 

 forked black scales; setae along margin of eyes rather short, black. 



Prothoracic lobes elliptical, remote dorsally with narrow yellowish scales and 



