92 



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

 able red brown larva with very long antennae, 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/y 

 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/vi to Vvn 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/ tx 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 5/v the first halfgrown O. diantceus larvae appeared in the 

 samples; by 25/y 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/jx is remarkable. 



Geographical distribution: The species has hitherto only been found in 

 America. New Hampshire (H. D. K. 1917 p. 758). 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, labellae conically 

 tapered; vestiture black, labellae 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 



