142 ME. F. "W. EDWAEDS ON OLIGOCENE [vol. lxxix, 



preservation ; there are several specimens on one slab of paper-coal, 

 obviously pupse of a Cliaoboms (Corethra) . The characteristic 

 hexagonal structure of the thoracic respiratory organs is clearly 

 visible under a magnification of 75, and the size and general 

 appearance is closely similar to that of the existing European 

 species. 



Culex ceyx Heyden. 1 Rott, Siebengebirge. The figure shows a 

 female mosquito with short palpi and somewhat pointed abdomen, 

 but the wing- venation is not indicated. It is possibly an Aedes. 

 I am indebted to my friend Mr. P. H. Grimshaw for the loan of a 

 specimen, said to be this species, from the Royal Scottish Museum, 

 collected at Rott, the type-locality. The specimen is of little 

 value, however, as it shows only portions of the thorax and 

 abdomen ; there is nothing to prove that it is a mosquito at all. 



(c) Upper Oligocene of Aix-en-Provence. 



Culicites depereti Meunier. 2 Although Meunier simply defines 

 ' Culicites'' as 'with the appearance of Culex or Corethra,'' his 

 photograph shows what is obviously a typical Culicine mosquito. 

 The wing-venation is not well shown, but some vein-scales are 

 preserved. The specimen is a female, with palpi nearly a third as 

 long as the proboscis. The tip of the abdomen appears to be 

 damaged. 



Jfiriopterites tertiaria Meunier. 3 Although Meunier states 

 that his specimen is ' incontestablement ' an JErioptera, he never- 

 theless proposes the new generic name JSriopterites for it. 

 Inspection of his photograph makes it perfectly obvious that it is 

 not a Tipulid at all, but a species of Dixa (possibly identical with 

 D. minuta Meunier), with a venation similar to that of the recent 

 D. obscura Loew and D. clavulus Will. 



The occurrence of Corethra in these deposits has been mentioned 

 by Hope. 4 



(d) Middle Oligocene of the Isle of Wight (Gurnet Bay). 



Dixa priscula Cockerell. 5 This differs slightly from most 

 recent species in having the cross-vein m-cu unusually oblique and 

 placed somewhat before r-m. 



Aedes peotolepis (Cockerell). (PI. VII, figs. 2-4 & text- 

 figs. 1-2.) 



5 . Culex protolepis Cockerell, Proc. U.S. Nat. Mus. vol. xlix (1916) p. 488 



& pi. lxii, fig. 1. 

 J. Culex petrifactellus Cockerell, Ibid. p. 489 & pi. lxi, fig - . 12. 



1 Palseontographica, vol. xvii (1870) pp. 252, 266 & pi. xiv, fig. 21. 



2 Verhandl. Akad. Amsterdam, sect. 2, vol. xviii (1916) No. 5, p. 16, photo. 



3 Ibid. p. 15. 



4 Trans. Entom. Soc. London, vol. iv (1847) p. 252. 



5 Ann. & Mag. Nat. Hist. ser. 9, vol. vii (1921) p. 466. 



