NO. 2119. BRITISH FOSSIL I^fSECTS—COCKERELL. 489 



males, as they are to-day. The thorax is fully 2 mm. long (that of C. 

 protoleins is scarcely 1.40 mm. long). The proboscis, formed as in 

 the modern species, is about 1,920 fx long; the dorsal aspect of the 

 thorax before the scutellum (i. e., the prescutum and scutum) is 

 1,470 fi long; the very prominent scutellum is 400 fj, high. The 

 depth of the abdomen is 720 ju, and the first two long segments are 

 each about 960 ^ long. 



OHgocene at Gurnet Bay (Brodie). Lacoe Coll., no number. 



Eolotype.— Cat. No. 61430, U.S.N.M. 



Another Culex from Gurnet Bay (No. 7549) shows a wing about 4 

 mm. long, with reddish scales on the costa as in C. protolepis, but the 

 rest of the mng denuded. The venation is obscure, but the marginal 

 ceU is at least 640 fi long, probably more, and the base of the sub- 

 marginal cell seems to be about 640 fj. basad of base of marginal. It 

 may be a distinct species, but it is probably C. protolepis. It appears 

 to be too small for C. protorhinus. The width of the wing about 

 middle is 880 /x (Cat. No. 61431, U.S.N.M.). 



CULEX PETRIFACTELLUS, new species. 



Plate 61, fig. 12. 



Wing as preserved about 2.5 mm. long, but the base is lacking; 

 when complete it would probably be 2.8 mm. The venation is not 

 very clear, but enough can be seen to place the insect in Culex (s. 

 latiss.), where it is remarkable for the narrow wings and very small 

 size. The following measurements are in ix: Width (depth) of wing, 

 640; base of fourth posterior cell basad of level of second marginal, 

 1,120; length of second marginal, 560; length of fourth posterior to 

 end of upper side, 1,010; to end of lower side, 640. The only striking 

 feature discernible in the venation is the great distance between the 

 bases of the second marginal and fourth posterior cells, a distance 

 greater than the width of the wings; a condition Uke that found in 

 AnopTieles punctipennis. 



Oligocene at Gurnet Bay (Brodie). Lacoe Coll. 7620. On a small 

 piece of rock, about 44 mm. long, with Philoponites, etc. 



Eolotype.— Cut. No. 61432, U.S.N.M, 



PALTOSTOMOPSIS, ne^w genus (Blepharoceridae). 



Small flies with venation resembling in general that of Paltostoma, 

 but differing as follov/s : Basal cell not visible in the specimen, which 

 shows the wing to a short distance beyond the base, it must there- 

 fore be reduced in the manner of Hammatorhina; cubitus single, and 

 no anal vein. The costa is neither thickened nor bristly; the lower 

 margin- has fine equal bristles with black bases; in Bihiocephala 

 grandis I find exactly the same bristles with black bases, except that 

 they are much closer together and imequal in size. I can detect 



