44 



SCIENCE- G OSSIP. 



extension to the in. marg. and the presence of a 

 more distinct marginal row of light spots on h.w. 



c. ab. hyaleoides. Gr.-Gr. Mem. Eom. IV. 

 p. 321. Smaller than type ; marginal border f.w. in 

 both sexes marked with narrow light spots. Hab. 

 Central Asia. 



We come now to the second group of the genus. 

 composed of those species wdiich are spotted on 

 the marginal border in both sexes. They are 

 mostly allied to our European C. liyale and C. 

 phicomone, but one or two are rather difficult to 

 place. After some consideration I have determined 

 to arrange them as follows : — 



26. C. ehristophi Gr.-Gr. Mem. Rom. ii., 

 1885. 



42 — 47 mm. 



F.w. Ground colour brownish fulvous shaded 

 with greenish towards in. marg. Marginal border 

 broad, with a well defined row of large whitish 

 spots. Disc, spots black and well defined. H.w. 

 dull olive green, with a border much resembling 

 that of f.w., but less defined on its inner edge, with 



C. ehristophi. 



large whitish spots. Disc, spot white, round and 

 not large. 2 resembles S, but the marginal 

 borders are somewhat broader and the spots larger. 

 Marginal fringes in both sexes whitish, but 

 antennae red as in the other species. U.s. greenish 

 grey with a submarginal border of faintly marked 

 light spots. Disc, spots as above. 



Hab. N. Fergana (Namangan), Samarkand. 



This is an altogether remarkable species as 

 regards pattern and colour. An ordinary observer 

 looking at a collection of Coliades invariably 

 singles out this species as worthy of notice. 

 Staudinger at one time took it for an ab. $ of 

 C. wiskotti (Berl. e. Z. xxvi. p. 167). 



27. C. hyale, L. S. N. ed. x. p. 469. Lg. B. E. 

 p. 53, pi. xii. fig. 3. " The pale clouded yellow." 



37—43 mm. 



<£ wings sulphur yellow. F.w. with a round 

 black disc, spot ; out. marg. band enclosing a row 

 of conspicuous yellow spots and ending rather 

 abruptly so as not to reach the in. marg. (conf. 

 C. erate) ; as it approaches the latter it gradually 

 becomes narrower. H.w. yellow, blackish at base ; 

 there are faint traces of a black band at the anterior 

 part of out. marg. Disc, spot large and orange- 



coloured. J resembles $ in pattern, but the black 

 markings are darker and the ground colour is 

 nearly white, u.s. f.w. yellow, darker at apices ; a 

 sub-marginal row of five or six black spots. H.w. 

 deeper yellow ; disc, spot large, silvery, surrounded 

 by a red ring with a smaller spot placed above it, 

 at the base a dull red mark. A submarginal row 

 of dull red crescents and a narrow red spot on costa. 

 Head, thorax, antennae, and legs dull red, marginal 

 fringes pink. 



Hab. The entire Palaearctic Region, except the 

 Canary Islands and the Polar Region. IV. — X. 

 In England generally scarce, but sometimes very 

 abundant. VII. m. 



Larva green, with yellow dorsal and lateral 

 stripes. The dorsal stripe spotted with black on 

 each segment. Feeds on Coronilla, Trifolium, 

 Vieia, etc. Pupa green, with a brownish yellow 

 lateral stripe. 



a. J ab. fiava Husz. Eperjes Ker. coll. 1880-1. 

 A dimorphic form of 2 having the yellow colour 

 of $ . Found with type, but not common. 



b. ab. nigrofasciata Gr.-Gr. Mem. Rom. i. p. 163. 

 With a black discoidal streak. Hab. Sarepta. 



c. v. alta Stgr. Stett. E. Z. 1886, p. 200. Larger 

 and with a broader marginal band. Hab. Fer- 

 gana. 



d. v. poliograplnts Motsch. Et. ix. (1860) p. 29. 

 Simoda de l'Orza. Lep. Jap. p. 16. Larger, 

 yellower, with a more intensely black marginal 

 band. Hab. Amur, Corea. VII. 



e. v. sareptmsis Stgr. Cat. 1871, p. 5. F.w. with 

 a broader marginal border, $ yellower. Hab. 

 Sarepta, Persia, Central Asia. 



{To be continued.} 



BRITISH FRESHWATER MITES. 



By C. F. George, M.R.C.S. 



WITH A NEW SPECIES. 



GENUS THY AS. 



"FN 1835-41 C. L. Koch figured and described a 

 -*- mite which he named Thyas venusta. In his 

 " Uebersicht," dated 1837, he places this in his 

 second division, which he calls " Sumpfmilben," 

 and in his second class of these mites, his first 

 class being " Limnochares " Latr. He stated that 

 these mites are found in water and mud, and are 

 without swimming hairs. Over thirty years after, 

 in 1873, Neuman described a mite under the name 

 of Bradybatcs truncatus. whose great feature was 

 that it possessed no swimming hairs. In 1892 

 Piersig described a mite, using the same name ; 

 but in 1897 he satisfied himself that it was none 

 other than Koch's Thyas venusta. In his great 

 work on German water-mites Piersig gives an 

 analytical table of the family, naming five species, 

 four of which have been found in the British Isles. 



