COLOTOIS. By L. B. Prout. 331 



G. bidentata CI. {= dentaria Hhn.) (16 f). Anteuiial pectiratiors in (^ ^hoit. Distal margirs stroigly biden/afa. 

 (that of forewing irregularly) crenulate. Diwcal marks ocellated. Median area' of forewing variable in width. 

 Colour variable, in the name-type grey-brown. — ab. nigra Prout (= surtur B.-Haas) is a Mendelian melanic nigra. 

 form which has recently become common in parts of Lancashire and Yorkshire. — ab. edentula Krulik. (= eden- edenhda. 

 tata Bbl.) lacks the smaller teeth in the distal margin of the forewing. — exsul Tchetr.erikov (= asiatica B.-Haas) exsul. 

 is smaller, greyer, the forewing narrower, more distinctly marked, less strongly dentate. 8ajan, Kentei Moun- 

 tains, etc.; Amurland. — ■ Larva somewhat thickened posteriorly, extremely variable, best recognized by its 

 shape and additional prologs; whitish-ochreous, ochreous, purple-brown or grey-brown, mottled and clouded, 

 or mixed with green like lichens, very responsive to its evironment. Polyphagous on trees in August and Sep- 

 tember. Pupa in a cocoon among the roots, hibernating. Moth in May — June. Central and N. Europe, S. 

 Russia, Central Asia, E. Siberia, ? Japan. 



G. graecaria B.-Haas, founded on a $ from Attica, has the shape of the 2 following, proximal and graecaria. 

 distal areas of forewing yellow-brown, dark dusted, median area much darker, twice as wide anteriorly as 

 posteriorly. 



G. muscularia Stgr. (16 f). Very similar to some weakly marked forms of bidentata, the ^ auteimal muscularia. 

 pectinations slightly longer, the smaller teeth in the distal margin less developed, lines of forewing less appro- 

 ximated at hindmargin, the postmedian not (as in bidentata) with slight curve basewards at costal extremity, 

 straighter, not dentate. Zerafshan, Ferghana, Issyk-kul, Hi, Korla, Koko-Nor. 



G. alienata Stgr. (25 g). (^ antennal pectinations agaui somewhat longer. Wings more straw-coloured «^^«"«'<*' 

 or yellow-brownish, the lines placed nearly as in muscularia but much more conspicuous. Kashgar, Ferghana, 

 Hi district and Koko-Nor. 



G. insulata Bastelb. (= variegata Wilem.) (25 g). In general rather smaller than bidentata, antennal insulaia. 

 pectinations sinrilar, apex of forewing not acute, distal margins not crenulate, only the forewing with a rather 

 deep, rounded excision between the 1st and 3rd radial. Extremely variable in colour, yellow-brown to purple- 

 brown, forewing generally with a pale apical patch. Best known from Formosa; also from Chungking 

 (W. China). 



G. arida Btlr. (16 f). Antennal pectinations about as in alienata, distal margin much less deeply «''^«'"- 

 crenulate. Ground-colour sUghtly more reddish, postmedian line differently shaped, more broadly pale-edged 

 distaUy, shading off into the ground-colour proximaUy. Japan and probably the Ussuri district. — bilinearia bilinearia. 

 Swinh. is often duller coloured (but very variable), postmedian line slightly more curved, finer, less diffuse 

 proximaUy, the pale line beyond it much more slender. N. W. Himalayas. 



G. aurata sp. nov. (16 f). Apparently hitherto confused with arida, although Butlek many years awrato- 

 ago gave it the Mst. name of aurata. Forewmg not toothed at 1st radial. Nearest to lentiginosaria Moore, from 

 India, smaller, less deeply coloured, postmedian Hne nearer distal margin; ^ antenna bipectinate. From the 

 similarly coloured alienata the wingshape and the postmedian Hne of both wings distinguish it. 'Japan: 

 Imaichi, etc. in August; 3 (^(^ in coU. Brit. Mus., 1 in coU. Sbitz. 



G. acutaria Leech (16 g). Shape about as in the preceding, the apex and the point at 3rd radial acute, actdaria. 

 Brighter golden yellow, discal ocellus minute, postmedian line well developed. Chang Yang. — contaminata contami- 

 form. nov. (= bivittaria Btlr. nee Moore). Paler, very coarsely and irregularly speckled, both wings with black 

 terminal dots generally developed. Differs from aurata in the minute cell-marks. Dharmsala and Jalauri Pass, 

 N. W. Himalayas, coU. Brit. Mus. 



G. similaria Moore differs from all the other Palearctio species in the simple ^ antenna (genus Cenocte- similaria. 

 nucha Warr.). Colour of bidentata, shape nearly as in muscularia, the excision between the radials of fore- 

 wing deep; hnes formed nearly as in the arida group, postmedian with white dots on the veins as in 

 bidentata. Kulu. Also in Sikkim. 



56. Genus: Colotois Hbn. 



Face rough-haired and with a tuft projecting from beneath antenna partly across the eye. Palpus 

 short. Antenna in (J very strongly bipectinate. Pectus and femora densely hairy. Forewing with 1st sub- 

 costal anastomosing or connected with costal and with 2nd subcostal. $ much narrower winged than (J. Larva 

 twig-like, with rudimentary prologs on the 5th abdominal segment (which disappear at the last moult) and 

 with a pair of small raised points on the dorsum of the 8th abdominal segment. Htibners genus Colotois was 

 very heterogeneous, but Meyrick has restricted it to pennaria, which is therefore the type. 



C. pennaria L. (= cerasi F.) (16 h). Very variable, but easy to recognize. The white, dark-margined pennaria. 

 subapical dot (sometimes entirely dark) is very rarely wanting. The <^ is usually of the warm golden brown 



