278 Mr. L. B. Prout on new Geometridaa 



point of distinction between g. gracilis and its more southerly 

 races is the absence of black costal dusting on the proximal 

 part of the fore wing in the latter ; in g. gracilis the costa is 

 black or blackish to the base. Except at the base and on 

 the hind wing g. landbecki is individually very variable ; the 

 pale fulvous shade may disappear before one-third of the 

 costa, and not reappear, or it may reappear as an isolated 

 spot in the region of the distant areole, or with a large spot 

 at base of veins R^-M 1 , or it may run broadly to beyond 

 middle of costa, becoming confluent with the last-named spots 

 (name-type), and there may even be a further extension of 

 the outer spots into an irregular band proximal to the black 

 border and reaching SM 2 . 



Upper Kasai District, Congo Free State (P. Landbech) ; 

 7 c? c? in coll. Joicey. 



It may be pointed out that landbecki, Druce (Ann. &Mag. 

 Nat. Hist. (8) vi. p. 400), wrongly described as an Aletis, 

 and cited there by me in Lep. Cat. viii. p. 79, is a Mimaletis 

 (subfamily Geometrina), so that there is no fear of collision 

 in the use of this subspecific name. 



S u b f a m . Ubmitheinm. 

 2. Thalassodes clarijimbria, sp. n. 



$ .—42-49 mm. 



Face reddish brown. Palpus somewhat more reddish, 

 beneath yellow-white ; third joint relatively short, about half 

 as long as second. Vertex and antennal shaft white; occiput 

 green ; thorax and abdomen green above, unmarked ; beneath 

 white to whitish. 



Fore wing green, rather duller and bluer than in semi- 

 hyalina, Walk., the white strigulation rather strong ; costal 

 edge yellow at extremity, then whitish ; lines white, rather 

 faint, obsolete costally ; antemedian placed as in the allies; 

 postmedian rather far from termen anteriorly, reaching 

 hind margin at two-thirds; fringe almost white. 



Hind wing with termen more feebly bent at R 3 than in the 

 allies, excepting perhaps semihyalina ', concolorous with fore 

 wing, tie elongate cell-mark and the postmedian line both 

 present, but rather indistinct. 



Underside paler green, almost unmarked ; fore wing with 

 costal edge pale yellow ; both wings with fringe whitish. 



Ceylon: Maskeliya, Aug. 1905 (type) and June (G. C. 

 Alston), in coll. Joicey ; Hakgale, April 1907 {E.E. Green), 

 in coll. Brit. Mus. ; the latter yellower green, perhaps faded. 



Distinguishable from the allies by the whiter fringes and 



