( 529 ) 



either side. Antennae of cf very sliortly ciliate. Tlie fovea is represented Ijy a 

 thiclcening of the wing membrane, covered by a tuft of scales beneath, as strong in 

 the ? as in the cJ. In appearance the insect bears most resemblance to G. iuchoata 

 Wlk. and G. subalbitaria Swinh., both Indian species. 



90. Osteodes exumbrata Wlk. 



This species, described by Walker in Vol. XXVI. p. 168(1, lias been sunk to 

 tiuence's procidata, but appears really to be a good and distinct species. Among 

 the insects sent from the Escarpment, British East Africa, liy Doherty, are thirtv-six 

 examples of both sexes, showing no variation whatever. They are entirely devoid 

 of any yellow or red coloration beneath, such as occurs in both of Guenee's .sjjecies 

 procidata and liirbidenkita ; on the upper side there is no trace of discal spot in 

 either wing ; below both wings are suffused and thickly sprinkled with brownish 

 grey, with a pale unspeckled postmedian band, followed by a blackish shade, darker 

 in forewings, which pales off to the hindmargin ; the cell-spots here are distinct ; 

 but there is no trace whatever of a pale, whitish or yellow, longitudinal streak 

 through the cell to hindmargin, which is a prominent feature of Guenee's two 

 species. It is possible that Guenee had this species mixed up with the others, as 

 he speaks of the imderside varying greatly, and adds that, mainly in the ? ¥ , the 

 longitudinal streak is in some eases obsolete. In exumhrcda the pale apical streak 

 is very prominent both above and lielow. 



91. Petrodava albosignata \\\k. 



The comparison of a good series (11 tjc?, 3 ¥ ? ) of this sjiecies from the 

 Escarpment, British East Africa, proves it to be at once very variable and handsome. 

 There appear to be two forms : one olive-green below, sometimes mixed with 

 yellowish, the other much suft'used below with chestnut-lwown, the basal space 

 always remaining slightly greenish tinged. On the upperside there is not so much 

 difference, though the brown suffusion makes the upper surface of those insects in 

 which it occurs much darker, in some cases purplish brown with a violet tinge, 

 obliterating most of the markings; in all cases between the median shade and outer 

 line there is a fascia paler than the rest of the wing, varying in inteiisity and colour 

 according to the extent of suffusion ; the outer line is always followed by an in-egular 

 dark shade, forming a consjjieuous costal blotch, and the fringe from apex to vein 5, 

 except at the extreme ajiex, is always white in the green forms, pale reddish in 

 the browner specimens ; but the forms run into each other ; the white spotting of 

 the palpi and legs noticed by ^^'alker is generally observable. 



92. Petrodava latimargo sp. nov. 



Forewinrjs : dull ochreous-yellow, covered with red-brown and fuscous striae, 

 whicii form by coalescence three dark bands ; the first narrow and curved, at 

 one-fourth ; the second, wider and more diffuse, median ; the thud is limited 

 inwardly by a more distinct dark line at two-thirds, parallel to hindmargin, but 

 with a tooth basewards on vein 4 ; beyond the third band the margin again is paler ; 

 fringe dark brown ; ceU-spot obscure. 



Hindiviwjs : with two bands only ; the outer with a dark subapical spot. 



Underside bright yellow with regular fuscous striae ; the bands reddish chestnut ; 

 basal band wanting ; second, beyond the plain black cell-spot, entire, pale red ; the 



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