New Geometridae and Dioptidae in Joicey Collection 267 



this area arises at hindmargin before one-third, is very oblique and 

 slightly sinuous to anterior extremity of cell, where it touches (without 

 absorbing) the dark celldot ; the anterior boundary runs from this 

 point to the base of SC 5 ; the distal from this point to hind margin 

 at about three-fourths, bluntly angulated outwards in middle and 

 slightly excurved at hind margin ; terminal line complete, strongly 

 thickened midway between the veins. Hind wing with the white 

 median area considerably broader and reaching costal margin, the dark 

 basal area small, the distal area narrower than on fore wing, with 

 corresponding angle and curve in middle and at hind margin ; this area 

 somewhat more mottled, with a suggestion of round dark interneural 

 spots and of pale lunules edging proximally the terminal lines. 



Underside similar, but with no metallic scaling ; a small additional 

 white patch at base of fore wing. 



French Gaboon. 



By the scaling and general conditions (palpus, venation, &c.) this 

 seems referable provisionally to Pycnostega, in spite of absence of fovea ; 

 the antennal pectinations, though strong and close, are less extreme 

 than in the type species (obscura Warr., Nov. Zool. xii, 394). 



23. Pycnostega (?) stilbia sp. nov. 

 ? , 30 mm. 



Antenna bipectinate with very short branches. Palpus blackish. 

 Face, vertex and upperside of body blackish, sprinkled with metallic 

 light-blue scales. Underside of body browner, with less metallic scaling. 



Fore wing considerably broader than in typical Pycnostega (more 

 Zamarada-sh&iped) ; ground colour nearly as in the preceding species, 

 but clouded nearly throughout with blackish, thus appearing considerably 

 darker ; the metallic blue scales rather more copious ; median band 

 narrow, tapering at costa, otherwise nearly uniform in width (circ. 

 2*5 mm.), slightly outbent in middle, very pale yellow with copious 

 metallic whitish scales and traversed in middle by a thick, sinuous 

 golden line ; distal area with crenulate pale (metallic-scaled) lines, the 

 two outer nearly meeting between the veins ; terminal line as in the 

 preceding species. Hind wing similar, the median band continued, 

 not tapering costally, its golden line less strongly sinuous, distal area 

 with three pale lines, the two proximal meeting on the veins, the third 

 distal between the veins. 



Underside without metallic scaling, the median band yellower, the 



