Geometrida3 in the Joicey Collection. 115 



11. Racheospiln penthica, sp. d. 

 (PI. VII. fig. 2.) 



S . — 36 mm. 



Face blackish. Palpus rather short, blackish, the first and 

 second joints white beneath. Crown dirty green, with a 

 large black spot on each side. Antenna blackish ; pectina- 

 tions scarcely longer than diameter of shaft. Occiput and 

 front of thorax green ; thorax and abdomen above otherwise 

 black, beneath dirty white. Fore and (to a less degree) 

 middle leg blackened, with white spots at ends of joints ; 

 hind leg white, the tibial process reaching just beyond 

 middle of first tarsal joint. 



Fore loing with 80^ free, W just separate, M* widely sepa- 

 rate ; black, with an interrupted green mark, oblique out- 

 ward, near base, slight green marks around the large but 

 otherwise scarcely visible black cell-mark ; a small, green, 

 black-dotted patch at nearly three-fourths. Costa and a very 

 nari'ow green distal border, widening slightly at apex and 

 containing at its proximal margin a row of rather large inter- 

 neural black spots; a similar terminal row, extending on to 

 the fringe. 



Hind wing with termen slightly subcrenulate, somewhat 

 bent at R^ j black, with a small green subbasal mark, and a 

 narrow green distal border, which throws a small projection 

 inward in front of R^ ; terminal spots as on fore wing. 



Fore wing beneath nearly as above, but rather more 

 brownish black and with a narrow blue-white hind-marginal 

 area, which broadens near base so as to touch M. Hind 

 wins beneath blue-white, with a blackish shade between R^ 

 and costal margin, deepest towards apex, fading out indefi- 

 ])itely proximally. 



Huancabamba, Cerro de Pasco, E. Peru, 6800 feet. 



Belongs to the exertata group {^Blechroma, Moschl.), and 

 suggests being an aberration of some species of more normal 

 colour-proportions. From the rich district of Huancabamba 

 I know hitherto only three species of the group — nigricinctay 

 Warr., conspersa, Warr., and tisstigmaria scotocephala, Prout 

 (Nov. Zool. xxiii. p. 163), — all in single specimens. I have 

 compared it with particular care with all the three, but also 

 with the rest of the group, and cannot make the wing-shape 

 and the position of such markings as remain agree with any. 

 The palpus and tibial process appear slightly shorter than in 

 nigricincta, the costa more arched in middle, the submarginal 

 dark spots nearer the termen,' etc. ; the shape of the liind 

 wing differs from that of tisstigmaria. 



8* 



