18UG.] 209 



limits; in this last case the remaining bristling hair exterior to the spots (if not 

 deciduous) matches in colour with the smoother hair of the wing; but between the 

 spots and the wing-roots, the bristling hair is glossed with whitish-grey from certain 

 standpoints. Indumentum of the under-side of the wing similar to that of P. 

 consors (22). 



From aHother standpoint, all the hair of the body and wings, excepting the 

 black spots, becomes dark brown of a warm tint. Season, May to July. 



Haliday's description was from specimeus in Dale's collection ; 

 therefore, from carded specimens likely to be slightly rubbed in the 

 process of mounting. This would account for the comparatively 

 little stress laid upon the spots. Mr. Verrall obtained a specimen at 

 Three Bridges, Sussex, with P. morula and other Psijchodidce, on a 

 park-paling (16, vi, 1892) ; and in his cabinet a ? from Saunders' 

 collection (under P. canescens) perhaps belongs here. 



In the net, P. soleata, ambigua (19), decipiens (20), and revisenda 

 (30), are all very much alike in size and colouring, appearing blackish, 

 with a whitish gloss on the costal fringe at the tip of the wing. In 

 the field, therefore, it is advisible not to mix together from different 

 stations specimens of this pattern of coloration. 



Psychoda mnrginalls, Banks, described in " The Canadian Ento- 

 mologist," xxvi, 333 (1S91), may possibly be related to this Subsection. 



19. Pericoma ambigua., Etn. 



P. amhigua, ante, 2nd ser., vol. iv, 126, step 4«, and vol. v, pi. ii, 

 P. 19. 



Wing with rich dark brown hair, with fringes to match ; the fringes with rather 

 a talcose gloss, which in some postures is general, but is limited from other stand- 

 points to the posterior fringe. A well-marked pencil of hair on the radio-cubital 

 trunk or front edge of the anterior basal cell. The ranks of bristling hair become 

 visible only under certain phases of illumination, and on the radius as far as the 

 bifurcation the hair seems ratlier longer tlian elsewhere ; by a suitable adjustment 

 of light, the bristling hairs can be made to appear blackish, but there are no black 

 spots by the forks or elsewhere. Beneath, in the S , at the base of the wing, all of 

 the nervures and both of the margins interior to the fringes are beset with stipate 

 elongate scales, which on most of the nervures are continued a short distance beyond 

 the fold of deflection, but on the subcosta to a little beyond the end of the media- 

 stinal nervure, and are succeeded by flattened hairs, followed gradually in their turn 

 by ordinary hairs ; the scales on the subcosta are distinguishable with a Coddington 

 lens from the upper-side, when held against the light. In the ? , scales are confined 

 to the principal nervures interior to the fold. The $ genitalia conform to the same 

 general pattern as those of the preceding species of this Subsection. Season, June 

 and Julv- 



