2 10 [September, 



The character of the indumentum of the under-side of the wing 

 in the (^ has much in common with that of P. incerta (29), of the 4tli 

 Section of this genus. 



Subsection D of the 3rd Section of Pericoma. 



Refer supra, p. 129. 



Affinities with Subsections A and C on the one hand, and with 

 Psychoda on the other. The distribution of the bristling hair in the 

 posterior half of the wing of Psychoda can be matched in certain 

 species of the Subsections A and D ; while in the other species of 

 this Subsection it has the same distribution as in the species numbered 

 19 and 21 of Subsection C. The British species, P. decipiens (20) 

 and adoena (24), with No. IX of the Algerian, are of the latter 

 category ; No. X of the Algerian is of the former. In the anterior 

 half of the wing P. decipiens, with the same sp. No. IX, resembles 

 in the distribution of the bristling hair the species scheduled C, e, 

 among which an approximation of the ending of this hair on the 

 anterior radius to the bifurcation is noticeable in P. consors (22) ; P. 

 advena, in the pattern of this character, resembles the species scheduled 

 C, c.c. ; the species No. X has no bristling hair on the subcosta, but 

 otherwise conforms to the pattern of Psychoda, Section I (excluding 

 Ps. erminea). 



20. Pericoma decipiens, Etn. 

 P. decipiens, ante, 2nd ser., vol. iv, 126, step 5, and vol. v, pi. iii, 

 P. 20 (detail). 



Wing rich dark brown, without, spots; almost facsimile of P. amhigua (19), 

 and, as stated above [under P. soleata (21)], indistinguishable in the net therefrom ; 

 but on close inspection easily separated by the synoptical characters. In addition, 

 the nearness to the radial bifurcation of the ending of the bristling hair on the 

 anterior radius is a feature worth noting, marking an approach towards the elimina- 

 tion of this hair from the branch, actually effected in the allied Algerian species 

 No. IX ; its distance from the axil of the fork is equal to the width of the fork. 

 The distribution of scales on the under-side of the wing-nervures in the $ is very 

 nearly the same as in P. soleata. Season, June and July. 



This is probably the P. canescens (Mg.) of Mr. Verrall's list of 

 British Biptera (1888), three specimens, out of the five that were thus 

 labelled in his collection, being of the present species. Of these three, 

 one $ and one ? were from Fritton (28, vi, 1881), and a doubtful 

 fragment, from Denmark Hill, London (1, vi, 1868) ; the remaining 

 two specimens were a $ of indeterminable species from Eannoch 

 (22, vi, 1870), and a P. soleata, $ ?. 



