1898.] 155 



As noted in connection -with an English locality, ante, 2nd ser., vol. v, 261 

 (1894), specimens of this species in good condition are distinguishable in the net 

 from other PsychodcB, without a lens, by an appreciable difference in their appear- 

 ance, due to the wing-markings. In deportment they approach Ps. humeralis. 

 Worn and faded examples of either sex are liable to be mistaken for Ps. alhipennis ; 

 but, unless too much denuded, the difference in the distribution of the bristling 

 hair of the wings can be made out, and usually some scant vestiges of the dark spots 

 remain. The dark spots on the axillar and postical nervures, being formed of 

 bristling hairs before their terminations, enable aged specimens to be distinguished 

 readily from Ps. sexpunctata in ill-condition, which has dark spots of hair inclined 

 outioards at the end of these nervures. 



Apparently rare in England, about four examples only having 

 been captured in Somerset and Dorset, in localities recorded ante, I. c, 

 and vol. iv, p. 25 (1894). Local in Algeria, frequenting cool, shady 

 places by streamlets in wooded valleys at the foot of hills and mount- 

 ains in the Mediterranean Zone of botanists. 



Sectiois" II OF PsYCHODA ; British species, No. 6. 



liefer ante, 2nd ser., vol. iv, p. 33, step 7a, and vol. v, pi. iv, Ps. 6 

 (details). 



Affinities in general w^ith the preceding Section, especially with 

 regard to the distribution of the bristling hair in the posterior half 

 of the wing, approaching in particular the species scheduled b ft, in 

 the proportions of the inferior (^ genital appendages, and the spcies 

 scheduled hb in the contour of the verticils of hair of the antennse. 

 More distantly related to Pericoma* Section lY, B, having the same 

 distribution of bristling hair in the anterior half of the wing as P. 

 revisenda, scheduled b.b.b., 5?? (wherein both differ from the 1st 

 Section of Ps2/cJioda), and having such hair on corresponding nervures 

 in the posterior half of the wing (only to a greater extent), besides 

 resembling it somewhat in the relative shortness of the inferior ^ 

 genital appendages. 



Antennae in both sexes 14 — 16-jointed, as described, supra, in step B. of the 

 tabulation of Major Sub-Divisions of Psychoda. Verticils of hair of the flagellum 

 dense and smooth j the first 10 oval-cupuliform, or cask-shaped ; the 11th in combi- 

 nation with the terminal jointlets, a complete oval. Articular appendages linear, 

 tsenoid, membranaceous, transparent, perhaps built up of concatenate cells, and 

 difficult to distinguish without previous removal of some of the hair ; the 12th joint 

 ■with two pairs of them, opposite and convergent near the tips, but with the extreme 

 points everted. 



More extended observation is needed to ascertain whether all of 

 the insects of this Section here reckoned as varieties of one species 



* Cf. ante, 2nd ser., vol. vli, p. 115 (May, 1897). 



