igii.] E. Brunetti : New Oriental Nemocera. 291 



PSYCHODA and PERICOMA. 



A closer study of the Indian species in these two genera 

 (which represent the only Oriental ones available) results in several 

 characters being found which were not made use of in my pre- 

 vious paper on this family. 



Firstly there is the presence or absence of distinct scales on 

 the wings^nearly always of some shade of brown, although 

 sometimes appearing whitish or greyish when viewed from certain 

 directions. These scales appear in only one species {apicalis) of 

 Psychoda, but characterise several species in Pericoma, whilst 

 in Parahrimettia they are present in some species on both the 

 upper and lower surfaces of the wing, and in others on the lower 

 surface only. 



In referring to these scales, allusion is not made to a certain 

 number of scale-like hairs or even true scales, few in number and 

 irregularly placed, at the base of the wing, and which may be 

 present in many species, possibly adventitiously ; but only to 

 cases where the scales are numerous, eminenth' conspicuous and 

 arranged in regular rows, covering thickl}^ the whole of such 

 portion of the wing-surface as they ma^^ occupy. 



The second character, which, like that of scales, is quite con- 

 sistent in its occurrence or absence, is that of hairs, comparatively 

 soft or at least less bristly than usual, closely covering the sur- 

 face of the wing as well as the veins and arranged longiindinally 

 or nearly so, so that they do not form the " criss-cross " pattern 

 obvious in the case of all those species in which the hairs are 

 confined to the veins. It is quite obvious at a glance to which 

 category au}^ wing belongs except in the densely scaled ones. 



The third consistent character is the position at which the 

 2nd longitudinal vein forks {alwa^^s near the base of the wing) : 

 whether before or after (proximad or distad of) the origin of the 

 3rd longitudinal vein. 



Further characters appear less definite and should best be 

 applied only to the separation of closely-allied species, being 

 liable to occasional variation. 



The three principal characters above specified can be used in 

 both Psychoda and Pericoma} Under Brunettia and Parabrunettia 

 (two at present rather indefinitely characterised genera) are given 

 some considerations relating, chiefly or wholly, to those species at 

 present referred to them. 



PSYCHODA, Latr. 



Table of species. 



A Surface of wing either without scales, or 

 (when such are present) limited to ;i 



1 Probably they will be toiiiid to apply equally well to at least Parabrunettia 

 also, when this genus is more closely characterised and a larger number of its 

 species better understood. 



