1883.] 177 



for, although congeneric with two Hawaiian species, which I (misled 

 by the appearance of their females) erroneously referred to Scotosia, 

 it, nevertheless, belongs to the group of genera confounded under the 

 name of Boarmia : under this designation there must be at least three 

 or four good and characteristic genera. 



In a collection received from Mr. Blackburn, in 1880, were males 

 of my "Scotosia " vara, which ought perhajDs to have opened my eyes 

 to the fact that this species and S. corticea had no business in that 

 genus, but I suppose that, having a name for the species, I failed to 

 examine it critically, and thus perpetuated my error. 



These three species, then, will fall into a new genus of Boarmiidcd 

 which I shall term : — 



ScoTOETTHKA, gen. nov. 



Wings entire ; primaries triangular, with straight costal and inner margins and 

 slightly convex outer margin ; first and second sub-costal branches emitted close 

 together near the end of the cell ; the third, fourth, and fifth branches emitted from 

 below the second at some distance beyond the cell, the third and fourth forming a 

 long fork to apex, the fifth being nearer the cell and, therefore, emitted sooner than 

 the two preceding branches ; radials normal, the upper radial being emitted from 

 the anterior angle of the cell, and the lower from the middle of the discocellulars 

 which are transverse and not angulated ; the second and third median branches 

 emitted almost from the same point at the posterior angle of the cell ; secondaries 

 sub-pyriform, decidedly narrower than in typical Boarmia, with slightly undulated 

 outer margin ; costal and sub-costal veins lying close together towards the base, so 

 that, to the naked eye, the former appears to be emitted from the latter ; the sub- 

 costal simple, passing away from the cell before its extremity, the discoidal area 

 being confined by the continuation of the radial into the sub-costal ; discocellular 

 slightly oblique, divided by a strongly defined longitudinal fold ; median branches 

 exactly as in the primaries : body rather slender, especially the abdomen of the male, 

 which extends considerably beyond the posterior wings ; palpi rather large, coarsely 

 scaled, projecting (as in Scotosia) for some distance in front of the head, the ter- 

 minal joint depressed ; forehead conical between but a little below the antennae; the 

 latter organs very long, especially in the male, plumose from about the basal fifth to 

 the external two-sevenths; thorax rounded, abdomen with well-defined anal tuft; 

 legs long and slender with the exception of the tibiae of the hind pair which are 

 broad and compressed ; tibiae of second pair terminating in two unequal well-marked 

 spurs. 



1. Scotorythra arboricolens, sp. n. 



(J . Allied to S. corticea : dark smoky-grey ; wings transversely striated with 

 creamy-whitish, but less strongly towards the outer margins, thus leaving a well- 

 defined external border ; two central slightly angulated blackish parallel stripes; 

 antennae white with greyish pectinations ; back of thorax and abdomen dark 

 sericeous grey ; posterior edges of abdominal segments white ; anal tuft testaceous : 



