254 GEORGE D. HIILST. 



R. occidentalis n. sp. — Expands 32-34 mm. 



I give this name to an insect of which I have received many 

 specimens from Victoria, Brit. Col. It is very uniform in appear- 

 ance, and without doubt nearly related to R. bruceata. It is, how- 

 ever, in the % uniformly darker on all wings, and the fore wings 

 have the apex more rounded and the inner margin shorter. The 

 inner angle is thus broader and the wing more oval in shape. The 

 9 is blackish gray instead of fuscous. 



R. latipennis n. sp. — Expands 28 mm. 



I give this name to a species received from California, of which I 

 have no females. The wings are much broader than in R. bruceata 

 or latipennis, and the apex much less extended. It has much the 

 same markings as bruceata, but they are more decided in color the 

 lines of the hind wings being especially pronounced. In general 

 appearance it approaches Opheroptem bruniata of Europe. 



R. hyperborean n. sp. — Expands 23 mm. Very much in appearance like 

 E. luHpennia. with narrower wings, the two outer lines quite distinct, the central 

 band obsolete, and the vestiture more hairy, and uniformly of very much smaller 

 size. 



I suspect this may be a subarctic form of R. bruceata. My speci- 

 mens of R. hyperborea are all from Alaska, and are very uniform in 

 size and appearance, and are all smaller than any specimen of R. 

 bruceata I have ever seen. 



HYDRIOMIN^. 



The Hydriominje are, with the Dyspteridina^, in the main very 

 easily and clearly distinguished by the peculiar anastomosing of 

 vein 8 of the hind wings with the cell. The exceptions, where the 

 vein is separate, but joined by a cross-bar beyond the middle of the 

 cell are peculiar, but can in no wise be made another subfamily as 

 the females are normal. As noticed by Mr. Meyrick the most of the 

 species with this peculiar structure have the inner margin in the S 

 with a fold or pocket, and the anterior part seems to be broadened 

 and the anterior veins separated as a compensation. 



A second exception which, as has been seen, I have made a sub- 

 family is in the case of a few genera where the frenulum is wanting. 

 This I have called the Dyspteridime, from Dyspteris, the ty])ical 

 genus. 



Another exception which I have j)laced with the Geometrinie is a 

 genus of the "greens" which ditlers from this subfamily and agrees 



