198 



name belong to semiobscurella; the two species are very much alike 

 but apparently the stalking of vein 10 of primaries with 8 and 9 is 

 constant in pravella and is a good means of separation in doubtful 

 cases; the stalking of veins 4 and 5 on primaries does not always 

 hold. We think Packard is correct in describing the larva of pravella 

 as feeding on willow as his material came from Brunswick, Me. and 

 Maine is the type locality for pravella. Riley's citation of sumach 

 as the food plant (Rag. Mon. Phy., p. 315) is due to a misidentifka- 

 tion ; he probably had bred semiobscurella, the larva of which is a 

 sumach feeder, occurring in two generations; we have a bred series 

 before us from larvae collected around Decatur. Pravella is appar- 

 ently a more northern species, our only specimens (all 9 's) having 

 been received from Hymers, Ont. 



M. DELASSALIS Hist. 



The original 5 type came from Nevada according to the de- 

 scription ; later, in the revision, Hulst added specimens from Colo... 

 N. Mex., and Ariz, and one of these later specimens from N. Mexico 

 labelled 'type' is responsible for our usual conception of the species; 

 unfortunately the 9 from Nevada which is also present and labelled 

 'type' in the Hulst Coll. proves to be a worn specimen of what Hulst 

 later described as purpurella; in the true delassalis the t. a. line is 

 quite distinct in the lower portion being white and angled, heavily 

 bordered with black ; the t. p. line is very close to the outer margin ; in 

 the other species, which probably will now bear the name fcrnaldi 

 Rag., the t. a. line is practically obscured by a heavy black band and 

 the t. p. line is further from outer margin ; the veins in the outer 

 portion of the wing are slightly striate with black and the ground 

 color is orange-ochreous not reddish-ocher. 



Megasis cinctella Hist. 



The type 9 in the National Museum is worn and has only a 

 single palpus this being covered with mould and so distorted that 

 examination is very difficult. According to the venation we should 

 be inclined to place the species in Passadena Hist. ; it agrees in having 

 vein 2 of secondaries close to angle of cell and 3 stalked with 4 and 

 5 which are on a very long stalk ; on primaries 4 and 5 are short 

 stalked, 10 appearing to be short stalked with 8 and 9, in this respect 

 differing from the type of Passadena. The species certainly has no 



