25 



subfamily, together with a number of other genera of the present Agro- 

 tinae, Acronyctinae and Erastrianae. Until that time, we believe it 

 best to follow Sir George F. Hampson's keys and structural classi- 

 fication as closely as possible; for they represent the only workable 

 classification extant. From time to time changes will have to be 

 made in this classification due to the misinterpretation by Hampson 

 of an occasional character where he lacked proper material, and where 

 fresh specimens of a species would, in consequence, run out of his 

 keys ; or where the present International Rules of Zoological Nomen- 

 clature compell a change in the nomenclature but, in reality, not in 

 the true context. 



Judging from the genitalic standpoint, the present genus (Grotella- 

 forma) might well be an offshoot from Grotella or from a common 

 ancestor. The uncus has a spoon-shaped tip which bears a some- 

 what dorsal spine near the end ; the vinculum is pointed, tapering 

 gradually; and on the penis is a dense mass of heavy spines; all of 

 these characters being typical of Grotella ; and what seems of far more 

 importance to us is the fact that the same peculiar structure support- 

 ing the aedoeagus, described under Grotella septempunctata, is present. 

 There is, however, a very well developed sacculus, and a ventral corona 

 of spines not present in any of the species of Grotella which we have 

 examined. 



We append, herewith, a short description of Grotellaforma col- 

 ora, which may serve to identify this species, should other congeneric 

 species be found. 



Grotellaforma colora, Barnes. (Fig. 17) 



1907, Barnes, Can. Ent., XXXIX, 68, 93, Grotella. 1917, B. & McD., Cont. 

 Nat. Hist. Lep. N. A., I, #4, 11, pi. IV, f. 7 ("Type" $ ), Grotella. 



Primaries pure white, with black spots, some or all of which may be 

 vestigial. The black spots may be present as follows : t. a. region, one on 

 costa, one below cell ; medial region, one on costa ; t. p. region, one on costa, 

 one near end of cell, one just below vein 2 (Cu^), and one on inner margin. 

 Secondaries; usually fuscous, occasionally rather pale, but never white, with 

 the fringe pure white or very nearly so. Beneath ; wings smoky-fuscous, the 

 secondaries paler in anal regions and toward the bases. A common medial 

 darker line usually present, crossing the primaries and secondaries. Fringes 

 white. 



Expanse: 14-19 mm. 



