404 ENTOMOLOGICAL NEWS [Dec., '(X) 



The marginal areas may be considered next. Scales from 

 four typical regions were studied. The basal anal region, seen 

 in B, is marked by its general covering of symmetrical white 

 scales crowded upon the surface. Schneider describes as 

 characteristic of this region in several families, three peculiar 

 types of scales, one of which closely approaches the unsym- 

 metrical form occurring in another portion of the wing ; but 

 these types were not found in Anosia. Along the immediate 

 margin, appear long plumose hairlike scales. B. 10-12. Along 

 the outer margin, as represented in C, the characteristic fringe 

 scales predominate. These scales closely overlap, appearing to 

 be in several layers. The general surface scales grade into 

 these long and sharply notched ones. There is wide variation 

 in the size and shape of the type, as seen in (C. 17- K)). In 

 size, they range from 0.2 mm. to 0.5 mm. ; in shape, from 

 rounded scales to characteristic triangular ones with several 

 sharp apices (C. 19). At region D, the central costal area, 

 these fringe scales are somewhat shorter (D. 22, Plate II). 

 The common surface type and the hairlike pulmose ones also 

 occur. 



The scales of region E, the basal costal area, are among the 

 most peculiar of the whole wing surface. It is here that the 

 unsymmetrical scales are found (E. 32). These scales have a 

 single sharp apex, the lobe at one side of the sinus much larger 

 than the one on the opposite side, and are marked with oblique 

 striations. It was a type approaching this form that Schneider 

 found not only here, but also along the inner margin of the 

 wing. These peculiar scales occur also on the lower surface of 

 the basal anal region of the forewing (E. 33). In studying 

 their general arrangement, it was noted that their tips stand 

 away from the wing membrane and are also directed away from 

 the margin of the wing. The two regions where these scales 

 occur, overlap. Owing to their projecting tips and oblique ar- 

 rangement, they might well serve as a "locking device" for the 

 two wings, thus holding them so closely together that they act 

 as one membrane. Occurring also, where Schneider found 

 them, in the region adjacent to the insect's body, they might 



