158 The Scottish Naturalist. 



rUKTHEE NOTES OifT THE SPECIES OP OPOEABIA. 



By F. BUCHANAN WHITE, M.D., F.L.S. 



SINCE the notes at p. iii were printed, I have seen a copy of 

 M. Guenee's " Phalenites/' and consequently can give a 

 translation of some of his remarks on the species of Oporabia 

 (vol. ii. p. 262-266). 



1353. O. dilutata^ 40 mm. Front wings light grey, with a slightly 

 yellowish tint, the lines grey, sinuous, bluntly toothed, arranged in 

 bands and always pretty well marked ; the subterminal double 

 with larger teeth ; the two central sometimes each composed of 

 three lines. The small central spot is contiguous to the second 

 line, and the black apical dash is more or less visible. Hind wings 

 paler, with 2 parallel subterminal lines marked in black at the 

 costa ; on the underside there is a third line, also more distinct on 

 the costa, and a black central spot. The $ is smaller, with more 

 distinct lines, and the 2 central bands clouded with blackish. This 

 species varies excessively. The ^ s vary from pale greyish sulphur 

 with well-marked lines to smoky grey without markings. 



M. Guen^e then alludes to the various forms which have been 

 considered as species. The only one of these to which we need 

 refer is neglectata Stph. (Brit. Mus. Cat. p. 198), which like many 

 other Scottish insects is larger than more southern individuals. 

 Weaver thought that the antennas were thicker, but M. Guenee 

 could not detect this in the specimens he has seen. 



1334. O. atitunuiata Bdv. Does not vary in size so much as 

 dilutata. The four wings are concolorous, silky, dirty white, never 

 greenish ; all the lines are partly obliterated, and show well on the 

 costa only. But the black points and dashes of the nervures are 

 persistent, those on the bifurcation of the 2nd and 3rd nervures 

 drawing attention at the first glance. In very well marked 

 examples it can be seen that the second line is straighter, much 

 less toothed, and that it forms upon the i' almost a right angle that 

 is not to be seen in dilictata. The hind wings and the underside 

 are also only slightly marked. The 9 resembles the ^ in all 

 respects, and is of the same size, whilst in dilutata the $ is smaller 

 and more strongly marked. 



1335- O.filigrammaria H. S. Allied to dilutata, and much more 

 so to atitu7n?iaria, but is always smaller. Front wings straigliter 

 and more produced at the tip. Ground colour always slatey-grey 

 (gris-violdtre), with bands darker and more filled up with black ; 



