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JOURNAL OF VARIATION. 



No. 1. Vol. III. January 1.5th, 1892. 



THE GENUS ACRONYCTA AND ITS ALLIES. 



By Dr. T. A. CHAPMAN. 



{Continued from page 251.) 



iiOTES ON Plate VI. — These figures show the larvse 

 of Acronycta, Section Cnspidia, with the exception 

 of Ciispidia stn'gosa (on PI. IX.) and C. aceris (on 

 PI. v.), that of Monia orion being also included. 

 The young larvae of Cuspidia have a more delicate appear- 

 ance than those of Viniinia, due to the tubercles having, 

 not several, but one hair on each tubercle (the anterior 

 trapezoidals of aceris and leporina have two). They all 

 strongly present the Acronycta feature of a "weak" nth 

 segment, this being always pale, always with smaller 

 tubercles and finer, shorter hairs, lower dorsally, though often 

 a little wider, and with the tendency to a sub-division into an 

 anterior and posterior sub-segment more marked than in an\- 

 other segment. The " pale " and " dark " segments are in C. 

 psi, tridens and strigosa the same as in Viminia, viz., 3,4. 6,7. 

 10,11 pale ; in psi, 13 is dark ; in tridens and strigosa, pale. In 

 strigosa, the dark portion of the dark segments is more decidedly 

 a mere dorsal lozenge, but this is to some extent the case in the 

 other two, not so much so in the remaining species. 



In atni, 6 and 7 have become dark segments and 10 partially 

 so ; inegacephala is nearly the same, except that 10 is dark, and 

 3 and 4 are somewhat doubtful. In aceris and leporina, 10 

 remains pale, as also does 6 ; 3 is pale in leporina, dark in 

 aceris. 



With regard to M. orion, it will be sufficient here to note 

 that, very different as it is from the others, the " weakness " of 



