40 



on the contrary, vary much in their shape, and are connected together 

 by a broad neck. The pigment-cells at the upper focus, present the 

 appearance of a sort of irregular net-like covering to the upper mem- 

 brane of the scale ; this is lost sight of as we focus downwards, when 

 the beaded striae come into view. The distance of the longitudinal 

 striae of the scale, shown in Plate IX., is from a ten-thousand-five- 

 hundredth to a six-thousandth of an inch, and that of the cross 

 striae from a twenty-thousandth to a ten-thousandth of an inch. 



In conclusion I would remark that the crumpled structure of the 

 striae on the scales of the Lepidoptera has long been familiar to me ; 

 and since studying those of the Amathusia Horsfieldii, I have again 

 examined several, and found the characters now described common, 

 in degree, to a great number; they are, however, developed in a re- 

 markable manner in those of the insect now under consideration. 



EXPLANATION OF PLATE VIII. 



Fig. 1 . Scale from under side of upper wing of Amathusia Horsfieldii. 



Fig. 2. Portion of a scale magnified 1900 diameters. 



Figs. 3 and 4. Scales from under surface of upper wing. 



Figs. 5, 6 and 7. Hairs of A. Horsfieldii. 



Fig. 8. Amathusia Horsfieldii. Male. 



Figs. 9 and 10. Scales from under side of tip of upper wing. 



Figs. 11, 12, 14 and 15. Scales from upper side of tip of upper wing. 



Fig. 13. Scale from under side of tip of upper wing. 



EXPLANATION OF PLATE IX. 



Characteristic scale of A. Horsfieldii, magnified 825 diameters. 



