344 PTEROPHORUS ISODACTYLUS. 



the spiracles ; the head is black, and so also is a narrow 

 plate across the middle of the back of the second 

 segment, which is divided in the centre by a thin line 

 of the pale ground colour; the anterior legs are black; 

 the tubercular dots above are small and black ; those 

 along the spiracular region are rather larger, and 

 those on the front part of the thirteenth segment are 

 very much larger still; a black plate is on the anal 

 flap ; it is noteworthy that each tubercular dot in this 

 Pterophorns has but a single hair. 



The pupa is smooth, nearly three-eighths of an inch 

 in length, the wing- and leg-cases meeting in a point 

 low down the abdomen, and in close contact with it; 

 in colour it is pale whitish -ochreous, the abdomen a 

 little deeper tinted ; it is generally striped and marked 

 with brown, particularly on the head and the back of 

 the thorax; the dorsal marking is a series of brown 

 acute triangles. (William Buckler, October, 1871 ; 

 E.M.M., December, 1871, VIII, 154.) 



In the autumn of 1870, 1 picked up a few specimens 

 of Pterophorus isodactylus in a marsh by the river side 

 (in Norfolk), and therefore looked over the place early 

 this summer for plants of some species of Senecio. 

 The grass, however, was lank and growing rapidly, 

 and Senecio hard to find, and it was not until the 

 21st of June that, extending my researches into an 

 unexplored corner, I found an ugly, scrubby-looking 

 species — S. aquaticus — growing in some plenty. 



My search for the larva was, however, cut quickly 

 short by the appearance of a specimen of the moth 

 already out, and then and afterwards I secured a good 

 many, the females being so exceedingly sluggish that 

 I only took two specimens of that sex. 



I had, therefore, to wait for the second brood to 

 make the acquaintance of the larva; but, according 

 to the contrary nature of things in general, just as the 

 moths must have laid their eggs, the marsh was 

 mowed, and although the farmer had distinctly 

 promised to leave a patch of the plants for me, the 



