THE CAJNAJjlAiN ElSTUAlULoGiST. 10 1 



contour and size at once strikes the eye. Riley's cut represents an 

 insect 20 lines in expanse of wings. I venture to say that no Fall Web- 

 worm Moth ever attained such a size. But latitude was necessary to 

 take in such moths as congrua and acnea. Then as regards the series of 

 wings given on page 246. These we may conclude, from the whole 

 tenor of the article, include representations of ciniea, punctata, puncta- 

 tissima, etc. They are on the scale of 18 lines for expanse of wings. 

 There is not one of them but can be exactly matched from insects I raised, 

 or that ivere taken with the mother insect in the Gomin. 



Let us now consider the larvce : 



A comparison of the Rev. Dr. Hulst's account of the larvae of S. 

 congrua {Ent. Amer., II., 162), and of Professor Saunders's description of 

 the larva of S. cunea, in its last stage, with the following life-history, 

 written with care by myself, will, I think, show that the three descriptions 

 relate to one and the same species. 



Life-history of Spilosoma congrtia, Walker : 



Eggs. — Waxen, globular, laid dispersedly and unattached on the 

 loth of July, very small for the size of the insect — one-thirtieth of an 

 inch in diameter. Hatched July i6th. 



Newly-hatched larva. — One-tenth of an inch long, of a pale greenish 

 tint, with a row of reddish-brown tubercles along the middle of each 

 segment above. Every tubercle has two or three rather long, black 

 hairs. Head dark brown. The larva feeds with avidity upon Chenopo- 

 dium album, also upon Taraxacum and Plantago. It shows no dis- 

 position to spin. Moulted July 23rd. 



Larva after first moult. — -Length, three-tenths of an inch. Body 

 reddish-brown, with black warts, from which proceed spreading tufts of 

 long, black hairs with short spinous branches. Head bilobed, black. 

 Feet black. Moulted July 29th. 



Larva after second moult. — Length, half an inch. Body dark brown 

 with dark brown warts thickly set with tufts of black hair. A side line of 

 red warts with a black tuft above and another below each wart. Larva 

 exceedingly active — scuffles about in true Arctian fashion. Moulted 

 August 8th. 



Larva after third moult. — Length, one inch and one-tenth. Head 

 shining black, bilobed. Body black, warty, densely clothed with jet 

 black hairs. A side line of red warts as before, but hardly seen under 

 the pile that overlaps it. 



