156 PTEROSOTOMA PALPINA. 



one or other of which seems to be undeveloped in each 

 example; skin glossy, colour dark brown. (J. H., 31, 

 12, 86.) 



PTILOPHORA PLUM1GERA. 



Plate XXXIV, fig. 2 (see ante, p. 73). 



To Mr. Buckler's description of this larva I wish to 

 add some notes, made by Dr. Chapman's help, of a 

 curious appendage, which was discovered by Mrs. 

 Fletcher while inflating an empty larva- skin. The 

 position of this appendage is between the head and the 

 first pair of thoracic legs, and the first sight of it 

 suggested an extra pair of legs ; in form it is a 

 transverse projection, somewhat sausage-shaped, free 

 at the ends, which bifurcate into two narrower pro- 

 cesses, the posterior of which is longer and thinner 

 than the anterior ; the tips of these processes are 

 rounded, and they are studded, especially at the tips, 

 with fine hairs ; these ends project laterally beyond the 

 body of the larva, and ventrally beyond the legs. Mr. 

 Fletcher tells me that when a larva of jplumigera is 

 irritated by being touched, it turns its head round and 

 strikes angrily with this appendage at the irritating 

 object, but he could not detect what the effect of this 

 action would be. Dr. Chapman is inclined to think 

 that this organ corresponds to the slit in the larva of 

 G. vinula mentioned at page 146. Mr. Fletcher has 

 found a somewhat similar appendage in P. nubeculosa, 

 and Dr. Chapman has noticed a slight raised ridge in 

 an inflated larva of Glujphisia crenata, and possibly 

 there are others similarly furnished. (J. H., 28, 12, 

 86.) 



