1868.] 99 [Scuddor. 



Mr. S. H. Scudder gave the results of some experiments 

 lie Imd made during the summer, upon the reproduction of 

 U)st limbs in tiie Walking-Stick, Diapheromera feniorata. 



If a leg is cut off beyond the; truchanto-femoral articulation, the 

 parts remaining outside of this joint are dropped before -tlie next 

 moult, and are then renewed, either by a sti-aight short stump, in 

 which the articulations are already observable, or by a miniature leg, 

 the lemur of which is straight, and the tibia and tarsi curved into a 

 nearly complete circle; if the t()rmer, the leg assumes, at the next 

 moult, the appearance it would have had in the second case; the 

 latter form is always changed at the succeeding moult into a leg re- 

 sembling the normal limb in every respect, excepting size and the 

 absence of the fourth tarsal joint. If the leg is removed anterior to 

 the trochanto-femoral articulation, the limb is never replaced. 



The growth of the limb takes j)lace, as in the uninjured limb, dur- 

 ing the moult; a leg, of the full size attained during any one stage, is 

 drawn directly out of a pellicle representing the size of the leg in the 

 previous stage; the same thing occurs when the animal leaves the 

 egg; in the egg the mesothorax and metathorax are scarcely larger 

 than the prothorax, thus enabling the femora, which are widely sep- 

 arated in the escaped insect, to lie close together, as in other insect 

 embryos; but by the time the young insect has fairly emerged from 

 the egg, the thoracic segments have attained the normal proportions 

 of the adult animal. 



Mr, Scudder also stated that he had recently ' obtained 

 fi^jm a cluster of eggs of (Edipoda Carolina^ a considerable 

 number of Chalciditans of a sjjecies apparently undescribed. 

 He believed this to be the first recorded case of parasites 

 living in the eggs of an Acrydian. 



October 7, 1868. 

 The President in the chair. Forty-one members present 



Messrs, William E. Endicott of Canton, George E. Hatton 

 of Dedham, William M. Snow of Cambridge, and Charles 



