ENTOMOLOGICAL NOTES. 

 II. 



BY SAMUEL H. SCUDDER. 

 From the Proceedings of the Boston Society of Natural History, "Vol. XII, 



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

 he had made during the summer, upon the reproduction of 

 lost limbs in the Walking-Stick, Diapheromera femorata. 



If a leg is cut oif beyond the trochanto-femoral articulation, the 

 parts remaining outside of this joint are dropped before the next 

 moult, and are then renewed, either by a straight short stump, in 

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

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

 nearly complete circle ; if the former, 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 place, 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 peUicle 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 

 from a cluster of eggs of (Edipoda Carolina^ a considerable 

 number of Chalciditans of a species apparently undescribed. 

 He believed this to be the first recorded case of parasites 

 living in the eggs of an Acrydian. 



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