Vol. XXlv] ENTOMOLOGICAL NEWS 43 1 



tioned does not seem clear. Dr. Calvert suggested that a 

 series of observations on these migrations should be made in 

 the same way that the birds are studied. 



Meeting of June 9, 1913. Dr. Philip P. Calvert, president, 

 in the chair ; eight persons were present. 



Mr. Laurent said he had raised Paratenodera sinensis to 

 see how many nymphs would be produced from each egg- 

 mass. They produced as follows: 150 from the smallest and 

 300 from the largest. Each mass was kept in a separate box. 



Mr. A. N. Caudell, of Washington, D. C, said Stagmoman- 

 tis Carolina varied greatly in abundance in the vicinity of Wash- 

 ington in different years. During some years it was quite 

 difficult to find any specimens of this species. He referred 

 to a small collection of Orthoptera made in north Peru, east 

 of the Andes, and nearly all proved to be new. Another col- 

 lection from just over the divide did not show nearly as many 

 new forms. This shows a niarked geographical barrier: 



He also spoke of his method of keeping types in Riker 

 mounts and explained its utility, and said the safety of the 

 type preserved in this way appealed to him. Mr. Rehn said 

 the thing one wished to see in a Riker mount was usually 

 covered up. He also objected to cotton in contact with a 

 dry specimen. 



Mr. Rehn made some remarks on the geographical distri- 

 tribution of the genus Arethaea, nine species of which are 

 found in the arid and semi-arid region of Texas. There is 

 an isolated form found in Florida. He spoke of the com- 

 parative anatomy of the genus in relation to their systematic 

 differentiation. The group characters were also explained. 



Mr. E. T. Cresson, Jr., stated that Mr. E. G. Vanatta had 

 reared Scenopinus glabrifrons from the Mediterranean Flour 

 Moth, Bphestia knehniella. 



Dr. Calvert exhibited a female specimen of Tetragoneuria 

 (Odonata) arrested in transformation, which he had found 

 on a wooden post on the bank of the Rancocas Creek, above 

 Mt. Holly, N. J., June 3. 1913. The wings of the right side 

 were still partly within the wing-pads of the exuvia and so 

 held the imago fast ; the wings of the left side were free but 

 not completely expanded. When found, the insect was able 

 to move its legs and the left wings ; the head, thorax and 

 abdomen were well formed and well colored. Fonr ants, how- 

 ever, were engaged in feeding on the abdomen, so that only 

 the first five segments were intact, the others being more or 

 less destroyed. The ants were secured and had been com- 



