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bellula they agree with those made by Siebold (Germ. Zeit. Ent. ii, 

 p. 421). The male of Libelhda, it is stated by Siebold, retains its 

 hold to the female and directs her movements while ovipositing. 

 Miiller (Ent. Mon. Mag. viii, p. 127) notices the method of ovipo- 

 sition of L. flaveola and confirms the assertions made by Siebold. 



Although I have seen scores of L. pulchella, L. auripennis, 

 L. semifascia, and many other species in the act of oviposition, the 

 females were always destitute of the males, and only in one instance 

 I saw a male retain its holci on the female while laying her eggs. 

 The Q^^ of IJbelluIa auripcnnis is irregularly oval with very fine 

 granulations, sordid white and semi-translucent, becoming amber- 

 yellow before the young larva emerges. Length, ^3 mm. ; width, 

 % mm. A number of eggs which were laid on July 23d, at 6.30 

 P.M., disclosed the young larvae on August ist. The ^'g^ of Li- 

 belhila pulchella is very similar to that of L. auripennis, in fact 

 cannot be distinguished from it. except that it is a little more irreg- 

 ular in shape. Length, ^3 mm., width, Y^ mm. Laid July 23d at 

 6 P.M. Young larva emerged July 30th. 



The mode of oviposition of Platytheniis (P. tii'inacidata) and 

 Dip/ax [D. berenice and D. rubicundula) is identical with that of 

 Libellula. The 0.%^ of the former is elliptical, or sub-elliptical, 

 granulated, semi-translucent, pale yellowish white granulated, and 

 before hatching becomes amber-yellow. Length, y^ mm. ; width, 

 y'l mm. Laid July 13th at 5 P.M. Young larva emerged July 23d. 

 The eggs ot the two latter species are oval, yellowish white, semi- 

 translucent, and slightly granulated. Length, Y-z mm. ; width, \ 

 mm. Laid August 12th. Young larva emerged August 22d. The 

 habits of Calopteryx, Agrioii and Lestes, difter entirely from that 

 of Libellula'. They deposit their eggs in a groove made by the 

 ovipositors along the stems of water plants. Both Agrion and 

 Lestes sometimes go beneath the water to lay their eggs. 



Siebold (Wiegm. Archiv. pt. i, p. 205, 1841) observed a female 

 yEschna clinging to a plant dipping her body beneath the water and 

 rubbing it up and down along the stem. Mr. W. T. Davis once saw 

 a female y-Esclma verticalis go below the surface of a slow flowing 

 spring, but has not seen the species deposit an egg, as is stated in 

 one of the volumes of the ' ' Zoological Record. ' ' I have seen at 

 Sandy Hook, N. J., a species of Aischiia laying eggs in the same 

 manner as Libellula with the male directing her movements. 



The best time I found to make observations and to capture the 

 different species of Odonata is between sunset and dusk, or on a 

 day partly clouded. 



