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REVIEWS. 491 
Embryology of the Hemiptera (Aphis, Aspidiotus, Corixa), and Simulium, 
and the viviparous Cecidomyian larva," which were printed in Siebold 
and Kólliker's Journal, in 1866 
At the meeting of the American EPEN in August, 1867, the writer 
presented a paper on the Development of a Dragon-fly (Diplax), an illus- 
trated abstract of which appeared in "i NATURALIST, vol 1, p. 676. His 
Alex. Brandt presented to the Imperial Academy of Econ 
of St. Petersburgh, a paper entitled “Contributions to the Developmen- 
tal History of the Libellulide (Calopteryx and Agrion) and Hemipirs, 
With especial reference to the E Embryonal integument” (blastoderm). 
With these two papers, the latter relating to the earliest changes in the 
eggs of Dragon-flies, and the former to the later stages in the life of the 
io b 
have appeared by Newport, Van Beneden, and others. We have already 
in the present volume of the NATURALIST, quoted iom the abstract of 
Robins’ paper on the ** Development of Mites,” quoted from the ** Comp- 
tes Rendus” of the French Academy. 
d now notice the last work on the embryology of insects, that 
published in 
tovum, dm, hitchi out; ^ "d mandibles; mz, maxille; p", ena pair of 
d 
rudiments of the simple eyes; m, beak, hh’, rudimentary stomach and 
liver). From this deutovum (which is not the «amnion" of insects), is 
developed a six-footed larva. This larva passes into an eight-footed 
form, the « veis larva" (the nymph” or pupa, of Dujardin and Robin) 
Which trans rms into the adult mite. The pupa differs from the adult in 
ce feet, and four instead of ten genital nee cups, the 
latter being the usual number in the adult. 
