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REPORT ON ZOOLOGY, MDCCCXLII : 
upon a moth, Elachista coffeella, which is very injurious to the coffee 
plantations on the Antilles. The caterpillars mine into the leaves of the 
coffee, where, after they have fed from fifteen to twenty days, they spin 
themselves up, three or four in each leaf, and in about a week come out 
from the pupa, so that forty to forty-five days may be reckoned for one 
generation (Institut. p. 185 ; see also Rev. Zool. p. 24, 126, 167). 
DIPTERA. 
Leon Dufour has published some general remarks on the internal struc- 
ture of the Diptera (Institut. p. 169). 
According to his account, the cord of nerves uniting the chain of 
ganglions, is here simple, while in other insects it is double ; he found 
the number of ganglions in Tipula, Culex, Asilus, and Bomhylius, to be 
nine ; in Tahanus, Stratiomys, and Rhagio, seven ; in Syrphus, three ; 
in Conops, two ; and in Musca, only one. 
A new work by Zetterstedt, “ Diptera Scandinaviaa, 1 tom. Lund. 
1842, 8vo.,” is important, partly from the considerable number of new 
species, and partly by the proposed divisions, in which he has taken a 
step well worthy of attention ; however, it is rather uncertain, the 
author having confined his view to the Scandinavian species. The na- 
tural characteristics, either of genera or families, cannot be determined, 
without examining the group in its whole extent and development. 
An “ tibersicht der Zweifliigler Lief-und Kurlands,” has been pub- 
lished by Gimmerthal (BuU. Mosc. p. 639). An appendix contains 
remarks on the recorded species, and descriptions of those newly dis- 
covered. 
“ Dipterologische Beitrage,” by Zeller (Isis, p. 807), contain excellent 
observations and descriptions of several newly discovered species. 
Macquart’s Dipteres Exotiques, vol. ii. part 2, Paris, 1842, will be 
considered. 
Le Guillou has described the new Diptera (seven species) collected by 
him in his voyage round the world (Rev. Zool. p. 314). 
Patterson has made some observations on the appearance of clouds of 
Diptera (Ann. Nat. Hist. x. p. 6). 
CuLiciD^. — Culex australis of the reporter is a new species from 
Van Diemen’s Land (Arch. 1842, i. p. 270). 
Chironomid^. — Zeller (Isis, p. 807) has given his observations on the 
habits of the Hydrohcenus luguhris, Fries {Psilocerus occultans, Ruth., 
Chironomus occultans, Meig.) These small gnats appear in masses, 
in the beginning of spring, on puddles and ditches. They sail on the 
water with their wings, but never fly. 
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