M. Latreille on the Geographical Distribution Insects, 51 
cea, glabra, lucida. Flores parvi, albi, pedicellati, in corymbis 
terminalibus numerosi. 
Sp. 1. buxifolium. 
Leiophyllum buxifolium. Elliott ji. Carol, et Georg. 1. p. 457. 
Leiophyllum thymifolium, Persoon Syn. 1.^. 477. Ammyr- 
sine buxifolia. Pursh.Jl. Amer. sept.l, p. QOl. Bot, Regist. 
t. 531. Ledum buxifolium, Hort. Kew. %p. 65. Berg. Act. 
Petrop. 1777. p. S13. t. 3. /. % Willd. sp.pl. 2. p. 602. 
Mich. jl. Amer. hor. 1. p. 260. Ledum thymifolium, Lam. 
Encycl. 3. p. 459. illust. gen. t. Q6^.f. 2. 
Art. IX. — On the Geographical Distribution qf Bisects. By 
M. Latreille. (Concluded from Vol. V. p. 378.) 
lepidopterous insects, which form particular groups, 
and a variety of other species, will remain a long time un- 
known. All the successions of species spread themselves gradu- 
ally from east to west, and reciprocally. Many of those which 
are found in the provinces of Normandy and Brittany, inhabit 
also the southern parts of England. The departments situated 
on the left bank of the Rhine, to the north, have, in this respect, 
a community of species with the neighbouring provinces of Ger- 
many. Some of the Levant species, such as the Cantharis ori^ 
entalis, the Mylahris crassicornis^ a beautiful variety of the Me" 
lolontha occidentalism brought by Olivier, and some of the diur- 
nal Lepidoptera, appear to have travelled tovv^ards the west, and 
to have established themselves in the Austrian territory, near Vi- 
enna. It appears to me, from the collection made by that cele- 
brated naturalist in Asia Minor, in Syria, in Persia, &c. that 
the insects of these regions, though nearly allied to those of the 
south of Europe, are , yet, at the same time, for the most part, 
specifically distinct. I have the same opinion in regard to those 
of southern Russia and the Crimea. The insects of the coasts 
of Coromandel, of Bengal, of southern China, and even of Thi- 
bet, of which some have been communicated to me by my liberal 
friend Mr Macleay, have many points in common with each 
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