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Published online by Cambridge University Press: 10 July 2009
As some confusion exist in the minds of medical men in the Malay States as to the differentiation of the Anophelines ludlowi and rossi* it is probably worth while to give the following comparative notes of the two species, particularly as I believe that the larva of ludlowi has been previously held to be indistinguishabla from rossi, whereas it is in reality very distinct.
* Our so-called rossi may prove to be distinct from rossi, Giles.
* As a certain amount of confirmation we may note that if either ludlowi or rossi had hatched out in our breeding bottles, on examining the larvae remaining in the bottles, we found in every case, although we need not have expected such favourable evidence, that they were of the type which we now ascribe to the respective species.
In young larvae the distinction between the two species is very fine, and could not be relied on for practical purposes. The similarity is due to the posterior hairs in rossi being placed far apart and further back, much as in ludlowi.