Why did not Mr.

Westwood correct St.

Fargeau and Serville in the instance adduced by him of the Musca pipiens ? Is not the establishment of a generic name in the Diptera upon such easy conditions as sure a guarantee of immortality, as may be compassed by thrusting Mr.

Curtis on one side in the Hymenoptera, pushing Latreille into his place, justling Jurine into the situation of Latreille, and then very de- murely getting into Jurine's warm seat? There are many reforms he can introduce upon this principle; but he cannot always substitute his own names ; although, in some instances, he may.

In the present, he is certainly at fault : yet, whether his name must not stand in lieu of Jurine's, is, perhaps, a question of courtesy, rather than of right ; but, even if so, it was, I think, my privilege to name it, as I had laboriously worked out the entire group ; and he should have had the civility to allow me to do so, instead of interpolating his Dineurus.