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Crossings of these species took places in 1880, and, as I stated before, the ova obtained from a long pairing between a Ceanothi female with a Gloveri male, were the only ones which were fertile. The Gloveri cocoons received in 1880 were of a very inferior quality, and produced moths from which no pairings could be obtained, although some crossings took place.
The larvae of Samia cecropia, S. gloveri, and S. ceanothi, are very much alike; and hardly any difference can be observed in the first two stages.
Three North American silk-producing bombyces, very closely allied, have been mentioned in my previous reports; they are; Samia ceanothi, from California; Samia gloveri, from Utah and Arizona; and Samia cecropia, commonly found in most of the Northern States the latter is the best and largest silk producer.
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