Cerocomae, Mylabres and Zonites 



placed the pseudochrysalids that remained on 

 a layer of fresh sand at the bottom of a glass 

 receiver. Direct exposure to the sun was im- 

 practicable : it would have been fatal at a 

 period when life is subterranean. To avoid 

 it, I tied over the mouth of the receiver a 

 few thicknesses of black cloth, to represent 

 the natural screen of sand; and the apparatus 

 thus prepared was exposed for some weeks 

 to the most brilliant sunshine in my window. 

 Under the cloth cover, which, owing to its 

 colour, favours the absorption of heat, the 

 temperature, during the day-time, became 

 that of an oven; and yet the pseudochrysalids 

 persisted in remaining stationary. The end 

 of July was near and nothing indicated a 

 speedy hatching. Convinced that my at- 

 tempts at heating would be fruitless, I re- 

 placed the pseudochrysalids in the shade, on 

 the shelves, in glass tubes. Here they 

 passed a second year, still in the same con- 

 dition. 



June returned once more and with it the 

 appearance of the tertiary larva, followed 

 by the nymph. For the second time this 

 stage of development was not exceeded; the 

 one and only nymph that I succeeded in ob- 

 taining shrivelled, like those of the year be- 

 fore. Will these two failures, arising no 

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