The Number of Moults in Insects of Different Orders

I t will be seen from the data here presented that the number of moults is as a rule greatest in metabolic insects wi th the longest lives, and that an excessive nuniber of e c d y s e ~ is due to some physical cause, such as lack of food combined with low tempesat~~re. 111 Campodea there is a single fragmentary moult (Grassi), while the Collen~bola {Afamoioma $ZumJea j shed their skin througl~out life. (Sonmer.) I n the winged insects, especially Lepidoptera? the n ~ ~ m h e r of moults is dependent on climate. Insects of wide clistsibution growing faster in warmer climates conseq~ ie~~ t ly shed their s l i i ~ ~ ~ oftener; for example the saine species inay moult once oftener in tlte southern than in the northern states, as in the case of CuUosada $mtae thec~~ vvhic11 in West Virgiuia is do~~ble-brooded. Hibernating larvae mo~i l t once oftener than those of the suinnxr brood (Edwards). Weniger by rearing the larvae of Aeiheraeu mylit iu and E a d a im' $ w i d i s , and ~ h k l i when reared under normal conditions actudly 11a17e the six stages, when seared in a warm moist atmosphere of about 25' C. have but five stages, i. e., moult but four times. In the hot and moist d ima te of Ceylon,