Natura biografie; la vita di alcuni di ogni giorno le farfalle; tarme; cavallette e vola . ld non hanno un luogo più sicuro per passare l inverno a chedove hanno sviluppato. Di conseguenza essi seguire l'esempio dell'ospite spe-cies nel rimanente in scale trala come larv^ finché theapproach della molla. Thenthey pupate e presto emergeas mosche. Questa valutazione gall-fly appartiene alla stessa famiglia di altre. Entomologi chiamata albovittata itCecidomyia. Se si esaminano attentamente le mosche si parte posteriore nei vasi è probabile trovare alcuni abbastanza diverso dagli altri. I loro corpi sono più piccoli e co

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Nature biographies; the lives of some every-day butterflies; moths; grasshoppers and flies . ld have no safer place to pass the winter than thatwhere they have developed. Consequently they follow the example of the host spe-cies in remaining in betweenthe scales as larv^ until theapproach of spring. Thenthey pupate and soon emergeas flies. This guest gall-fly belongsto the same family as theother. Entomologists call itCecidomyia albovittata. If you examine carefully the flies you rear in the jars, you are likely to find some quite different from the others. Their bodies are smaller and more compact, and they have four wings instead of two. These are parasites, upon one or the other of the Cecidomyias, perhaps both. So you see that even this elaborate summer and winter shelter does not keep them safe from all enemies. The beetles form the great order Coleoptera, whichincludes many families and a vast number of species.The larv^ of many of these, especially such as burrowin the soil or in trees and logs, may readily be foundduring the winter months. Many of these require at 150. Fig. 135.—The Oak-plum Gall. Insects in Winter. least two years to complete their development so thatthey must pass at least one winter in the larval condi-tion. The beetle larvae are not silk spinners, so theycannot make hibernation cases like those of many ofthe Lepidoptera; consequently they are seldom to befound save where they are protected by some other sortof shelter. The easiest place to find the larv^ of the Hymenop-tera in winter is in the numerous galls which they makeupon various plants. The oak-plum gall ^ shown in Fig-ure 135 will serve as an example of these. This curiousgrowth develops on the outside of the acorn cup. Inautumn it is of a bright red colour. Inside, it is of aspongy texture, with the larva in a little cell of hardertissue in the centre. The outer portion becomes denseras the season advances, so that in winter the gall isoften very hard. The little black fly int

Parole chiave associate all'immagine

• bookcentury1900
• bookdecade1900
• booksubjectinsects
• bookyear1901