x3 



THE ORDERS OF INSECTS. 



however, belong to the genus dZschna and its allies. y". Grandis 

 is a large brown species, measuring four inches in length, and 

 even more across the wings, which are deeply tinged with 

 yellow. The small species of Agrion, etc., with their slender 

 blue, red, and brown bodies and delicate wings, often do not 

 measure more than an inch and a half across the wings, and are 

 generally found resting on the leaves or stems of water-plants. 



Dragon Fly (Ltbelhilct Dcpressa), natural size. 



The Lace- winged Flies (Chrysopa) are green flies, often found 

 among bushes, with four transparent wings, something like those 

 of a dragon fly ; but they are much smaller, measuring about 

 three-quarters of an inch across the wings. Their bodies are 

 slender, and comparatively short ; and notwithstanding their 

 beauty, they emit a very disagreeable odour. Their larvce feed 

 on plant-lice (Aphides'). 



The May Flies (Ephemera} are found about running streams. 

 They have long fore wings, about an inch and a quarter in 

 expanse, and very short hind wings. Their tail ends in two or 

 three long filaments, often quite as long as the body. 



The genus Perla, including the Stone Flies, is intermediate 

 in appearance between the May Flies and the Caddis Flies. 

 The hind wings are nearly as long as the fore wings, the antennae 

 are long, the body rather broad and flattened, and the abdomen 



