294 



INSECTA. 



described hereafter, peculiar facilities for gratifying its bloodthirsty 

 disposition. 



(762.) In other orders, the wings are always unequal, the posterior, 

 and sometimes both pairs, not unfrequently being wanting. 



Fig. 146. 



Dragon-fly- 



a. Mouth adapted to sucking. 



(763.) 5th Order. Diptera*. Instead of posterior wings, we find 

 in this order pedunculated appendages called halteres or poisers. The 

 mouth contains a soft proboscis, and is usually armed with several setae 

 and provided with a pair of palpi: of such the common House-fly 

 affords a familiar instance. 



(764.) 6th Order. Lepidoptera-f. The insects belonging to the 

 Lepidopterous order are possessed of four wings, which are generally 

 covered with microscopic scales, frequently exhibiting the most beau- 

 tiful colours. The larva? are provided with feet and a distinct head ; the 

 mouth of the perfect insect is a long spiral proboscis. 



(765.) The Butterflies, so conspicuous for their beauty, are well-known 



diTrre/oos (Sis, Trrepov), with two wings. 



AeTris, a scale ; Trrepov. 



