51 



treeg by means of a pen-knife : they are, for 

 the most part, minute, especially the males^ 

 which are furnished with wings, and from their 

 diminutive size are not easily detected, except 

 narrowly watched ; and should he sought for in 

 those situations where the females are found in 

 abundance : like the Aphides, they are only 

 seen on certain plants, and from the observa- 

 tions of Naturalists, it appears that each species 

 of plant has its peculiar Aphis and Coccus. We 

 should advise that the same method be adopted 

 in preserving the Cocci as mentioned for the 

 Aphidse. 



The Fulgora and Cicada may be pierced with 

 a pin, or put into spirits, unless the bodies are 

 very cottony, which is the case with many ; and 

 when this occurs, we should advise that they be 

 pierced on the spot, and placed in the collecting 

 box. 



Order 13. HEMIPTERA. Rostrum attached 

 to the anterior extremity of the head ; elytra 

 somewhat crustaceous or coriaceous, with the 

 apex membranaceous, placed in a horizontal di- 

 rection, one decussating the other ; thorax with 

 the first segment (which bears the feet) larger 

 than the following one ; haustellum with three 



