JUNE. 175 



spots on the upper wings. The larvae of this insect is well 

 known as discharging a kind of frothy matter, called by coun- 

 try-people " cuckoo-spit," in the midst of which they gene- 

 rally Uve, and find in it a protection against their enemies : 

 perhaps also this moisture may defend them from the sultry 

 beams of the sun. Some of the family possess the power of 

 making a chirping sound, which has been celebrated by many 

 poets ; and in reference to its being produced only by the 

 males, an old B-hodian bard says, 



" Happy the Cicada lives. 

 Since they all have voiceless wives." 



DiPTERA. CESTRID^. 



OESTRUS. 



Generic Distinctions. — Antennce very short ; proboscis ^mA palpi 

 obsolete j thorax smooth ; body in the female very long. 



(EsTRUS EQTJi. Head yellowish -white ; thorax yellow, 

 with elevated liairs on a bluish point ; the end of the body 

 is reddish, with two black spots ; the wings have a band in 

 the middle and two small black points at the extremity. 



These insects have the appearance of large Plies:; their 



