JUNE. 175 



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

 known as discharging a kind of frothy matter, called by 

 country-people " cuckoo-spit/ ' in the midst of which they 

 generally live, 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 Ehodian bard says, 



" Happy the Cicada lives, 

 Since they all have voiceless wives." 



DlPTERA. CESTRHLE. 



OESTRUS. 



Generic Distinctions. Antenna very short ; proboscis and jpalpi 

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



(ESTRUS EQUI. Head yellowish-white ; thorax yellow, 

 with elevated hairs 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 Flies ; their 



i 



