ZOOLOGY* 205 



22. Elator. Antennce setaceous, or pectinated, in some 

 species assuming a fan-like appearance, fig. 18, plate 3, 

 protruding from a groove beneath the head; 6oc(y 

 oblong, the under side of the thorax terminating in an 

 elastic spine^ placed in a cavity of the abdomen : by 

 means of this apparatus, the insect, when placed on it» 

 back, springs up and recovers its natural position. 



23 Cincidella. AntenntB setaceous ; jaws prominent, 

 toothed ; eyes projecting ; thorax roundish, margined. 



Most species in this genus are extremely ferocious, devour- 

 ing all other insects that they can overcome ; their usual 

 haunts are dry meadows, and sandy banks • and are only to 

 be seen on wing during the hottest part of the day, while the 

 sun shines. Their larvae lurks in holes in the sand, and 

 like the perfect insect, devours whatever insects it over- 

 powers. 



14. Buperiris. Antennce glender, serrated, the length of 

 the thorax ; head partly hid beneath the thorax. 



This is a most brilliant genus, many of the species rival- 

 ing in brilliancy the most highly polished gold or copper, 

 they feed on vegetable substances; their larv» is found in 

 decaying trees, and in timber. 



25. Di/tkus. Antennce setaceous ; hind-legs hairy, formed 

 for swimming, and terminated by very minute claws. 



The whole of this genera are aquatic. 



