55 



be easily captured, either with the forceps or 

 net. The JEstridcB orBots, when in the larva 

 state, cause the large pustules frequently to be 

 seen on the backs of cattle ; but many of the 

 perfect insects deposit their eggs on the hair of 

 the animal, and pass into the stomach in con- 

 sequence of its licking itself : the pupse of the 

 latter will be found in the dung of horses at 

 certain seasons of the year ; others in the larva 

 state inhabit the frontal sinuses of sheep and 

 deer, and the perfect insects will be found on 

 stones and places contiguous to the resort of 

 these animals. The insects of this order should 

 be pierced as soon as taken : no further prepa- 

 ration is requisite. 



Order 16. OMALOPTERA. Mouth with man- 

 dibles and maxillss ; lip simple ; wings two or 

 none. [PL III, fig. 8.] 



The Forest Fly, Sheep and Swallow-tick, arc 

 of this order ; there are many other species in- 

 habiting both quadrupeds and birds: very few 

 exotic species are known ; those found on the 

 camel and tiger, however, have been described. 



Having now concluded our directions for col- 

 lecting insects, it may not be amiss to add some 

 observations by Mr. W. Macleay, relating to 

 the insects of Java collected by Dr. Horsfield: 



