ARACHNIDA. 249 



and wings of the butterflies and moths, for then 

 their value is greatly diminished. 



Beetles should always be pinned through the 

 right elytrum, or wing case, so that the pin may 

 come out between the first and second pair of 

 legs ; but all other insects may be pierced ver- 

 tically through the thorax. Great care must 

 also be taken that the boxes containing the in- 

 sects be left in a dry situation, and the sooner 

 they are transmitted to England the better, pre- 

 viously applying to the inside of the boxes a 

 small quantity of powdered arsenic or camphor, 

 to prevent the attacks of small insects. 



Arachnida. Spiders, Scorpions, and Acari are 

 best preserved in spirits, as well as the Myria- 

 poda, including the Juli, Scolopendrse, and other 

 individuals of the order ; but they may be pierced 

 through the thorax (the intestines being carefully 

 removed and replaced by cotton), and pinned 

 tight in boxes, as the insects. 



Crustacea. The marine species may be killed 



