282 ENTOMOLOGY. 



played. Where the view of the compound eyes is a full-face one, the 

 darker pigment is seen so strcngly that its true position is concealed. 

 A profile view shows the little lenses to be clear, like glass, and the 

 pigment to be behind them. (Knowledge, iii. (1883) p. 246.) 



PRESERVATION or ORTHOPTERA. 



Orthoptera can be easily preserved in strong alcohol, and 

 may afterwards be taken out and pinned and set at leisure. 

 If preserved dry they can be killed with cyanide of potas- 

 sium, or ether, without losing their colors, as they would 

 do after remaining long in alcohol. They should be pinned 

 through a little triangular spot between the bases of the 

 elytra, or fore wings, when the wings can be spread to ad- 

 vantage. They are also often pinned through the right 

 wing, as in Coleoptera. In pinning these insects for trans- 

 portation, care should be taken to put in additional pins, 

 crossing each other on each side of the abdomen, and in 

 like manner to steady the hind legs, which are very apt to 

 fall off if too much jarred. 



PRESERVATION OF DRAGON-FLIES, MAY-FLIES, CADDIS-FLIES, 



STONE-FLIES, ETC. 



These net-veined insects of different orders, the young 

 of which frequently live in fresh-water ponds and streams, 

 should be pinned through the centre of the thorax; the 

 smaller and more delicate kinds immediately on capture 

 should be pinned in the collecting-box. 



As regards the preservation of the dragon-flies, Mr. 

 Uhler states that "the large, brilliant green dragon-flies 

 (CorduHna), as well as the yellow, brown-striped Gomphina, 

 having the eyes wide apart, will furnish new species in 

 almost all parts of the country. In order to preserve 

 specimens in the neatest manner it is well to slip them 

 immediately when caught into paper bags of suitable size, 

 first taking care to lay back the wings so that they will be 

 applied together, to prevent mutilation. These paper bags 



