[5f>] 



COLLECTING AND PRESERVING INSECTS RILEY. 



the most part stationary, being fixed to the plant by the protecting, 

 waxy, excretion or scale, The Flea-lice (PsylUdcv) frequently produce 

 galls, and these should always be collected with the insect architects. 

 Some species do not pro- 

 duce galls, and may be col- 

 lected by sweeping. The 



Hackberry is infested by 



/ \ 

 large numbers of species of 



1 's vllids, and these produce 



a great variety of interest- 



ing galls. The Aleurodida^ 



(Fringe-scales) are delicate 



insects, and easily injured 



in the taking; they are 



therefore best reared from 



their stationary and fringed 



larvae and pup*, which oc- 



cur on the leaves of many plants. Leaves bearing the latter should also 



be collected and pinned or preserved in alcohol. The Parasita, the 



FlG - 7fi - Tlie Bea ' bu ^ canthia 



adult enlarged. 



a, young; 



Fie;. 77. The Short-nosed Ox-louse (Htfinatopiniis eurytsternux). a, female; b, rostrum; c, ventral 

 surface, last segments of male; d, female; e, egg; /, surface of egg greatly enlarged. 



lowest representatives of the order, may be obtained from the domestic 

 and wild animals which they infest. 



COLLECTING DIPTERA. 



Most Diptera frequent flowers and may be collected with a sweeping 

 net without much difficulty. The best season is from April to June, 

 and the bloom of the Willow, Alder, Plum, Cherry, Dogwood, Black 

 berry, etc., will ordinarily yield a bountiful supply of specimens and 

 species. Parasitic and saprophytic forms may also readily be obtained 

 by breeding, the former as in the case of the parasitic Hymenoptera, and 

 the latter from decaying vegetable matter and fungi. The IHptera 



