526 Mr. Jolin Scott's Mono(jraph of the 



Tlic l)0>t mctliods I ]ia\o fouiul for tlic (■a])ture of" tliese 

 tiiiv creatui'cs is by sweepino- and by bi'atini>' trees and 

 buslios into a s\vce})ino--iiet or inverted uinl)rella. J then 

 ])nt snch species as 1 liave fonnd on a ])articnlar tree or 

 bnsh or plant into a small glass tnbe, of which 1 carry a 

 qnantity ready labelled on -which to write -with a pencil tlic 

 name of snch tree, bnsh or plant, so tliat when 1 come to 

 set them I am at no loss to know where they came from ; 

 and although three or four species maybe fonnd on one tree, 

 yet 1 believe this is accidental, or for the purpose which I 

 shall mention presently, as each species, like the Aphidcp, 

 seems to liave its special food plant. l)i'. Flor and 

 ]M. Lethieny give many species as fonnd by them upon firs, 

 and these are generally taken in early spring or very late 

 in the season. INIay they not have assembled there for the 

 ])urpose of hibernation, as these trees would aflibrd them 

 an excellent retreat ? The two seasons would seem to 

 point to this. 



In conclusion I may add that I shall be glad to examine 

 and name to the best of my ability any species which may 

 be sent to me for tliis purpose, as I feel certain I have not 

 yet exhausted the riches of the group. 



Family PSYLLID.F. 



Head, including the eyes, generally broader than long. 

 Crown horizontal, or more or less deflected. Ocelli three, 

 placed one in front and one near each eye, close to or almost 

 on the posterior margin. Face Avith or without lobes. 

 Antemue 10-jointed, inserted before the e^yes ; two basal 

 joints stout, generally shortish; remainder filiform; apex 

 of the last joint furnished with two ])rojecting hairs of 

 unequal length. Uycs globose, placed on the side of the 

 head. 



Thorax : pronotum small, collar-shaped ; viesoiwtum 

 large, exposed, very convex, divided laterally into three 

 Tuiequal portions; anterior portion more or less shuttle- 

 shaped, postei'ior portion largest, broad, with a scutelliform 

 ])roccss attached to the posterior margin. Scntcllnm 

 minute, rounded posteriorly. Elytra fully developed in 

 both sexes; longer than the abdomen, and either acute or 

 rounded at the apex; costal margin with or -without a 

 stigma; from the nerve of the external basal cell, whose 

 a])ex reaches the costal margin before the middle, proceed 

 the following nerves, viz., the radius, generallv running 



