ashmkad: {'Lassikication of the chalcid flies 347 



Tribe II. PtcroiJtricini. 



This tril)e is separated from tlie former V)y having 4-jointe<l tarsi, not five. It 

 forms a transition, or a connecting hnk, between the subfamiHes Aphel ini )iir Sind the 

 Tctnisfccliiinr, some of its nienibers are easily mistaken for some of those of the 

 hitter. 



The very short, or nearly obsolete, stigmal vein, and the absence of the meso- 

 sternal fuiTow, will, however, readily distinguish them. 



The species attack iirinciitally tlie mealy-winged plant-lice, family Afciinididw. 



TABLK OF UENEKA. 



1. Females 2 



Males 3 



2. AnteniKC S jointed, normal, the last joint very short. Pteroptrix Westwood (type P. dimidiala Westw.). 

 Antennic S-joioted, with 2 minute ring-joints, the last joint, or the club, greatly lengthened. 



Eretmocera Haldeman (type E. corni Haldeman.). 



3. Antennse 8-jointed Pteroptrix Westwood. 



Antenna 3-jointed (or 4-jointed with a ring-joint), the last joint very long. Eretmocera Haldeman. 



SuiiFAMiLY III. Tetrastich IN. E. 

 1(S56. Tetrastichoida\ I'aniilie 21, Forster, Hym. Stnd., II,, pp, 26 and 83. 

 1878. Tetrastichina, Tiibus, Thomson, Hym. Skand., \'., p. 180. 

 1886. Tetrastichina% Subfamily, Howard, Ent. Amer., I., p. 199 ; II., p. 98. 

 1897. Tetrastichinte, Subfamily 111., Ashmead, Proc. Ent. Soc. Washington, IV., 

 p. 249. 

 This sulifamily is closely allied to the Aphcliniir.r, and some of the smaller 

 species falling in it, are easily confused with many in the ApJicliu'mi, if attention is 

 not given to the difference in the length of the stigmal vein. 



TABLE OF TKIBIOS. 



.Vbdomeii distinctly petiolatc ; hind wings witha hjng, clavat,' marginal vein Tribe 1. Ceratoneurini. 



Abdomen .sessile or subsessile ; hind wings with a slender marginal vein Tril)e II. Tetrasticbiui. 



TkiI!E I. Cfniloiiinrini. 

 Tiu' distinctly petiolatc abdomen, and the long clavale mnrginnl vein in the hind 

 wings, found in no other ti-il)e will distingnisii the triiie at a glance. 

 Only one genus is known : 



Antenna' lO-jointed, with two ring-joints; lace witli sti-ia' converging towards the mouth. 



Ceratoneura .Vsbmead (type ('. iirlioUda Ashm.). 



Tiu he 1 1. TclraMidi in i. 

 The sessile or subsi'ssile abdomen, and the difference in the ventition of the hind 

 wings ,se])arate tills tribe from the C'l-raloiicKriui. The scutellum lias usually /oh/- 



