382 FROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxii. 



It is at once distinguished by the very minute, short, usually puncti- 

 form marginal vein, which is not or scarcely longer than thick, and the 

 nou-developed or extremely short post marginal vein, similar to Copido- 

 soma Eatzeburg. 



Its other characters, however, are quite different from that genus, 

 the face being short, the anteunal characters and punctuation being 

 characteristic. It conies closest to Prionomastix Mayr, but its cephalic 

 and antennal peculiarities, made use of in my table, readily separate it 

 from this and allied genera. 



Judging from their hosts, the European species Encyrtus notodontcc, 

 E. tardus Eatzeburg (= E. omdorum Forscolomb) and E. emhryophagus 

 Hartig, probably belong here. 



Our species are are as follows: 



I. OOENCYRTUS ANAS^ Ashmead. 



Encyrtits aiiasiv AsiiMEAD, Bull. No. 14, U. S. Dept. Agric, Div. Ent., 1887, p. 23, 

 female. — Ckesson, Syn. Hyni. N. A., p. 312. — Dalla Tokre, Cat. Hym., V, 

 1898, p. 254. 



Tyiw.— Cat. No. 2853, U.S.N.M. 



Habitat. — Florida. 



Host. — Ehynch.: Eggs Anasa tristis De Geer. 



2. OOENCYRTUS CLISIOCAMP^ Ashmead. 



Encyrtus clisiocampo} As]IMEAD, Bull. Ohio Exp. Sta., 1, 1893, p. 163, female and 

 male.— Dalla Torke, Cat. Hym., V, 1898, p. 2.56. 



Type.— Gat. ISTo. 4750, E.S.KM. (Ashmead collection.) 



Habitat. — Ohio. 



Host. — Lepid.: Eggs CUsiocampa disstria Hiibner. 



3. OOENCYRTUS GARGARIS Walker. 



Encyrtus gargaris W^uiHK, Ain\. Mag. Nat. Hist., XII, 1843, p. 47, male.— Dalla 

 Torre, Cat. Hym., V, 1898, p. 259. 



Habitat. — West Indies: St. Vincent. 



4. OOENCYRTUS JOHNSONI Howard. 



Encyrtus jolinsoni Howard, Can. Ent., XXX, 1899, p. 18. 

 T^i^e.— Oat. No. 1424, U.S.N.M. 

 Habitat. — Maryland. 

 Host. — Ehynch. : Eggs Murgantia histrionica Hahn. 



58. PSYLL^^PHAGUS Ashmead, new geiiLis. 

 (Type, Encyrtus pacliypsyllw Howard.) 



This genus comes closest to Ooencyrtits, but is at once distinguished 

 by the broader vertex, the position of the lateral ocelli, and the distinct 

 but short postmarginal vein, as pointed out in my table. 



The species belonging to it seem to confine their attacks to nymphs 

 in the Homopterous family Psyllidfe. 



The following are the known species in North America: 



