10 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.64, 



of the more basal ones) square, or broader, in the manner of Aniso- 

 pleura. Other characters not visible. 



Genotype. — Epallagites avKS, new species. 



EPALLAGITES AVUS. new species. 



Plate 1, fig. 4. 



Head about 5 mm. broad ; about 1.4 mm. between eyes on vertex ; 

 thorax about 6 mm. long, as preserved black without bands ; abdomen 

 very slender, but only partly preserved. Wings hyaline, the veins 

 not very dark ; base to arculus 4 mm. ; arculus to nodus about 9 mm. 



Horizon and locality. — Green River (Eocene) shales at head of 

 Salt Wash, Roan Mountains, Colorado, collected July, 1922 (Cock- 

 erell). The locality is a large excavation, probably 150 meters (500 

 feet) below top of hill, which we called Station 2. 



Holotyjje.— Cat. No. 69180, U.S.N.M. 



In Tillyard's classification, this will fall in the tribe Epallagini, 

 except for the fact that the arculus is not so near the base. The 

 wings can hardly be described as petiolate, though they are not 

 broad. On the whole, Epallagites falls between the Epallagini and 

 Libellagini, and possibly these tribes were not so clearly separated in 

 the Eocene as at present. The most nearly related genus in the 

 American Eocene is Protamphipteryx, but this belongs to Tillyard's 

 tribe Amphipterygini. The definition which he gives of that tribe 

 ne^ds to be amended to admit the Oriental genus DevadatFa Kirby, 

 in which the arculus is actually nearer the nodus than to the base of 

 the wing. 



The discovery of a second genus of EpallaginEe in the Green River 

 Eocene is of particular interest because the subfamily not only shows 

 some very primitive characters, as Kennedy has remarked, but is 

 actually the oldest of the living Zygopterous groups. Two genera 

 from the Jurassic, Euphaeopsis and Psendoeuphaea of Handlirsch, 

 are placed in the Epallaginse, though it must be confessed that they 

 need further investigation. 



HYMENOPTERA. 



AMASIS BYRAMI, new species. 



Plate 2, fig. 5. 



Length slightly over 8 mm.; width of head slightly over 2 mm., 

 of the thorax about 3 mm., of abdomen 3.2 mm.; head and thorax 

 dark brown; antenna 5-jointed, strongly clavate, pale brown; wings 

 clear (venation not visible) ; abdomen pale, the sutures beyond the 

 middle dusky. Length of antennal joints in microns: (1) about 320, 

 (2) 112, and broader than long. (3) 560, (4) 240, (5, club), 830, and 



