486 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.49. 



be specific, as I have found a similar difference, though less marked, 

 between the opposite sides of an example of Camponotus novehoracensis 

 Fitch.) Measurements in microns: Upper section of basal norvure, 

 560; lower section of basal nervure, 640; lower end of basal nervure 

 to transversomedial, about 1,600; greatest depth of submarginal, 

 1,360; terminal truncation of submarginal cell, 160; depth of marginal 

 cell just above end of submarginal, 512. 



Male. — Anterior wing 7 mm. long; venation as in the female, 

 submarginal cell pointed at end. The small head with very large 

 eyes indicates Oecophylla and not Camponotus. The male is referred 

 to this species because it is of the size to be expected, and agrees in 

 the wing-structure. 



Oligocene at Gurnet Bay (Brodie). Lacoe Coll. 7526 (type); 

 var. a 7550 (on same piece of rock as the type of Protoheris) ; male, 

 7529. 



Holotype and paraty pes. —Cht. Nos. 61420-61422, U.S.N.M. 



OECOPHYLLA MEGARCHE, new species. 

 Plate 65, figs. 1-3. 



FemaZe.— Anterior wing 20.5 mm. long; venation as in the other 

 species; upper section of basal nervure longest (upper about 1,360 n, 

 lower about 910); submarginal cell 6.4 mm. long, pointed at end; 

 marginal cell 6.1 mm. long, and 670 n deep at level of end of submargi- 

 nal; lower end of basal nervure 2.5 mm. from transversomedial. 

 The two sections of the basal nervure being essentially in a straight 

 line in this and the other species, these can be readily distinguished 

 from Dryomyrmex; the direction of the transversomedial distinguishes 

 them from Mycetosoritis, etc. 



Lower wing (on another piece of rock) slightly over 16 mm. long; 

 the venation is shown in the figure. Another specimen shows the 

 head and anterior part of body; the mandibles are long and massive, 

 only feebly denticulate. The head is about 3 mm. wide. 



Oligocene at Gurnet Bay (Brodie). Lacoe Coll. 7525 (type), 

 7568, and 7623. At first sight this seems to be a Camponotus, but 

 the venation of the hind wing is different, and everything appears 

 to indicate that megarche, perdita, and atavina all belong to Oeco- 

 phylla, which has two species in Baltic Amber. 



Holotype and paratype.— Cat. Nos. 61423-61425, U.S.N.M. 



Heer in 1850 described a Formica ohesa, which consisted of two 

 types, F. ohesa radohojana from Radoboj and F. ohesa oeningensis 

 from Oeningen. The Radoboj insect was shown by Mayr in 1867 

 to belong to Oecophylla and is to be known as Oecophylla ohesa. The 

 Oeningen ant, of which three examples from the University of 

 Zurich (Heer's collection) are before me, is evidently not an Oeco- 

 phylla, but from the general build and appearance should be called 

 Camponotus oeningensis. It has priority of place over C. heracleus 

 (Heer), which is possibly its male. 



