236 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.57. 



ODONATA. 



Family AGRIONIDAE (CALOPTERYGIDAE). 



EOCALOPTERYX, new genus. 



Only the apical part of wing is preserved, but it nearly agrees with 

 Agrion (Calopteryx) , having the same dark fuscous color and white 

 stigma, small cells, and numerous short veins in the marginal area. 

 It differs in having the stigma well defined, vrith a strong border, 

 and perfectly regular, except that it is* somewhat convex below. 

 Beyond the stigma is a single cell, then five pairs of cells, and last 

 two single cells. In the apical region, about four little veins reach 

 the margm in a distance of 1 mm. In outline, the end of the wing 

 is not nearl}^ so broad and obtuse as in Agrion, but has the shape of 

 Pseudo'phaea. The stigma, however, is short, whereas in Pseudophaea 

 and other related genera it is very long. It is not often that an ex- 

 tinct genus appears to be the immediate ancestor of a living one; but 

 the present insect may fairly be regarded as ancestral to Agrion. 



Type. — -Eocalopteryx atavina, new species 



EOCALOPTERYX ATAVINA, new species. 

 Plate 32, fig. 2. 



Breadth of wing, 8 mm., from apex, 8 mm.; stigma, 2.6 mm. long, 

 very oblique, the side on costa 2 mm.; depth of stigma, about 0.7 

 mm. Although the part of the wing preserved appears superficially 

 dark fuscous all over (except the stigma), the cells (especially in the 

 region below the stigma) have more or less hyaline centers, giving the 

 wing a spotted effect under a lens. This is not true of the modern 

 Agrion, but may be observed in Pseudophaea. 



Type. — U.S.G.S., 888, Green River, Wyoming. (Scudder collection.) 



Holotype.— Cat. No. 66549, U.S.N.M. 



PROTAMPHIPTERYX, new genus. 



Antenodal cross-veins six, of which only the first two (which are 

 heavier than the others) cross the subcostal space; arculus remarkably 

 basad, midway between first and second antenodals; postnodals very 

 numerous, 21 visible in specimen, separating cells which are mostly 

 not much broader than high; postnodals not meeting the cross-veins 

 of the series below; subnodus extremely oblique, in a line with lower 

 part of nodus; Mg separating from Mj+j half v.'ay between level 

 of second and third antenodals; Mj leaving Mj far beyond nodus, 

 at level of middle of seventh postnodal cell; doubling of cells be- 

 tween Ml and Mj beginning at level of twelfth postnodal cell; a 

 short distance beyond level of nodus, Mg is conspicuously nearer to 



