196 TERTIARY INSECTS OP NORTH AMERICA. 



It is not, however, as in Europe, the only subfamily represented in the 

 strata, three others being also represented and one of them nnich more 

 largely. (February, 1884.) 



NEURONIA Leach. 



A single small species of this genus has been described from amber by 

 Pictet and Hagen, which the latter compares with the living N. reticulata. 

 The one here described is the first known from the rocks, and is a consider- 

 ably larger species, and with somewhat peculiar neuration. The genus is 

 well represented at the present time over all North America, and besides is 

 found only in Europe. 



Neuron I A evanescens. 



PI. 13, Fig. 3. 



A single specimen of a large species of plu-yganid is referred to Neu- 

 ronia, although the neuration appears to be somewhat abnormal, the cross 

 neuration on either side of the sector not being continuous. The insect is 

 preserved on a lateral view, showing the head ;.nd body, the superposed 

 wings of one side, and all but the base of the other front wing extended be- 

 low the body, together with one hind leg. 



The upper half of the overlapjnng wings is much darker than the lower 

 half and shows some mottling near the tip, whicli is not tlie case in the other 

 wing. The single front wing is of a uniform brownish fuliginous tint, but 

 broadly obscured in the middle of the wing by accident of preservation over 

 a large pale area, in which also the veins are nearly lost. This accounts for 

 the inaccui'acy of the drawing on the plate. 



The front wings ai-e subtriangular, less than two and one-half times 

 longer than broad, their greatest breadth in the middle of the apical half; the 

 costal margin is gently arched in the apical half, the apex roundly pointed, 

 the apical margin almost straight in the middle half and inclined at a raiher 

 sharp angle with the costal margin. 



The shape of the wings, as well as the brevity of the discal cell, renders 

 it probable that the species should be referred to Neuronia rather than to 

 Phryganea or Agrypnia, though it is impossible to determine clearly whether 

 there is a cross-vein between the subcostal vein and the costa. The radius 

 has a broad superior arch below the extremity of the subcostal which renders 

 it probable that it exists, and that it can not therefore be referred to Agryp- 



