NEUROrTBRA— ODONATA— .ESCHNINA. 143 



1. Subgenus ^schna Selys. 



This group of the genus ^Eschua is a cosmopolitan one, and includes 

 a larger proportion of the species than any other. I'o it belong two 

 European and one American fossil species, all closely allied, but the 

 European more nearly related to an existing European species, JE. mixta, 

 the American to an existing American species, ^E. constricta, than to any 

 others. 



^SCHNA (^SCHNA) SOLIDA, 

 PI. 13, Fig. 1. 



A remarkably well preserved front wing, the extreme base only lost 

 Wing of rather small size and rather slender, the middle line of the basal 

 half bent at a slight angle with that of the apical half; tip of the wing uni- 

 formly rounded ; nodulus above the principal sector strongly and rather 

 regularly curved, much nearer the pterostigma than the base ; nodal sector 

 curved rather gently upward in the middle portion of its course but termi- 

 nating some distance below the apex of the wing ; subnodal sector forked 

 widely a little before the pterostigma, the upper fork turning abruptly 

 upward at its origin ; the intercalated sector between the subnodal and 

 median forked below the base of the pterostigma, its upper fork also curved 

 upward and separated at tip from the lower fork of the subnodal by only a 

 single row of cells, as usual ; median and short sectors separated in the 

 apical half (or less) by a double row of cells in the discoidal field below the 

 triangle, first two, then three, and afterwards four or five rows of cells irreg- 

 ularly disposed. Pterostigma scarcely four times as long as broad, the 

 inner and outer margins very oblique and parallel ; color blackish castane- 

 ous, the bordering veins black. Antecubitals more than twenty-two (prob- 

 ably about twenty-five), postcubitals fifteen. 



Length of wing more than 4 1""" (probably 44""°); breadth, 10.5""°; dis 

 tance from nodulus to base of pterostigma, 15""° ; length of pterostigma, 4""°. 



This species plainly belongs to the subgenus ^Eschna. By favor of 

 Dr. Hagen I have compared it directly with all the species referred by 

 Selys to that group, excepting a couple of rare forms, and unquestionably 

 it is most closely allied to JE. constricta, though closely resembling JE. 

 mai'chali. Indeed, the resemblance to JE. constricta is closer than I have 

 yet found between any well preserved Florissant insect and any living 



