74 T. D. A. Cocherell — Descriptions of Tertiary Insects. 



tinct brace-vein. The figured specimen is in Peabody Museum, 



V ale. 



Hoplona-schna separata (Scudder). 



Two specimens, representing the hind wing, were obtained 

 at Station 14, one by my wife, the other by myself. Scudder's 

 type, an anterior wing, was referred to Basiceschna ; but 

 Needham expressed the opinion that it belonged to Hoplonce- 

 schna (Pr. U. S. Nat. Mus., xxvi, p. 761). The new specimens 

 are far from perfect, but they show that the hind wing has 

 the following characters: 



(1) Triangle with a double ceil at base, and then four simple 



cells, varying to a double and three simple cells. 



(2) Anal triangle of three cells. 



(3) M 4 , after running parallel with M„ separated by a single 



row of cells, is suddenly bent downwards, and is separ- 

 ated by two and three rows of cells ; a character of 

 Hoplonmschna. 



In my table in Bull. Amer. Mus. Nat. Hist., xxiii, pp. 133, 

 134. the insect runs to Basiceschna \ but the anal triangle 

 agrees with Hoyloncesclina^ and not so well with Basiceschna. 

 On the other hand, as to the stigma H. separata is like 

 Basiceschna, not like Iloplonceschna. The region about the 

 triangle agrees almost exactly with Gynacantha. 



The number of cells in the triangle is variable in JEscknids. 

 Mr. Williamson, to illustrate this point, has very kindly sent 

 statistics of three very closely allied forms of uiEschna, based 

 on males. In order to make them clear, [ have constructed 

 cell formulae, enumerating the cells in order, beginning from 

 the base. Thus 2, 1, 1, means a double cell and then two sim- 

 ple ones; 1, 1, 1, three cells, all simple. 



Front Wing. 



1, 1, 1, . . Indiana species (2 specimens). 



2, 1, 1, . . Multicolor (seven). 



2, 1, 1, 1, Multicolor (eleven), Indiana sp. (18), Jalapa sp. (7). 

 2, 2, 1, 1, Multicolor (two), Jalapa sp. (1). 



Hind Wing. 



2, 1, ... . Multicolor (one). 



2, 1, 1, . . Multicolor (17), Jalapa sp. (4), Indiana sp. (2). 



2, 1, 1, 1, Multicolor (two), Jalapa sp. (4), Indiana sp. (18). 



The number of cells in the anal triangle Mr. Williamson 

 states is also not of generic importance. He adds : " The kink 

 in M 4 is a character generally associated with the curving 



