170 TEETIAKY INSECTS OF NOKTII AMERICA. 



1. Tribochrysa vetuscula. 



PI. 14, Fig. 9. 



The stone on which the single specimen referred here occurs has 

 unfortunately been broken across the wings, and the apical half is lost ; 

 otherwise the specimen would be nearly perfect, the head, thorax, eyes, 

 and antennae being well preserved. The antennae are unusually short, 

 being a little shorter than the body and more tapering than usual in this 

 family. The head is well rounded, the eyes neither very large nor promi- 

 nent, the prothorax tapering a little anteriorly, the sides a little arcuate, 

 the front slightly concave. 



Only the basal half of the w'ngs being preserved, little can be said of 

 them, but the costal margin and area are much as in T. fii-mata, and the 

 neuration is so peculiar as to separate the species readily from the others ; 

 there are about a dozen transverse veins in the costal area ; the transverse 

 veins uniting the radius and its sector are rather more numerous than in 

 the other species of the genus ; the cross-vein uniting at base the sector 

 and the first cubital vein strikes the latter so as to form a continuation of 

 the vein closing basally the double cubital cell ; the upjier of these two 

 cells is scarcely smaller than the lower ; the upper cubital vein arises 

 directly from the radius without the support of a basal cross-vein ; and the 

 proximal cells between the sector of the radius and the upper cubital vein 

 are, excepting the first (which is of irregular shape), not so disproportion- 

 ately large as in the other species, being less than half as broad again as 

 long, about as long as the subradial cells, and only a little oblique, differ- 

 ing in all these respects from both the other species. 



Length of body (estimated), 12°"° ; of head and thorax, 4.5"°' ; 

 antennae, 11™"; length of wings as preserved, 9.5°"°; probable full length, 

 14"" ; presumed breadth, 4.5"". 



Florissant. One specimen, No. 11204. 



2. Tribochrysa inequalis. 



Tribochrysa inequalis Soiidd., Zittel, Handb. d. Pala^ont., I, ii, 777, Fig. 982 (1885), 



The single specimen referred here has all the wings superimposed on 

 one another, but in addition a portion of the slender antennae and the large 

 globular eyes can be seen, with faint traces of the head, thorax, and abdomen. 



