NKUKOPTERA PLANIPENNIA-SIALINA. 155 



The wings are considerably longer than the abdomen, oval, rounded 

 at the tip, with a gently convex inner margin and a nearly straight costal 

 margin. The neuration is distinct and black and in the front wings as fol- 

 lows : The pterostigma is small, semi-oval, fuliginous, deepening centrally, 

 situated in the middle of the apical half of the wing at the costal margin, 

 cut-obliquely by a curving transverse veinlet at its outer extremity. The 

 costal margin is scarcely expanded at the base, and the costal vein is ex- 

 ceedingly short, terminating in the margin before the end of the basal third 

 of the wing ; this feature, with others in the neuration and the total absence 

 (as far as can be seen) of costal transverse veinlets, renders it doubtful 

 whether it belongs to Raphidia in a strict sense. The subcostal vein 

 therefore forms a considerable part of the costal border and is widely sep- 

 arated from the radius and connected with it by a single transverse veinlet 

 in the middle of the wing. The sectors do not arise obliquely from the 

 radius, but are connected with it by straight transverse cross-veins, making 

 two long and large pentagonal cells in the middle of the wing beneath the 

 radius, equally broad at both ends. There are three long discoidal areolets, 

 the uppermost narrow, the middle one shorter than the others, the outer 

 limits of all of them nearer to the apical margin than to the inner limits, 

 making the marginal areoles shorter than the discoidal ; all the areolets of 

 the central portions of the wing are large, being few in number, and they 

 approach rather near the margin, with which they are connected by few, 

 seldom and then simply furcate, marginal veinlets. 



Length of thorax, 1.85 mm ; of abdomen, 5.2 mm ; of wing, 7.75 mm ; breadth 

 of latter, 2.55 mm . 



Florissant. One specimen, No. 4383 (<?). 



2. INOCELLIA Schneider. 



The occurrence of a species of this genus in amber and its present 

 existence only in the north temperate region of the Old World and of our 

 extreme western coast, where the affinities of the fauna are decidedly E-uro- 

 pean, render the discovery of four species in our Colorado Tertiaries one of 

 special interest. It is curious, however, that they differ not only from the 

 modern forms, but also from the amber species, I. erigena Menge, in lacking 

 the regular arrangement of the cells below the pterostigma to form a trans- 

 verse uniform series of discoidal areolos. 



