NEUROPTERA— PLANIPENNIA— SIALINA. 159 



mined, or as far as it is preserved. The front wing is long and rather 

 slender, slightl}- enlarging apically, so as to l)e broadest at the inner half 

 of the pterostigma, the apex well rounded, the costal margin straight, at 

 base broken so that one may not say whether the wings were here expanded 

 or not. The veins of the front wing are black, of the hind wings blackish 

 brown. The pterostigma of the front wings is of moderate size, very dark 

 fuliginous, its proximal margin transverse, its distal very oblique ; except- 

 ing its tapering apical portion, it is nearly equal in breadth or slightly enlarg- 

 ing in the middle and about twice as long as broad ; the figure is here not 

 quite correct. The subcostal vein is straight and strikes the costa at a 

 little more than the pterostigma's distance before the latter; the space 

 between it and the oosta is broken by oblique cross-veins, of which only 

 one remains near the middle of the wing. The radius runs close to the 

 subcostal vein, and is connected with it by a single transverse vein at the 

 middle of the wing. Beyond the basal cell, which is bisected obliquely by 

 the last sectQi", there are, just below the radius, three moderately long pen- 

 tagonal cells, the second reaching nearly to the middle of the pterostigma. 

 Omitting the marginal cells, there are six radiating series of cells between 

 the pterostigma and the anal vein ; the cubital cells are large and broad, 

 being not more than twice as broad as long, while all the other large cells 

 of the wing are exceedingly long and slender, often several times longer 

 than broad, scarcely, if at all, broader in the middle than at the ends, the 

 transverse veins being comparatively few ; the terminal veinlets of the 

 apical half of the lower border are simply and widely forked. 



In the hind wings, the lower half only of which is preserved, all the 

 terminal veinlets appear to be forked, and excepting at the upper part of 

 the apex, the sectors, which are broadly sinuous, appear to be very rarely 

 connected by transverse veinlets even near the border; at least almost none 

 can be detected. 



Length of body, 11.8'"™ ; of head, 1.8°"" ; breadth of same, 1'"™ ; length 

 of prothorax, 1.6°""; l)readth of same, 0.35'""; breadtli of thorax, 1.7""'"; 

 length of abdomen, 5.75'"™ ; breadth of same, 0.85°"" ; length of fore wing, 

 9'°'" ; its l)readth, 2.7'"°'. 



Florissant. One specimen, Nos. 956 and 4330 (<^). 



