NEUROPTEliA TltlCIiOI'TEKA HYDi;n|'.s\( IMD.I.;. 



in the middle of the wing, the costal margin lulling obliquely to tin; tip 

 over a considerable area, and the apical margin t-ijiiallv oblique below tin- 

 apex; the contrast in the length of the first and .M-C. md apical cells i~ verj 

 marked: the cross-vein uniting the sector and rnbitiis falls at tin- origin ot' 

 the second apical cell, and the median and discoidal cells originate >ide by 

 side; none of the cross-veins are shown in the plate The \\-ing is cle.-n-. 

 excepting for a slight Infuscation along the costal e<l--,- .md the infnscation 

 of the veins. 



I,, n-th of body, 10 mm ; of front wings, 10"""; breadth of same, 3.35 mm ; 

 length of fore femora, I.?"""; tibia:-, 1.7""". 



Florissant. One specimen, No. 14'JIU. 



f>. LEPTOBROCHUS gen. nov. (\eirros, Ppfyo?). 



This genus, which includes only one species, is remarkable for lacking 

 not only the fifth, but. the second, apical cell. In other iv>pe,-H it does not 

 differ from Derobrochus, except in having, as in Litobrochus, an extremely 

 long median cell, due, however, not to the extension of the cell toward the 

 margin, but to its basal extension by the earlier origin of the middle branch 

 of the upper cubital vein. 



LEPTOBKoflirs I. TIKI'S. 



PI. 15, !'(;:* 1, 3. 



This abundant species is rarely well preserved. It has a slender body. 

 long and narrow wings, very slender legs, and antenna- longer, so tar as 



known, than any other of our fossil species, beini: much i v than twice 



the length of the body (including the closed wings); the joints an- about 

 four times longer than broad, very slender, and the incisnre> marked with 

 fuscous; the first joint is stout and obovate. The front win^- an- ver\ 

 loii^- and slender, the apex produced, suliaciiminate and BCarcelj above the 

 middle: the first apical cell is tolerablv small, and the di>coidal cell 'appar- 

 ently open; the median cell, however, is clo>.-d, and the cell itself exceed- 

 ingly long, the cloMire being a littli- before the origin of the third apical 

 cell, which is not quite so long as the breadth of the wing and shorter than 

 the fourth apical cell ; these features of the iieuration do not appear in the 

 figures on the plate. 



