212 
femora, 2.25 mm.; tibiz, 2.5 mm. ; tarsi, 2.4 mm.; hind femora, 
3.2)mm. 5 tibic, 3:1mm. 5, tarsi, 2.25 Po amm. 
Florissant, Colorado. Three specimens, Nos. 8161, 8846 and 
8871 of my collection; No. 1.748 of the Princeton collection. 
Gonompyia frigida. 
Ply 4, hes: 
Wings hyaline without spots or stigma, the veins fuscous. Aux- 
iliary vein terminating a little beyond the middle of the wing, and 
not far from midway between the origin of the second and third 
longitudinal veins, the subcostal cross vein shortly before its tip 
and midway between it and the base of the preefurca. First longi- 
tudinal vein ending about opposite the distal extremity of the discal 
cell. Przefurca arising somewhat before the middle of the wing, 
strongly arcuate at base, thereafter subparallel to the first longi- 
tudinal vein, the strongly oblique upper branch of the second aris- 
ing opposite the tip of the first longitudinal vein, the first sub- 
marginal cell about as long as its petiole. Second submarginal 
considerably longer than the first posterior cell. Discal cell small, 
equal, considerably shorter than the posterior cells beyond it, the 
great cross vein striking it close to its base. The femora are gradu- 
ally though very slightly thickened and darkened apically. 
Length of wings, 5.5-5.75 mm.; fore femora, 2.8 mm. ; tibiz, 
3mm.; tarsi, 3 mm.; mid femora, 3 mm.; tibiz, 2.75 mm. ; 
tarsi, 2.75 mi.; hind femora, 3:5 mm..; tibiz, 3) mm.5)tarer 
3.25 mm. 
Florissant, Colorado. ‘Three specimens, Nos. 3434, 6034, 8656. 
CLADONEURA (xAddos, vevpd) gen. nov. 
Among the species which in my preliminary survey of these 
fossils I had grouped under Cladura, is one which agrees with 
modern forms of that genus in one particular, namely, the distance 
between the base of the prefurca and the tip of the auxiliary vein, 
which more than equals the breadth of the wing ; while in the fossil 
species of Cladura described below the distance is less, sometimes 
much less, than the breadth. It further agrees better with the 
modern than with the fossil species of Cladura in that the tip of 
the auxiliary vein extends a little beyond the base of the first sub- 
marginal cell; and in that the petiole of this cell about equals the 
