. Bulletin - American Museum of Natural History. Natural history; Science. (118) Article XXX. âFOSSIL SAW-FLIES FROM FLORISSANT, COLORADO. By T. D. A. COCKERELL. Dineura saxorum sp. nov. Length about 7 mm.; width of abdomen 2 mm.; anterior wing about 6 | mm.; wings hyahne, nervures fuscous; the head and thorax were apparently black; abdomen brown, with hght bands on the first five segments, those on the second, third, and fourth more or less interrupted in the middle; the apical segments appear to have lateral spots. The venation agrees well with Dineura (cf. Macgillivray, Pr. U.
. Bulletin - American Museum of Natural History. Natural history; Science. (118) Article XXX. âFOSSIL SAW-FLIES FROM FLORISSANT, COLORADO. By T. D. A. COCKERELL. Dineura saxorum sp. nov. Length about 7 mm.; width of abdomen 2 mm.; anterior wing about 6 | mm.; wings hyahne, nervures fuscous; the head and thorax were apparently black; abdomen brown, with hght bands on the first five segments, those on the second, third, and fourth more or less interrupted in the middle; the apical segments appear to have lateral spots. The venation agrees well with Dineura (cf. Macgillivray, Pr. U. S. Nat. Mus., XXIX, pi. xxxiii, fig. 63), but unfortunately, although the wings are for the most part well pre- served, the basal region is obscure, so that it is impossible to be absolutely sure about the form of the lanceolate cell. After very close scrutiny, how- ever, I believe it is certainly petio- late, as in Dinetira, not contracted in the middle and double as in iffw- yi^.-l. Dhu;<,a . ^vr^oy. ichroa. The venation agrees with Macgillivray's figure of Dineura geeri, dift'ering only in slight details, as follows: Anterior wing. â (i) Transverse costal nervure (Sci) a considerable distance basad of the insertion of the basal nervure, about as in Pteronus; (2) transversomedial nervure attached decidedly nearer base than apex of first discoidal cell, a character approached by Pseudodineura; (3) first discoidal cell longer, its base being more produced; (4) upper edge of second discoidal cell longer, as must follow from the shifting of the transversomedial nervure. Hind wing. â â- (5) Nervure M2 inserted a short distance basad of origin of R4. (This character exists, much exaggerated, in Hemickroa.) The following measurements are in /<: Breadth of marginal cell ....... 600. Length of first submarginal cell . . . .360. " " second " " on marginal .... 930- " " third " I. .. .< .... 750. Insertion of second recurrent nervur
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