468 Mr. T. D. A. Cockerell on Fossil Arthropods 
wings about 6°4 mm. long and entirely dark fuliginous. 
Venation as shown in figure. 
In. 17098 (A’Court Smith). 
Bibio vblitus, sp.n. (Fig. 29.) 
Wing 4 mm. long; hyaline, with the stigma very dark, 
and apical region smoky but not dark; stigma and third 
Fig. 29. 
Bibio oblitus, sp. n. 
vein fuscous, quite dark, but veins of middle and lower part 
of wing colourless and very slender. Allied to B. gurnetensis, 
Ckll., but smaller, and differing in the details of the 
venation. 
I. 9604 (Brodie collection). 
Bibio extremus, sp. u. (Fig. 30.) 
Wing 5 mm. long, hyaline; stigmatic spot large; 
venation similar to that of B. obscuripennis, Meij., except 
Fig. 30. 
Ripe nr 
Bibio extremus, sp. n. 
that the discal cross-vein is conspicuously shorter. Also 
related to B. oligocenus, Ckll., but much smaller, and 
differing in the details of the venation. 
I. 8860 (Brodie collection ). 
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