174 THE ENTOMOLOGIST. 
Wings mainly clear, but with the costal region broadly fuliginous, 
this narrowing toward the apex, but including the whole of the third 
vein; veins thick, dark reddish-brown. In venation this agrees with 
Bibio as figured by Williston (N. A. Dipt. p. 142, f. 4), except that 
the basal section of the third vein (from anterior cross-vein to first 
vein) is shorter, and the cross-vein between the fourth and fifth is a 
trifle longer. The hind femora are slender, and only about 2 mm. long. 
The male, as in modern species, has swollen anterior femora. 
In this sex the dark colour of the wings appears to be redder and 
more suffused. 
This is a perfectly typical Bibio, such as may be caught in 
Colorado to-day, even to the structure of the anterior legs in the 
male. 
Hab. Miocene shales of Florissant, very abundant. The 
Bibionide from earlier American Tertiaries belong to the less 
specialized genus Plecia. I learn from Prof. Melander that a 
yellowish Plecia was collected in the Florissant shales by 
Scudder. 
Bibio dubius, Bellardi, is later than the fossil B. dubius 
(Germar) Giebel, but as the latter was originally described (in 
1837) under Phthiria, and is doubtfully a Bibio, the name of the 
Mexican species can probably remain. 
Bibio gracilis, Walker, List Dipt. Brit. Mus. 1848, p. 123 
(Canada and N.H.) is a homonym of B. gracilis, Unger, 1841. 
Walker’s species may be called Bibio slossone, n.n., having been 
added to the United States fauna by Mrs. A. T. Slosson. 
ON TWO UNDESCRIBED SPECIES OF SCOLUDH 
FROM BORNEO. 
By P. Cameron. 
Discolia ornaticollis, sp.nov. 
Black, the prothorax and scutellum rufous, the pro- and meso- 
notum covered with stiff, depressed, red hair ; the scutellum and base 
of metanotum more sparsely with longer paler reddish hair, the hair 
on the head, pleure, apex of metanotum, abdomen, and legs white ; 
the clypeus, except for a large black mark on the apical half and the 
mandibles, except at the apex, pale yellow. Abdomen distinctly 
bluish violaceous. Wings uniformly fuscous violaceous, the neryures 
black. g. Length, 8 mm. 
Kuching, Borneo (John Hewitt, B.A.). 
Front and vertex smooth ; the metanotum in the centre strongly 
but not closely punctured; the sides are neither so strongly nor so 
closely punctured. Except for a black spot on the sides near the 
apex ie prothorax is red. Apical abscissa of radius broadly roundly 
curved. 
A distinct little species. 
