42 Bulletin Wisconsin Xatural History Society. [Vol. 6, Xos. 1 — 2. 
The six species of Chelanops now known from Texas may be 
separated by the following: table : 
1. Many hairs on palpi distinctly clavate 2 
Hairs on palpi not plainly clavate 4 
2. Fingers equal to hand, which is not very large, small species 
unicolor 
Fingers shorter than hand 3 
3. Hand very heavy, nearly tvsrice as wide as tibia? tumimanus 
Hand not heavy, but little wider than the tibia texanus 
4. Fingers plainly paler than the hand, small species pulchellus 
Fingers as dark as hand, larger species 5 
5. Fingers shorter than hand oblongus 
Fingers as long as hand sequalis 
Ideobisium rufulum Banks. 
From nest of Carnponotus sansabcanns, Austin. 
Olpium minutum n. sp. 
Cephalothorax pale yellowish brown, darker in front, palpi yellow- 
ish brown, the fingers the darkest ; abdominal scutae yellowish, legs 
and venter whitish. Cephalothorax one and a-half times longer than 
broad, hind border rounded, but little narrowed in front, two distinct 
eyes each side close together. Palpi short ; femur about as long as 
width of cephalothorax, a trifle wider at tip than near base, tibia nearly 
as long as femur and one and one-fourth times wider, the greatest 
inner convexity at middle, hand fully as long as tibia, one and one- 
fourth wider, sides but little convex ; fingers stout, much shorter than 
the hand ; hairs of palpi fine and uneven. Abdomen three and one-half 
times as long as wide, each scivtum with 3 or 4 very fine hairs on. 
posterior margin. Legs very short, hind femora slightlj^ SAVollen, tarsi 
very short. Length 1.6 mm. 
In nest of Be it on ccccum, Austin. Texas. Differs from O. 
obsurum in paler color, smaller size, longer abdomen, and more 
slender cephalothorax. 
