572 OPILIONES. 
[RHAUCUS. 
Rhaucus, Simon, Ann. Soc. Ent. Belg: xxii. p. 213 (1879). 
Type 2. vulneratus, Simon. Brazil. 
Tarsal segments, i. 6, 1 and 2 inflated ; ii. 12; iii. and iv. 9.] 
[COSMETUS. 
Cosmetus, Perty, Del. Anim. Art. Bras. p. 201 (1833). 
Type (left in by elimination of species removed to other genera) C. varius, Perty. Brazil. 
Tarsal segments, i. 10; ii. —?; iii. 13; iv. 15.] 
[METARHAUCUS, gen. nov. 
1. Metarhaucus fuscus, sp. n. 
Type, ¢, in coll. Keyserling, in Mus. Brit. Total length 8 millim. 
Eye-tumulus nearly three times longer, transversely, than broad, depressed in the middle, tuberculous at the 
sides above the eyes. Segments 1 and 2 of the dorsal scutum indicated by two deep grooves, their discs 
armed with small tubercles, that of the first with a pair of larger tubercles ; segment 3 with a pair of 
large, low, tuberculous cones; segments 4 and 5 set with tubercles, the four free segments also set with 
tubercles. Coxa iv. with two tuberculous bosses on the outer side. The whole body covered with minute, 
widely scattered tubercles. Femur and tibia ii. armed beneath with a series of denticles ; femur iv. 
studded with tubercles above and two series of denticles beneath; tibia iv. similarly armed, but not so 
much developed. Tarsal segments, i. 6, 1-3 inflated; ii. 12; ii. 9; iv. 10. 
Hab. Couomsia. | 
[NEORHAUCUS, gen. nov. 
1. Neorhaucus aurolineatus, sp. n. 
Type, ¢, in coll. Keyserling. in Mus. Brit. Total length 12 millim. 
Very similar in general structure to Metarhaucus fuscus, but with the pair of tubercles on segment 3 of the 
dorsal scutum much smaller; there is also a pair of small central tubercles on segments 1 and 2. The 
five segments of the dorsal scutum are divided by transverse orange-coloured grooves, with also a similar 
groove separating the prosoma from the first opisthosomatic segment. The whole body is armed with 
tubercles. Femora and tibie iii. and iv. similar to those of M. fuscus, except that the tubercles and 
denticles are more strongly developed. Tarsal segments, i. 5, 1 and 2 inflated ; ii. 14; iii. 8; iv. 9. 
Hab. CoLomsia. | 
[PARARHAUCUS, gen. nov. 
1. Pararhaucus obscurus, sp. n. 
Type, d, incoll. Keyserling, in Mus. Brit. Total length 7 millim. 
Similar in general structure and appearance to Metarhaucus fuscus and Neorhaucus aurolineatus, the opistho- 
somatic dorsal segments being also divided by five yellow transverse grooves. Femora and tibia iii. 
and iv. also similar, but the tubercles and denticles are less developed. Tarsal segments, i. 7, 1-4 
inflated; ii. 18; iii. 9; iv. 9. 
Hab. CoLomsia. | 
