260 ME. C. J. WITH ON SOUTH-AMEEICAN CHELIPEEIN^ 



17. Chelifer subeobustds Balz. (Plate XXX. figs. 12 a-l.) 

 1891. Atemnus sulrobustus Balzan, (ii) pp. 512-513, pi. 9, figs. 3-3 a. 



Ceplialothorax. — The cephalothorax, which is about as long as wide, has no 

 transverse grooves, and is minutely, not very distinctly granular. 



Abdomen. — The hairs are moderately long, pointed or obtuse. 



Antennce. — The terminal hair extends slightly beyond the rather short and clumsy 

 galea, which is exactly like Balzan's figure 3 a and with six short branches. 



Paljys (PL XXX. figs. 12 a-h). — The maxillce are smooth. The palps are 

 minutely granular, with the exception of the almost smooth chela ; the dorsal and 

 lateral surfaces of the trochanter and femur are fairly distinctly granular, while the 

 lower surfaces and the tibia are less distinctly so. The hairs seem to be rather short 

 and slightly obtuse. The trochanter, which is about 1'5 as long as wide, is anteriorly 

 strongly convex and posteriorly produced into a rounded protuberance ; the low 

 dorsal tubercle is somewhat conical. Ihe femur has a very short and well-defined 

 stalk, beyond which it is somewhat attenuated. It is about 2-1 as long as wide ; the 

 anterior outline is slightly convex and then concave, while the posterior is abruptly 

 raised and then almost straight. The tibia, which has a very short and well-defined 

 stalk, is longer and wider than the femur and scarcely twice as long as broad ; 

 anteriorly it is distinctly convex and then a trifle concave, while the posterior outline, 

 beyond the well-marked basal elevation, which is separated by a deep notch from the 

 prominent condylus, is first almost straight and then moderately convex or obtuse- 

 angled. The chela, which is about 3 as long as wide, is 1*1 broader than the 

 trochanter is long ; the hand, which is 1*1 as long as, but 1"3 wider than, the tibia, 

 is almost 1'8 as long as wide, 1'3 broader than deep, and about 1'4 as long as the 

 fingers, which are much (1'3) longer than the hand is wide and gape a trifle when 

 closed ; the hand beyond the stalk is very abruptly raised posteriorly, but anteriorly, 

 as well as dorsally and ventrally, more gradually convex, and then almost straight 

 (c/. Balzan's good figure 3 of palps, pi. 9). Anteriorly no accessory teeth were observed, 

 but posteriorly about 15 in both fingers (figs. 12 a-h). The immovable finger bears 

 anteriorly about eight " spots " arranged as figured and posteriorly a similar number, 

 while the movable finger has none. 



Coxas. — The second and third pair are longer and more slender than those of 

 Ch. suhgracilis, sp. n., but less so than those of Ch. rudis Balz. The fourth pair are 

 somewhat triangular, as the inner somewhat shorter margin merges into the hinder 

 and as they are widened out towards the extremity. 



Legs. — Only the femur of the fourth pair distinctly granular, the other joints 

 smooth or indistinctly so. The hairs of the dorsal side of the legs are short, obtuse, 

 and with a few teeth, while those of the ventral side are long, pointed, and more or less 

 simple. A median tarsal " tactile " hair seems to be present. The legs are rather short 

 and clumsy ; the trochantin of the first pair is deeper than the tibial part and the 



