222 MK. C. J. AVITH ON SOUTH-AMERICAN CHELIFERIN.E 



blunt anteriorly, but backwards and upwards produced into a fairly acute stylet ; 

 the whole structure appears, in the median segments at least, similar to a hatchet ; the 

 keel of the ninth segment is only slightly developed and that of the tenth just indi- 

 cated (fig. 1 a). Skin ever) where distinctly granular. Tergites bear in a row along 

 the hindmost margin from 12-14 clavate hairs in addition to a single lateral hair in 

 front of the row, which together with the outermost of the row is placed on the lateral 

 keel ; the second to the tenth tergites bear also a median hair in front of the row on 

 each side, as well as a single hair between the two mentioned, with the exception of 

 the second and third segments. The eleventh tergite bears in addition to eight hairs, 

 placed in two rows, about 100 small round spots, perhaps seats for minute fissures, and 

 so does the corresponding sternite. 



Antenna?. — The terminal hair extends distinctly beyond the slender cylindrical ^a/^a, 

 which possesses two almost obsolete teeth just beyond the middle and three more 

 developed terminally. 



Pallas (PI. XXIX. figs. 1 c-d). — The maxilla; are granular all over. Trochanter and 

 femur of palps are distinctly granular, the latter joint less distinctly so ventrally ; the 

 two following segments only slightly granular, except in front laterally ; in addition to 

 the usual granulations the trochanter bears posteriorly some more rounded small 

 tubercles as well as about five larger conical eminences ; on (he anterior surface of the 

 femur about 25 triangularly shaped tubercles are observed, while the tibia shows traces 

 onlv of similar structures. Hairs are short ; those of trochanter as well as of anterior 

 surface of femur and in a less degree of tibia are slightly clavate, while others are 

 more or less obtuse except pointed ones of fingers ; the tubercles just mentioned 

 always possess a single hair. The irochanter, which has a long and very well-defined 

 stalk, is 2"3 as long as wide ; it is wider than femur or tibia and twice as long as chela is 

 wide ; the anterior outline beyond the stalk is slightly convex and then almost straight, 

 Avhile the posterior is produced just beyond the stalk and then distally becomes a little 

 concave. The femur, which has a short, well-pronounced stalk, beyond which it is 

 gradually, but most distinctly, widened out towards the extremity, is 8-5 as long as wide; 

 anteriorly, beyond the stalk and a short basal elevation, marked otf from each other by 

 a low notch, it is slightly concave, while posteriorly beyond the stalk it is slightly 

 convex, and then straight, or even a trifie concave. The tibia, which is distinctly 

 shorter and a little wider than the femur, has a short fairly well-defined stalk and is 

 gradually and distinctly widened out towards the tip ; it is almost eight times as long 

 as wide terminally ; the outline beyond the rather shallow notch of stalk is almost 

 straight and then a trifle concave anteriorly, but posteriorly beyond the small condylus 

 and the elongated badly defined basal elevation it is moderately concave and then convex 

 but for a slight concavity terminally. The chela is seven times as long as wide ; the 

 Jiand, which is much shorter than the tibia and 1'4 as wnde, is 4'2 as long as wide, as 

 wide as deep, and 1"5 as long as the finger. The fingers gape very distinctly when 



