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BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



" It may be noted that R. indentata does not appear to have been 

 collected west of the Eocky Mountains." 



I am indebted for the accompanying drawing (Fig. 7) of this species 

 to Mr. A. F. Gray, of Danversport, Mass. 



The following species of harvestaian is described, as either this or an 



allied form may be found to occur in caves in the Rocky Mountains : — 



Scoiolemon rohustum, n. sp., 8 5 .^(Fig. 8. — a, maxilla ; 6, c, mandible, 



all enlarged). — Tegument deep-reddish, with the hinder segments 



finely bordered with brown ; tarsal 

 joints paler, with dense blackish 

 specks; cephalothorax a little paler 

 red, marbled with reticulated darker 

 lines. Body pyriform, two-thirds as 

 long as broad ; cephalothorax a little 

 more than half as long as wide, the 

 front edge slightly rounded, with the 

 angles well marked. The eye-tuber- 

 cle not so large and high as in >S^. ter- 

 ricola Simon, being of moderate size. 

 Eyes black and large, fully developed, 

 while those of 8. terricola are nearly 

 obsolete. Abdomen a little longer 

 than broad ; the first five segments 

 Fig. s.—Scotoiemo7i robustum, Pack., n. sp. (en- well marked, the suturcs being much 

 " ' more distinct than in S. terricola, or 



probably any other European species, judging by Simon's drawings. 

 The last three segments, with the outer edge of each segment, free, 

 not united with each other, as are the five basal joints ; last segment 

 with the ventral slightly projecting beyond the tergal portion. Beneath 

 are seven well-marked sterna, the first and second being united without 

 suture. 



Mandibles of the usual form, rather stout at base of first joint, but 

 much as in S. terricola ; second joint moderately long ; hand of the usual 

 form, a little unequal. Maxillse unusually short and thick, much more 

 so than in 8. terricola or any other species described by Simon ; basal 

 joint broader than long, with a pair of stout, sharp spines and four small 

 ones 5 second joint nearly two-thirds as broad as long, full and swollen 

 above, beneath with four large spines ; third joint much slenderer, one- 

 half as long as the second ; fourth joint nearly twice as long as broad, 

 with five stout spines, of which the fourth is much larger than the oth- 

 ers, the fifth minute. Fifth joint as long as, but slenderer than, the 

 fourth, with five stout spines, the fifth and terminal spine much larger 

 than the others, and as long as the joint is wide. This joint is a little 

 hairy, while the others are nearly naked. 



Legs stout, much more so than usual in the genus ; anterior pair 

 with three tubercles ending in hairs on the second joint; a larger tuber- 



