478 BULLETIN UNITED STATES GEOLOGICAL SURVEY, 



T. elongata Walck. — Space between the two lateral eyes smaller than 

 tliat between the posterior central and lateral eyes, smaller, or at least 

 not larger, than the space between the anterior and posterior central 

 eyes. Length of mandibles of male about nine-tenths of the length of 

 cephalothorax, armed above, toward the extremity, with only a strong 

 tapering spine, emarginated at the truncated apex; the anterior margin 

 of the claw-furrow is provided with at least 8 teeth ; first tooth small; 

 second larger, directed somewhat backward ; third very long and 

 strong; the distance between first and second larger than (in general^ 

 about double as large as) that between second and third, and rather 

 larger than the space between third and fourth, which is at least double 

 as large as that between fourth and fifth ; the posterior margin has also 

 about 8 teeth; first small; second rather long and strong; the follow- 

 ing smaller; the distance between first and second smaller than that 

 between second and third, which is about double that between third 

 and fourth. Mandibles of female about two-thirds as long as the ceph- 

 alothorax : the claw-furrow is armed on the anterior margin with about 

 8 teeth ; first somewhat stronger than the following, (generally) re- 

 moved from second by a very long toothless space, and placed opposite 

 to the fourth teeth of the posterior margin, the first tooth of which is in 

 general much farther removed from the second than this from the next 

 following; the claw of mandible is provided with a small protuberance 

 near the base on the outer side. The tibial part of the male palpus 

 longer than the patella, its long apophysis being provided with a pro- 

 tuberance toward the middle of the inner side. Legs testaceous, their 

 joints more or less evidently brownish or blackish at the apices, the 

 metatarsus and tarsus of tlie first pair of legs together shorter than 

 patella, tibia, metatarsus, and tarsus of the fourth pair of legs ; belly 

 blackish, with two more or less distinct parallel yellow longitudinal 

 bands. — J 5 ad. Length 4-10 millim. 



Forma principalis. — Interval between the two lateral eyes much small- 

 er than that between the anterior and posterior centrals ; tibial joint of 

 the male palpi at least half as long again as the patellar joint; cephalo- 

 thorax brownish-j ellow, sometimes sooty at the margins, and then pro- 

 vided with a sooty V anteriorly ; sternum brownish-yellow, sometimes, 

 blackish at the margins ; abdomen brownish or yellowish, with a ramified 

 longitudinal black line along the back and often an undulated paler 

 band on each side. 



9 . — Length of body 8J millim. ; length of cephalothorax 3, breadth of 

 same 2 millim, ; length of mandibles 2, of palpi 4 millim. Legs : I 21, 

 II 15^, III 81, IV 12^ millim.; metat. + tars. I 8, pat. -1- tib. -f metat. 

 + tars. IV 8| millim. 



$ . — Length of body 6^, of cephaloth. nearly 2J millim.; breadth of 

 cephaloth. If millim.; length of mandibles 2^, of palpi 4 millim. Legs : 

 I 211, II 16, III 7f , IV 13J millim. ; metat. + tars. I 8, pat. + tib. + 

 metat. + tars. IV 8f millim. 



