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base and inner side, and pointing obliquely inwards, is strong and 

 In-ofd, compressed, claw-like, with a slender pointed extremity bent 

 forward: on the base of this process, inward, is a fine, pointed 

 tooth: on the posterior convex edge of the process, just where it 

 curves forward, we sometimes meet with one or two very small ele- 

 vated points or tubercles. The other process , which is longer and 

 narrower, and situated a little in front of and outside the former 

 or posterior, has the form of a long, sharp spine, abruptly bent at 

 a right or rather acute angle ; its first or basal part is somewhat 

 curved and directed forward and inward, the long extremity being 

 directed inwards and somewhat backwards. Immediately above the 

 point where it is thus abruptly bent, it throws out a sharp tooth 

 in the opposite direction , so that the whole process has the form 

 of an irregular x or an anchor ("malleus lapicidarum": Westr.). 

 The lamina has at the base, on the outer edge, a strongly projec- 

 ting, almost white, transparent, blunt process, which appears to in- 

 clude a black, curved bristle (the upturned end af the bulbus'long, 

 circularly curved spine), which in dried specimens usually becomes 

 separated from the pale process, and lies beside it, the process itself 

 in such specimens being dried up to a thin thread. The outer pro- 

 cess of the pars tibialis is short and thick, scarcely reaching to V, 

 of the length of the lamina; it terminates immediately behind the 

 process of the lamina. The process on the under side of the tibial 

 joint is about as broad as it is long, narrower in the middle, so 

 that the anterior and posterior edges are concave; it dilates towards 

 the extremity and is drawn out in front to an acute angle. The 

 truncated extremity has a little notch at the posterior angle, and in 

 a certain position a similar notch is visible also at the anterior, 

 whereby a slightly three-toothed appearance is given to the process 

 at its termination. The female's vulva is composed of two small 

 rounded fovese, separated by a longitudinal, narrow, in the middle 

 contracted, almost )(-formed, slightly elevated and flattened septum. 

 Behind these fovese may be perceived a small, shallower depression 

 divided into two by a longitudinal elevation, which however is not 

 always conspicuous. 



2. X Kochii (X. viaticus C. Koch). The bulbus genitalis has 

 beneath, nearer the base, two tolerably strong processes of almost 

 equal thickness, which at the root are close together (not widely se- 

 parated as in X. cristatus), afterwards diverge, but have their ex- 

 tremities curved almost towards each other; that nearest the base is 



