16 Abdominal Sternites in Palpatores 



five unmistakable sternites in Trogulini there is a pair of impressions, corresponding to 

 protuberances on the inside for the attachment of muscles, and which consequently mark 

 the limits between sternites just as well as the grooves. But a pair of such impressions 

 are also found on the foremost sternite, nearly in the middle of it, and at a considerable 

 distance from operculum genitale. These impressions are seen particularly well in Anelas- 

 mocephalus, especially in A. lycosinus W. S. {u, woodcut fig. F). In Trogulus they are not so 

 distinctly marked except the two first pairs, on the middle of the foremost sternite and 

 behind the anterior margin of the second. In Dicranolasmatini a more or less sharply 

 defined groove is found far behind operculum genitale extending across the foremost sternite, 

 and behind it two generally weak impressions of broadly triangular shape ; this groove is 

 especially sharp in Amopaum Sorensenii Thor. In Nemastonia, no distinct groove can be 

 traced across the foremost sternite ; but, far behind operculum genitale, two, usually deep, 

 triangular impressions are found. In Phalangioidaj finally a generally shallow groove extends 

 across' the foremost sternite close behind the base of operculum genitale, which is here 

 very long; immediately behind the groove a pair of generally slight impressions are noticeable 

 {u in woodcut fig. A)-. We conclude that immediately in front of them, or along this 

 transverse groove, lies a boundary line between two sternites, showing that the sternite which 

 authors describe as the first consists of two. It is also well worth noting that the distance, 

 between the posterior mai'gin of the so-called first sternite and the groove or the pair of 

 impressions which indicate the boundary between the two sternites of which the so-called 

 first sternite consists, is always constant, being equal or nearly equal to the length of the 

 smaller second sternite, whilst the distance between the groove and the base of operculum 

 genitale varies according to the size of the latter, as we have already indicated. 



One more feature in connection with this so-called first sternite craves our attention. 

 In both sexes of Sclerosoma, in the female^ of Mastobunus tuberculifer Luc, and in the 

 female of Astrobunus KocJdi* Thor. as well as in the females of several species of Gagrella^, 

 the sternites are divided into a larger middle piece and two smaller lateral pieces, which 

 in Sclerosojna have a backwards slanting position. But where this feature occurs there are 

 five pairs of such lateral pieces corresponding to the four first sternites (woodcuts figs. C, B, E), 

 and the position of the foremost pair of these lateral pieces leaves no doubt as to their 

 belonging to the anterior portion of the so-called first sternite ; in those species moreover, 

 in which we have been able to ascertain the position of the spiracles", these are always 

 situated opposite this lateral piece', or on, or opposite' the anterior portion of that part 



' In some cases, as in Leiohuiium, particularly L. rotun- '' These represent all the families of the suborder Pal- 



du7n Latr., the groove does not extend quite across the whole patores. 



sternite, but is visible only in the middle, and even there " In some Gagrellini, as in G. sordidatti Thor. i and in 



sometimes not clearly. ilelanopa Thor., only one pair of lateral pieces is found, which 



- These impressions are sometimes so weak as to be corresjionds to the foremost pair, where there are more, 



scarcely visible, as in the genera allied to Sclerosoma. As a 'In Nemastoma {luijubre 0. F. Miiller) the spiracles are 



rule those near the anterior border of the so-called second to situated on a long piece of chitine in the posterior wall of the 



fifth sternites are difficult to distinguish, but in Leiobunum, groove which separates the fourth coxa from abdomen ; and 



particularly L. rotundum Latr. and in Garirella chatopus here too the spiracles are placed opposite the foremost of the 



Thor., they are very distinct. parts mentioned as bijlonging to the so-called first sternite. 



' The male has only two pairs of lateral pieces which In Gagrella mimiJ- Thor. each of the large spiracles is likewise 



flank the "first" sternite. placed in a strongly chitinized piece of the posterior wall of 



■■ The only species of this genus with which we are the groove, between the fourth coxa and abdomen, which 



acquainted. The male is not known to us. together with another smaller one, distally placed iu relation 



•'' Thus in G. Fecr Thor., G. chcetoptis Thor., G. mimi.t to it, corresponds to the one piece in XcmuKtoma. 

 Thor. and G. sordidata Thor. 



