Mr. R. I. Pocock on Scolopenclra valida, Lucas. 337 



120-130 millirn.) with anterior tergites olivaceous, posterior 

 ochraceous, proximal segments of antennse and distal seg- 

 ments of anal legs nearly black, legs pale green, head-plate 

 and first tergite olivaceo-castaneous. One specimen (190 

 millim.), also from Socotra, exhibits coloration of the two 

 last, but has the legs nearly black. 



Antennce consisting of from 19-27 segments, the number in 

 some instances being different on the two sides ; varying in 

 length from a little less than one third the length of the body 

 to a little less than one fifth. Three or four basal segments 

 bare, the rest clothed thickly with short hair ,• segments more 

 moniliform in the smaller specimens. 



Head-plate very constant in shape, the width in nearly 

 every case being equal to the length. In the larger forms 

 equal to about three fourths the width of the anal tergite, in 

 the smaller the two plates are approximately equal in width. 

 Faintly punctured and always marked throughout its length 

 by two faint anteriorly diverging sulci. 



Plates of maxillary inosternite either in contact or slightly 

 separated ; each plate furnished with teeth which exhibit 

 various grades of concrescence. In the smaller forms these 

 teeth are mostly four in number, small, distinct, and tolerably 

 sharp. In the larger forms the external tooth remains sepa- 

 rate, but the three internal begin to coalesce until, in the 

 largest specimens examined, each plate appears to be fur- 

 nished with but two teeth — a larger internal, which is more 

 or less obscurely divisible into two or three parts, and a 

 smaller external. 



Basal tooth always bidentate, though sometimes in small 

 specimens obscurely so. 



Tergites^ except the first and last, always bisulcate, except 

 the five, six, or seven first marginate. The first tergite 

 sometimes showing very faint signs of the two sulci, but 

 always deeply grooved transversely in its anterior half. The 

 anal tergite never with a central longitudinal sulcus. 



Sternites, except the last and the first ('? always), bisulcate ; 

 the last sometimes with a faintly-marked median longitu- 

 dinal depression ; lateral margins slightly converging poste- 

 riorly, the angles always rounded, and the posterior margin 

 straight or very slightly convex. 



Anal pleurce finely punctured, more or less truncate; in 

 larger forms furnished with a short process ; process usually 

 armed with three spines, but the number of spines varying 

 from two to six, and in some cases differing upon the two 

 sides. A spine always present on the posterior external mar- 



