THE GENERA AND SPECIES OF SYMPHYLA. 19 



minates there in a short, angular projection, which can be 

 seen from below through the skin ; this short, curved part 

 with its angular projection is probably the " cardo " fused 

 with the stipes; a suture between them could not be dis- 

 covered. As in many insects the two elements forming the 

 stipes have been completely fused ; two well-developed lobes 

 proceed from the distal end of the stipes, and a little behind 

 the base of the outer lobe a very short palpus is seen ; this 

 palpus (/.) consists in Scutig. immaculata of one very 

 short joint; in Scolop. vulgaris it is twice as long, and 

 consists of two joints. The main points as to shape and 

 quality of the skin of the two lobes can be seen on the 

 figure. 



The labium shows a considerable resemblance to that of 

 certain insects. The basal part, the "submentum'^ in 

 insects, consists of a pair of narrow, well-chitinised plates or 

 rods (/i.), encompassed on both sides by membranous skin ; 

 near the base of a maxilla each of these rods is articulated to 

 a narrow plate proceeding backwards, and these plates (g.) 

 are the sternum of the segment to which the labium belongs. 

 (The existence of this segment in Orthoptera has been 

 pointed out by me in the paper on Hemimerus [' Entomol. 

 Tidskrift,' Stockholm, Bd. xv, 1894].) The anterior ends of 

 the submeutum are articulated to short posterior prominences 

 of the "mentum," a large shield (i.), a little longer than 

 broad, and divided in the median line by a narrow stripe of 

 membranous skin into two halves. The distal margin of the 

 mentum is concave, and bears two pairs of rather small lobes 

 {k.), well separated by membrane both from the mentum and 

 from each other; besides, the mentum has each anterior outer 

 angle produced into a subtriaugular plate on the side of the 

 outer lobe. 



The hypopharynx and the maxillultS are very interest- 

 ing ; my interpretation is in some respects very different from 

 that of other authors. The hypopharynx (tig. 1 e, h.) pro- 

 trudes freely in the mouth above the distal part of the labium 

 as a rather thick, subquadratic prominence ; its anterior mar- 



