12 ARKIV FÖR ZOOLOGI. BAND (j. N:0 2. 



The iower jaw is much narrower than the upper one 

 and curved near the top, where it tapers gradually; it has 

 exactly in the curve, ventrally a narrow finger-shaped ap- 

 pendage, which curves obliquely forwards and upwards para- 

 lell to the top of the jaw, This appendage is most probably 

 homologuous with the appendage found in S. formicorum, 

 allthough in that species it is somew^hat differently placed. 



The folps (Fig. 11) resemble much those of S. forynico- 

 rum; the 1st, 3rd and 4th joints are very small; the 2nd 

 joint widens gradually towards the top, where it is cut off 

 obliquely; it has a dorsal pectinate hair behind the middle; 

 the 3rd joint has two straight, finely pointed hairs, one 

 dorsal posteriorly, the other ventrally and anteriorly; the 

 4th joint has one dorsal hair close to the posterior margin; 



Fig. 13. Fig. 14. 



Fig. 12. 4th leg. «-°/i. 



Fig. 13. Top of tarsiis I, with claw. ^'^^/i. 

 Fig. 14. Top of tarsus IV with claw. ^^'/i. 



the 5th joint is comparatively longer and narrower than in 

 the other species, but has the same number of hairs viz. 6, 

 which moreover are of quite similar shape and placed in the 

 same way as in S. formicorum, the terminal ones being in- 

 serted on low tubercles. The shape of the maxillse I have 

 not been able to see, 



The ahdomen (Fig. 9) exhibits a remarkable feature, in 

 so far as that the first transverse furrow is much deeper 

 than in the other species, and the portion which it separa- 

 tes from the rest of the abdomen is wider, with strongly 

 projecting rounded sides and in consequence has all the 

 appearance of being a veritable segment. 



This portion is deeply concave anteriorly and embraces 

 the base of the cephalothorax; the posterior margin is con- 



