1881.] 



NATURAL SCIENCES OF PHILADELPHIA. 



85 



S. americana Packard. 

 Hab. Salem, Mass. 

 S. gratiae Ryder. Am. Nat.. XIV, p. 



Proc. Bost. Soc. Nat. Hist., XVI, p. Ill, 1873. Name only. 



Fia 



-S. gratia. 



75, 1880. Name only. 



This species (Figure 1.), may be distin- 

 guished from S. immnculata by the presence 

 of a pair of stout hairs which diverge outwards 

 from the sides of the body at each segment. 

 Head wider than bod}^, not cordate but sub- 

 pentagonal from above. A single pair of eyes 

 on the sides of the head behind the antennae, 

 not visible from above. AntenniB twent^^-one- 

 articulate. Length 2 to 2-5 mm. Habitats: 

 Fairmonnt Park, Philada ; Havre de Grace, 

 Md. ; Washington, D. C; Franklin Co., Pa. 

 Under stones, sticks and in damp mould. 



I dedicate this handsome species to my 



sister. 



S. microcolpa Muhr. Zoolog. An- 

 zeiger, IV, 1881, pp. 59-61, 

 figs. 1, 2 and 4. 



Enlarged 25 times. 



Is near S. notacantha, 

 but is said to have no ventral appendages at 

 the bases of the legs. I would remark, how- 

 ever, that in the specimens thought to be nota- 

 cantha, I find these appendages present, but 

 they are extremely small and maj' easily be 

 overlooked. Muhr's paper is a valuable con- 

 tribution however to the anatomy of the mouth 

 parts of a form near the species first described. 

 Habitat, Prague, Bohemia. 



Figure 2, representing an American, speci- 

 men of the same, or nearly the same, as S. 

 notacamha, has a veiy suggestive resemblance 

 to Japijx in the shape of the body; whether 

 this is more than a resemblance I forbear 

 to suggest. Xo doubt now remains in my 

 mind that dissimilar as LejAsma, Machilis, 

 Lepismina, Nicoletia, Gampodea and Japyx 

 at first appear upon comparison with each 

 other, their principal characters suggest in 



Fig. 2. — S. notacantlia. 

 Enlarged 25 times. 



