WITH DESCRIPTIONS OF NEW SPECIES 1 9 



Order SYM PHYLA. 



I. Species generally larger and more robust, with the first pair of legs 

 always well- developed and more than half the length of the 

 following pair ; the exopods well-developed and conspicuous. 



Posterior margins of all the dorsal scuta but the last one slightly 

 rounded or emarginate, angles generally broadly rounded. 



Dorsal surface of the hind pair of legs furnished with numerous 

 setae. Cerci without striped terminal area or transverse lines at 

 tips. Genus Scutigerella, Ryder. 



II. Species smaller and more slender, with the first pair of legs rarely 

 more than one-half the length of the following pair (S. notacantha 

 is the only exception), and more usually rudimentary ; none of the 

 exopods well-developed. 



Posterior margins of all the dorsal scuta but the last one pro- 

 duced into a pair of triangular plates. 



Dorsal surface of the hind pair of legs furnished with very few 

 setae. Cerci usually with a striped terminal area, and often in 

 addition with raised transverse lines on the most distal part outside 

 the area. Genus Scolopendrella, Gervais. 



TABLES OF THE SPECIES. 



Genus SCUTIGERELLA, Ryder. 



I. Last dorsal scutum with a very deep and somewhat large cavity, 

 overlapped anteriorly and situated in the middle of the posterior 

 margin. 



1. Posterior lobes of the thirteenth dorsal scutum without a 

 pair of processes ; surface of all scuta and the cerci rather 

 closely and minutely setose. Cerci from three to five times 

 as long as broad at base. Tactile hairs on the last segment 

 short and very fine. 



a. Size larger (4 - 5~8 , mm.). Setae on cercus about one- 

 fifth as long as the depth ot cercus, more numerous. 

 Setae on legs more numerous and less conspicuous. 

 immaculata (Newp.) 



/'. Size smaller (about 3*0 mm.) ; setae on cercus about two- 

 fifths as long as the depth of cercus, fewer; setae on 

 legs long and conspicuous, less numerous. 



spinipes, Bagnall. 



