THE GENERA AND SPECIES OF SYMPHYLA. 63 



verse lines on the distal part of the cerci, and the secondary 

 lateral brandies from the central rod of the head; are not met 

 Avith in any other species of the genus; in the two first-named 

 features this group agrees witli the geuus Scutigerella. Only 

 one species is known . . 1. S. notacan tha, Gerv. 



Species of Group II. 



a. Nearly all the setee on the antennae are very con- 

 spicuously jDubescent, and also thick froui the base to near 

 the acuminate end . . 2. S. microcolpaj Muhr. 



h. All seta3 on the antenna? naked, slender, and tapering 

 from the base to the end. 



o. The legs of the first pair robust, and longer than the 

 tarsus of the last pair. The cerci considerably shorter than 

 the last pair of legs, with rather few seta), and the terminal 

 area nearly as long as their depth . 3. S. subnuda, n. sp. 



/3. The legs of the first pair rather slender, and shorter 

 than the tarsus of the last paii*. The cerci slightly longer 

 than the last pair of legs, with a very large number of setee, 

 and the terminal area nearly three times shorter than their 

 depth. . . . . 4. S. Silvestrii, n. sp. 



Species of Group III. 



A. All seta) on the antennas naked and slender. 



a. The last pair of legs with two or three long protruding- 

 dorsal seta) on the metatarsus, and at least three similar seta) 

 in the anterior dorsal row on the tarsus. The terminal area 

 on the cerci looks downwards. 



a. The last pair of legs with three long protruding dorsal 

 seta) on the metatarsus, and four to five in the anterior dorsal 

 row on the tarsus. The cerci rather large and densely clothed 

 with seta). (The second scutum with its antero-lateral setic 

 considerably or very much shorter than its processes.) 



§. The cerci with many of the seta) long and protruding in 

 all directions . . . 5. S. Isabel Itc, Grassi. 



