THE GENERA AND SPEOIES OF STMPHYLA. 81 



ing" joints in S, Isabellas have respectively three and four 

 01' five seti© ; the cerci have only lialf as many setse as in 

 S. Isabella, and only a few of them at the lower margin 

 are long and protruding, while in S. Isabellte a good 

 number of rather long seta3 protrude in all directions; the 

 distance between the processes of the second scutum is 

 somewhat longer than the processes, while it is much shorter 

 than these in S. Isabella?; some minor differences can be 

 derived from the descriptions. Of both species I have 

 examined specimens which had not acquired the full number 

 of legs, and it was not difficult to separate them with 

 absolute certainty. Most European specimens mentioned in 

 the literature as S. notacantha, Gerv., and some of the 

 specimens considered by Grassi as S. Isabellfe (see above), 

 certainly belonged to this species, which seems to be so 

 common and so widely distributed in Europe that the name 

 S. vulgaris will probably be deemed appropriate. 



8. Scolopendrella neotropica, n. sp. PI. 7, figs. 

 2 a— 2 g. 



Material. — Two adult specimens, and a third one in 

 which the last pair of legs have not been developed. 



Head. — Only a little or very little longer than broad. 

 The central rod is interrupted at the middle ; its anterior 

 part is conspicuous but narrow ; the frontal branches are 

 thin. 



Antennte. — In the two adult specimens they contain 

 eighteen and twenty-one joints. Tlie setfe in the central 

 whorls are naked, slender, and tapering from the base, rather 

 long on the proximal joints (fig. 2 a), and scarcely half as 

 long on the most distal joints ; the setas on the inner side of 

 the second, third, and fourth joints are about twice as long 

 as those on the outer side. The secondary Avhorl begins on 

 the lower half of the outer side on the fifth or sixth joint ; 

 on the eighth or ninth joint it is completely developed on 

 the upper half (fig. 2 a, representing the seventh joint, shows 



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