32 A SYNOPSIS OF THE BRITISH SVMPHYLA 



European examples, four collected by himself, together with 

 S. microcolpa, at Palmi, Calabria, one taken Mr. C. Borner 

 either at Catania or Palmi, and another example by Mr. 

 Borner from Marburg, Germany. 



Group III. — As in Group II., but first pair of legs 

 obsolete. 



A. — Size larger and more robust ; last pair of legs with three 

 long protruding dorsal settz 011 the meta-tarsus, and Jive or some- 

 times four on the tarsus. Seta on margins of scuta more 

 numerous. 



Scolopendrella isabellae Grassi. (PL I., figs. 14 and 15). 



Grassi, Mem. d. Reale. Accad. d. Sci. di Torino, ser. 2, xxxvii., 

 pp. 594-5, 1886; Hansen, Quarterly Journal of Micro- 

 scopical Science, xlvii., pp. 74-77, pi. 6, figs. 4a-4h, 

 1903. 



This form is larger than S. vulgaris, to which species it is 

 somewhat closely allied. It may be readily separated by the 

 longer cerci, these being four and one-half times as long as 

 deep, by the shape of the cercus and by the more numerous 

 seta? (including both moderately long and short ones inter- 

 mingled) which are more closely placed. The leg of the last 

 pair presents a good characteristic in the disposal of the 

 dorsal seta?, the tibia possessing two and the metatarsus three 

 rather long ones, whilst the tarsus has a series of five (or in 

 some specimens only four) seta?, which are shorter than those 

 on the tibia and metatarsus. In S. vulgaris the dorsal out- 

 standing bristles of the hind-leg are all rather long, and 

 comprise two on both tibia and metatarsus, and only three on 

 the tarsus. There are minor but important differences in the 

 shape and chaetotaxy of the scuta. 



I have only seen one British specimen (from Penshaw) that 

 quite agrees with Hansen's diagnoses, but numerous examples 

 from Gibside must be regarded as a variety, for which I 

 propose the name dunelmensis. 



