THE GENERA AND iSi'EOlES OF SYMPHYLA. 3 



referable to that species. He lias examined specimens 

 wliich, in his opinion, belong' to S. uotacautha; Latz., and 

 on these specimens he establishes his new S. Isabellee, 

 which, above all, is distinguished from S. not ac ant ha, 

 Clerv., by having only eleven pairs of legs, whereas twelve 

 pairs are found in the last-named species. In S. Isabellas 

 he has discovered "una papilla brevissima" furnished with 

 hairs, without claws, and not divided into joints, placed on the 

 latero-ventral part of the first segment of the trunk, and he 

 thinks that its distance from the median line is so long that 

 it cannot easily bo considered as homologous with the first 

 pair of legs in S. notacantha, Gerv. But in Scol. 

 Silvestrii, n. sp., described below, the first pair of legs 

 have as many joints as in S. notacantha, Gerv., but they 

 are much shorter and inserted as the "papilla" in S. 

 Isabellas, and it must be taken as granted that the wart- 

 like protuberance in the last named, and in several other 

 species, is a very reduced leg ; it is also present in specimens 

 in which the posterior pairs of legs have not yet been 

 developed. The existence of this pair of wart-like legs 

 separates S. Isabellae sharply from S. notacantha, Gerv., 

 but I have studied two rather closely allied Italian species 

 which both possess the characters pointed out by Grassi for 

 his S. Isabellas; in all probability he has examined 

 specimens of both species, and not wishing to suppress the 

 name given by him I have retained it for the largest of the 

 two species, which also seems to be common at Catania. 



Grassi spends ten pages on the external and internal 

 anatomy, but I will only mention two points. His treat- 

 ment of the sense-organs is rather incomplete; in Scut, 

 immaculata and nivea he has seen none of the oro-ans of 

 the antennae described below. His description of the mouth- 

 parts is rather good (the figures unfortunately poor), and 

 it must be emphasised that he points out mandibles, maxilla), 

 labium (composed " di un semilabbro destro c di uno 

 sinistro"), and a hypopharynx consisting of a ligula and 

 two paraglossce ; a comparison of his interpretations with 



