92 DIPLOPODA. 
Now Brélemann (Revista Mus. Paulista, v. 1902) proposed three subgeneric names for 
certain South-American species of this group: | 
Scaphiostreptus (loc. cit. p. 150). Type: the species from Bahia identified by 
Brélemann as S. fuscipes, Porat, in which the phallopod terminates distally in a 
vase-shaped lamina, from the interior of which emerges the seminal style. 
Gymnostreptus (loc. cit. p. 153). Type G. perfidus, Brol., from Sao Paulo, which 
has the phallopod long, attenuated, and unbranched, although in other species 
it may be branched on the distal side of the seminal sinus. 
Cladostreptus (loc. cit. p. 166). Type C. sebastianus, Brél., from Sao Paulo, a 
species in which the phallopod is distinctly biramous (two-branched), the 
accessory branch arising on the proximal side of the seminal sinus. 
he synonymical conclusions I deduce from the above-given analysis are as 
follows :— 
1. Gymnostreptus is a synonym of Plusioporus. 
2. Scaphiostreptus is a synonym of Orthoporus. 
3. Cladostreptus is a synonym of Epistreptus. 
With regard to the first two, 1 do not think there can be any doubt. In the case 
of the third an element of doubt is introduced by the possibility that the branching of 
the phallopod described in the type of Kpistreptus may be of the nature that 
Brélemann has described in some of the species he referred to Gymnostreptus. In that 
case Cladostreptus will stand and not sink as a synonym of Epistreptus. 
The fate of the South-American species referred by Silvestri to the genera Archi- 
spirostreptus and Urotropis must be left unsettled until a careful comparison has been 
made between the African and Neotropical representatives of this group to see if they 
be congeneric or not. It may be added, however, that the phallopod of Urotropis 
carinatus, Porat (Bih. Sv. Vet.-Akad. Handl. xx. pt. iv. no. 5, t. 5. fig. 50, 1894), 
resembles that of Orthoporus, except that it bears a long accessory branch. This is not 
the case in the species from Bolivia named Archispirostreptus cameraniit (Boll. Mus. 
Torino, x. no. 203, p. 9, 1895), which Silvestri: subsequently referred to Urotropis 
(Boll. Mus. Torino, xii. no. 283, p. 6, 1897) on account of the compressed and carinate 
nature of the dorsal surface of the anal tergal plate, this character being no doubt of 
specific and not of generic value. 
As for the species referred to Archispirostreptus, some of them at all events do 
not appear to be generically separable from Plusioporus, since the presence of 
pores on the fifth segment is apparently the only distinctive feature of the last- 
named; and it may be that Plusioporus is a synonym of Archispirostreptus. Ccm- 
parison between the African and American species will show. But Archispirostreptus 
itself may possibly have to give place to Alloporus. The types of these two so-called 
