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ment. The anal plate has the lateral 
margins subparallel or diverging back- 
wards. 
x. The distance between the eyes is 
only a little shorter than the length 
of an eye. The outer branches of 
the anal plate diverge considerably. 
17. P. gracilis n. sp. 
x x. The distance between the eyes is 
not half as long as an eye. The 
outer branches of the anal plate 
are parallel. 
19. P. oculatus n. sp. 
§§. The tactile setæ of the third pair terminate in 
an oblong bulb. 
□ . The anal plate has the outer branches seti- 
form and diverging backward, and besides 
an inner rudimentary pair. The hairs on 
the coxa and trochanter of the last pair 
of legs are biramous. 
18. P. pygmæus n. sp. 
□ The anal plate has only two branches which 
are short and triangular. The hairs on the 
coxa and trochanter of the last pair of 
legs are simple, not biramous. 
21. P. claviger n. sp. 
It was impossible to arrange most of the numerous species as 
to their real kinship in this conspectus, if I wished to make use 
of very sharp and practical characters. In the following the spe¬ 
cies are arranged as naturally as possible, and before the species 
which can be considered as members of a natural group I have set 
.forth some remarks on their characters and affinities. 
