RHINOCRICUS.—OXYPYGE. 73 
This species, the type of the subgenus Hurhinocricus of Brélemann, must be nearly 
related to the form described above (p. 67) as Rhinocricus omilteme. The number of 
segments ranges from 45-49 and the length from 34-47 millim. As in R. omilteme, 
there are only four sensory papille on the antenne, and the transverse sulcus of the 
segments is replaced dorsally by a secondary sulcus. 
The subgenus Eurhinocricus rests upon the structure of the gonopods. One 
peculiarity, however, upon which Brélemann lays stress can hardly be given the 
importance he claims for it. This is the fact that the guard of the seminal style 
consists of two thick chitinous rods united by membrane. The guard may be seen 
to be constructed on a similar though not identical plan in such species of Rhinocricus 
as I. smithi and R. aurocinctus, two species which further resemble R. biolleyi and 
fi. omilteme in having only four antennary sensory papille, a feature formerly 
considered by Brélemann to be also peculiar to the subgenus Eurhinocricus. 
Although &. biolleyi is closely allied to 2. omilteme, the two appear to differ at 
least in the shape of the sternal plate of the gonopods, the inferior process of this 
plate being much thinner in #. omilteme than in R. biolleyi. Judging, too, from 
the figures, the guard of the seminal style is longer as compared with the distal 
segment in the latter than in the former species. 
OXYPYGE. 
Oxypyge, Silvestri, Boll. Mus, Torino, xi. no, 254, p. 4 (1896). 
Differs from Zthinocricus in having the summit of each anal valve produced into a conspicuous backwardly- 
directed spine. 
Type, O. varicolor. 
in spite of Brélemann’s opinion that the above-mentioned character upon which 
Oxypyye is based is not of generic or even subgeneric value, I think the importance 
Silvestri attached to it may be reasonably admitted. 
1. Gxypyge varicolor. 
Oxypyge varicolor, Silvestri, Boll. Mus. Torino, xi. no. 254, p. 4 (1896). 
Colour variable, either wholly blackish or blackish with two dorsal rows of pale spots and yellowish legs. 
Eyes subcircular, consisting of about 30 ocelli. Anterior portion of seyments smooth ; posterior portion 
rugose, inferiorly striate; transverse sulcus complete. Scobinw extending from the 2nd to the 42nd 
segment. TYeryite of anal segment with short attenuate caudal process, not surpassing the valves, 
which have their margins undefined by a groove; sternal plate triangular. Sternal plate of gonopods 
semicircular, with its inferior edge produced into a subquadrate process. Phallopod as in typical 
members of /thinocricus; the distal segment long and slender; the seminal style short; the guard wide, 
much longer than the style. 
Number of segments 54. Length 50, width 4 millim. 
Hab. Istumus or Darren, Punta Sabana and the forest near Lago de Pita (Festa). 
BIOL. CENTR.-AMER., Diplop., September 1908. L 
