(2 DIPLOPODA. 
26. Rhinocricus nodosicollis, 
Rhinocricus nodosicollis, Br6lemann, Ann. Soc. Ent. Fr. 1905, pp. 372-3874. 
Hab. Costa Rica, Cariblanco (Lankester). 
This species may be distinguished by a combination of the three following features, 
namely, the presence of only four sensory papille upon the terminal segment of the 
antenne ; a forward expansion of the first tergal plate to form a rounded lobe below 
the level of the eye; and the length of the caudal process, which projects considerably 
beyond the summit of the valves. The gonopods resemble somewhat those of 
RR. costaricensis, but the inferior portion of the sternal plate is less abruptly narrowed 
and there is no spiniform tooth upon the apical expanded portion of the guard. 
Number of segments 38-39. Length 61-69, width 7-8°3 millim. 
It is mainly by the structure of the first tergal plate that A. nodosicollis may be 
distinguished at once from those described above, which resemble it in having a small 
number of antennary sensory papille. Brdlemann apparently believed that the 
number of papille in these and other allied species was constant and always four. 
He even proposed to divide the genus khinocricus into two sections, named respectively 
Tetrarhabdi and Polyrhabdi, the former embracing the species with four papille and 
the latter those with many papille. But since four is not a constant number for the 
papille of the first group, the name proves to be ill-chosen. If a name be wanted, 
Oligorhabdi would be preferable. The character, nevertheless, is an extremely useful 
one for differentiating the numerous species of this difficult genus, and Brdlemann 
is to be congratulated upon its discovery. 
27. Rhinocricus ocraceus. 
Rhinocricus ocraceus, Brélemann, Mém. Soc. Zool. Fr. 1900, pp. 124, 125, t. 8. figg. 115-119. 
Hab. Istamus or Panama, Obispo (coll. Gazagnaire). 
This species, which in all its characters appears to be a typical Ahinocricus, may be 
distinguished from the rest of the Central-American members of this genus known up 
to the present time by its very small size, the total length of the male being only 
26 mm. and the width less than 3mm. It is also remarkable for the form of the 
anal segment, the valves of which are simply rounded and neither compressed nor 
margined, their summit being covered by an almost tuberculiform caudal process. 
The scobine extend to the 28th segment, that is to say considerably past the 
middle of the body, which consists of 44 segments. 
28. Rhinocricus biolleyi. 
Rhinocricus (Eurhinocricus) biolleyi, Brélemann, Aun. Soc. Ent. Fr. 1903, pp. 182-185, t. 1. 
fige. 1-6; op. cit. 1904, pp. 871, 372, t. 10. fig. 22. 
Hab. Costa Rica, San José and Cachi.—Cocos I. 
