RHINOCRICUS. 71 
23. Rhinocricus dugesi. 
Spirobolus (Rhinocricus) dugesi, Bollman, Bull. U.S. Nat. Mus. no. 46, pp. 190, 194 (1893). 
Hab. Mexico, Guanajuato (Dugés). 
FR. dugesi resembles RF. hagedussit in possessing a long caudal process, but, judging 
from the description, may be distinguished from that species by having the anal valves 
very strongly margined. 
Number of segments 50. Length 55, width 5 millim. 
24. Rhinocricus obesus. 
Rhinocricus obesus, Brdlemann, Mém. Soc. Zool. Fr. 1900, pp. 107, 108, t. 7. figg. 59-65. 
Hab. Guatema.a (Rodriquez). 
Judging by the shortness of the antenne, the large number of sensory papille, and 
other characters, this species appears to be related to &. tristant and R. aposematus, 
but certainly differs from both. The posterior borders of both tergal and sternal plates 
of the anal segment are transverse and scarcely produced, and the guard of the 
phallopod in the male is bent at right angles to the axis of the style, lying across it 
almost at a right angle. 
Number of segments 45-46. Length 99-100, width 12°5 millim. 
Under the name rubicundus, Brélemann has described what he believes to be 
a variety of &. obesus from Cariblanco in Costa Rica (Ann. Soc, Ent. Fr. 1905, 
pp. 376-378). It seems to differ from the typical form in having the segments more 
distinctly sculptured with striole. Length from 106-143, width from 13:5-17 millim. 
25. Rhinocricus costaricensis. 
Rhinocricus costaricensis, Brdlemann, Aun. Soc. Ent. Fr. 1905, pp. 375-6, t. 10. figg. 26-28. 
Hab. Costa Rica, Cariblanco. 
Blackish, shining, with the antenne and legs yellow. Antennee very short and 
claviform, with many sensory papille. The posterior portions of the segments are 
shining and wrinkled along the sulcus, which is deep. ‘The caudal process covers but 
does not surpass the valves, which have prominent and compressed but not sulcate 
margins. 
Number of segments 44. Length 81, width 9-4 millim. 
Apparently allied to &. aposematus and R. tristani, but differing from both in 
colour and in the form of the gonopods. ‘The style of the phallopod is straight and 
very much shorter than the guard, which is very broad apically, with a somewhat 
rounded margin and a small dentiform process. The inferior portion of the sternal 
plate is narrow and linguiform. 
