110 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 113 
Panama, many specimens from following locations: Cayo Largo, 
above Alahjuela, April 14, 1923, and Juan Dias, June 3, 1923, O. F. 
Cook; Alahjuela, June 20, 1923, H. F. Loomis. 
This is one of the commonest millipeds of the area and originally 
was considered to be S. bioculatus (Gervais) but the answer to this 
question must await reexamination of the type of that species, if it 
exists, or of true topotype males. 
Gonopods shown in figure 6/. 
Family Rhinocricidae 
Genus Eurhinocricus Brolemann 
Eurhinocricus Brolemann, Ann. Soc. Ent. France, vol. 72, p. 131, 1903. 
Eurhinocricus biolleyi Brolemann 
Eurhinocricus biolleyi Brolemann, Ann. Soc. Ent. France, vol. 72, p. 132, pl. 50, 
figs. 1-6, 1903. 
Canal Zone, male, Fort Sherman, April 6, 1925, O. F. Cook; male, 
female, Barro Colorado Island, May 1956, C. W. and M. E. Retten- 
meyer; male, female, Pifia area, March 18, 1958, H. F. Loomis. 
Panama, male, El Valle, March 22, 1958, E. M. and H. F. Loomis. 
Although slightly smaller than Brolemann’s specimens, these agree 
in other particulars. The transverse sulcus is scarcely evident on 
any segment but the supplementary one in front is strongly impressed ; 
pores seldom followed by an impressed sulcus. The slender branch 
of the posterior gonopods usually lies so close to the expanded branch 
as to appear adnate to it, but when the gonopods are dried slightly 
the branches separate, as shown in Brolemann’s drawing. 
Eurhinocricus cooki, new species 
FIGuRE 6g-h 
Houotyrr: Male, USNM myriapod collection 2648, Pifia area, 
Canal Zone, March 18, 1958, H. F. Loomis. 
ParatyPres: Young female, USNM, same collection data as for 
holotype; female, author’s collection, Barro Colorado Island, Canal 
Zone, June 6, 1923, O. F. Cook and H. F. Loomis. 
Diacnosis: The impressed transverse sulcus of the segments, pores 
followed by a long impressed sulcus, apically rounded preanal scale, 
and peculiarities of the gonopods distinguish this species from £. 
biolleyr. 
Description: Male 32 mm. long, 3 mm. wide, with 44 segments 
and ocelli in 7 rows starting nearest segment 1 are 7—7—7-6—5-3-2; 
female 49 mm. long, 4.9 mm. wide, 46 segments and ocelli in 6 rows 
are 7-7-7-7-6-4. Mandibulary stipe surrounded by a raised rim; 
