158 DIPLOPODA. 
Distribution. Central America and the northern countries of South America 
(Colombia, Venezuela). 
Brélemann gave no reasons for separating this genus from Euryurus, Koch, although 
one of the species he referred to it, namely dealbatus, Gerv., was placed in it by 
Peters and by Humbert and de Saussure ; and, curiously enough, Attems appears to 
have overlooked the fact that the species he described under the name Euryurus seem 
to be generically inseparable from those that Brélemann referred to Aphelidesmus. The 
type of Furyurus, E. erythropygus, was unknown to these authors; but, although it is 
similar in general features to Aphelidesmus, the structure of the phallopod, as Carl has 
shown (Rey. Suisse Zool. xi. p. 562, 1903), and as is borne out by a specimen in the 
British Museum, is very different in the two. In Huryurus it is formed like that of 
Amplinus and Platyrhacus, the distal segment being undifferentiated into femoral, 
tibial, and tarsal segments, and ending in two simple slender branches, of which the 
inferior (aboral) is the seminal stile, and the other the auxiliary branch; the distal 
extremity of the phallopod is sharply bent downwards. 
Of Euryurus two species, namely H. erythropygus, Brandt., and £. australis, Bollm., 
appear to be known. These have only been recorded from the southern parts of 
North America (Indiana, ‘Tennessee, Carolina). 
1. Aphelidesmus glaphyros. 
Euryurus glophyros, Attems, Denk. Akad. Wien, Ixvii. p. 279, t. 7. figg. 163, 164 (1900)’; 
Brélemann, Ann. Soc. Ent. France, Ixxiv. p. 853 (1905) *. 
Colour banded brown and yellow, first tergal plate dark brown in front, yellow behind ; posterior half of 
prozonites and anterior half of metazonites brown, anterior half of prozonites and posterior half 
of metazonites yellow; antenne, legs, tail, and ventral surface yellow. Antenne short. First tergal 
plate wide, somewhat wider than the following segments ; transversely elliptical, with rounded Jateral 
angles. Dorsal surface vaulted ; keels following the slope of the back, small, with rounded anterior 
angle; posterior angle with a small sharp tooth. Pores ventral near the posterior end of the thickening. 
Caudal process long and wide; the lateral borders slightly converging, posterior border rounded, 
emarginate. Sterna small, quadrate, transversely and longitudinally sulcate. 
Length about 35 millim., width of ¢ 3, of Q 3°5. . 
Hab. Costa Rica}, Carrillo 600 metres, Cuesta del Tablazo 1500 metres (Biolley °), 
Cariblanco 600 metres (Lankester ?).—? Banamas, Great Island }. 
Fam. STRONGYLOSOMIDA. 
Strongylosomatide, Cook, Ann. N. York Acad. Sci. ix. p. 5 (1895) (in part.). 
Strongylosomine, Attems, Denk. Akad. Wien, Ixvii. p. 271 (1899). 
Keels of the second segment projecting at a lower level than those of the third and succeeding segments, 
moderately wide and jutting forwards beneath the inferior angle of the narrow first plate; keels of the 
rest moderately well developed and with thickened margins carrying the pores or reduced to a very 
