124 DIPLOPODA. 
subcylindrical, biramous, the inferior (principal) branch gradually narrowed and pointed, slightly sinuous 
and continuing the line of the main branch of the segment, the superior (subsidiary) branch projecting 
upwards and forwards, compressed and pointed, arising nearer to the tip than to the base of the segment. 
Length 17-5 millim., width 5°2. 
Hab. Guatemaua, Senahu in Alta Vera Paz (Champion). 
5. Spheriodesmus stilifer, sp.n. (Tab. IX. figg. 2-2.) 
Colour testaceous or ochraceous. Segments lightly rugulose. Body elongate and narrow. Head with 
sulcus nearly obsolete. The fourth and fifth segments about equal in width, the keels of both with 
rather pronounced sigmoid flexure, the anterior borders strongly convex, the posterior correspondingly 
concave ; the posterior borders of all the keels concave, those of the seventh to about the tenth the least 
so, those of the segments succeeding the tenth becoming gradually more and more concave towards the 
posterior end of the body; the posterior border of the keel of the eighteenth forming a distinct but 
obtuse angle with the posterior edge of the dorsa] portion. 
First leg of male modified ; the femur with strongly convex upper border, hollowed lower border, and a large 
proximal conical process. Sternum of sixth segment narrow, much narrower than length of second 
segment of leg and only a little exceeding length of its basal segment. Socket of phallopods extending 
almost out to the dentiform tubercle, the edge just behind the tubercle raised to form a convex crest ; 
the posterior edge not raised; cove of the posterior legs of the seventh segment comparatively close 
together, separated by a space which is less than their width. Phallopods with distal segment subcylin- 
drical, incurved apically, with a bifid tip; on the inner side near the tip there is a slender stiliform 
‘process bent at right angles ; and above this is an erect spiniform tooth rising some little distance behind 
the extremity of the organ. 
Length 15 millim., width 5. 
Hab. Costa Rica, Irazu (Rogers). 
6. Spheriodesmus digitatus, sp.n. (Tab. IX. figg. 8-3 d.) 
Colowr uniformly yellowish (in alcohol), white when dry. Body narrow and elongate, low, gradually sloped 
downwards posteriorly. Segments smooth and shining, at most minutely sculptured. eels of fourth 
and fifth segments subequal in thickness and rather similar in shape except that the posterior angle of 
the fourth is more acute and the posterior border more concave ; the notch on the inferior border of the 
keel of the fifth farther back than in other species. Posterior borders of the keels, except quite at the 
posterior end of the body, inclined slightly forwards, so that in the posterior half of the body, where 
the posterior angle becomes gradually more and more acute, the hinder border is lightly concave. Posterior 
border of keel of the eighteenth forming an evenly rounded angle with that of the dorsal portion of the 
segment. 
First leg of male modified; the femur arcuate, concavo-convex, with a strong basal tooth-like tubercle. 
Sternal areas of fifth and sixth narrow, narrower than the length of the basal segment of the legs. 
Socket of phallopods extending nearly as far as the spiniform tubercle, the margin slightly raised in this 
region, elsewhere not raised. Sternal area separating the posterior legs of the seventh segment narrow, 
about equal to the length of the second segment of the legs, but these segments are themselves 
comparatively short. Phallopods long and slender; basal segments subeylindrical, not noticeably 
inclined inwards ; distal segment long, slender, and cylindrical, biramous, the upper (subsidiary) branch 
thin and pointed, slightly curved, directed upwards and forwards so as to lie nearly parallel with the 
main branch, which projects straight forwards, is lightly sinuous and a little hooked at the tip; one or 
two longish bristles near its distal end externally. 
Length 16 millim., width 4. 
Hab. GuaTeMata, Volcan de Agua (Séol/). 
