50 DIPLOPODA. 
has been hitherto discovered in Central America; the other, Siphonocybe, nov., is, 
however, represented in the Neotropical Region, as is testified by the presence of the 
typical species, 8. hartii, Poc., in Trinidad [Ann, & Mag. Nat. (6) xv. p. 375 (1895)]. 
Hence it may be inferred that the genus also occurs at least in the southern parts of 
Central America and merely awaits discovery. It may be distinguished from Siphono- 
phora by the presence of a tubercular prominence or keel, bearing the pore, on each 
side of the somites. 
SIPHONOPHORA. 
Siphonophora, Brandt, Bull. Acad. St. Pétersb. i. p. 179 (1836) ; and subsequent authors. 
Characters as above. 
Distribution. Neotropical and Oriental Regions. 
Synopsis of the Central-American Species known to me. 
a. Rostrum short, much shorter than the head, which is wide and rounded ; 
anterior border of first tergal plate lightly emarginate . . . . . . . globiceps, sp. n. 
b. Rostrum long, subequal in length to the head, which is narrowly piriform ; 
* anterior border of first tergite deeply emarginate. 
a‘, Antenne distinctly incrassate, a little surpassing the rostrum . . . . brevicornis, sp. n. : 
b. Antenne long, considerably surpassing the rostrum, and _ scarcely 
Incrassate. 2 6 1 ew eee ee eee ww ww ew ee COrnULA, SP. TL 
1. Siphonophora cornuta, sp. n. (Tab. V. figg. 4, 44.) 
©. Colour a uniform yellowish-brown. | 
Head narrowly piriform. Rostrum long, about equalling the head in length. Antenne long, when extended 
overlapping the extremity of the rostrum almost by the length of the two terminal segments; the 
segments relatively long, the fifth as long as wide, the basal segments nearly as thick as the distal: hence 
the antenne are but slightly incrassate. First tergal plate with its anterior border deeply emarginate. 
Number of segments 91-100. 
Length of large specimen 40, width 1°5 millim. 
Hab. GuatEMata, Volcan de Acatenango, 1200 feet above the forest, Volcan de Agua 
(Stoll). 
2. Siphonophora brevicornis, sp. n. (Tab. V. figg. 5, 5 a.) 
Colour as in S. cornuta. 
Head, rostrum, and first tergal plate also as in that species; but the antenne much shorter, only a little 
surpassing the rostrum, and very decidedly incrassate. 
Number of segments in 9 up to 74. Length of large 9 21, width 1 millim. 
Number of segments in ¢ 55. Length 13 millim. 
Hab. Guatema.a, Volcan de Agua (Stol/). 
A specimen from Omilteme in Guerrero (#H. H. Smith) is doubtfully referred to this 
species. It has 59 segments, and measures 12 millim. in length. 
sh Ra a 
