DIRHABDOPHALLUS, 163 
those that Carl examined in the Geneva Museum. In any case they are not the 
original and typical examples of the species and may prove to be specifically distinct 
from it. 
Key to the Central-American Species. 
a. Slender, keels small, their width less than half the width of the metazonite ; 
auxiliary ramus of phallopod not abruptly expanded at the tip, its inner edge 
simple, no secondary crest passing in from it to protect the point of the 
seminal stile. 
6. Principal branch of phallopod (seminal stile) stout, with sigmoid curvature ; 
auxiliary branch (sheath) very wide; keels a little larger; no distinct 
yellow band crossing the posterior half of the metazonites. . . . . spatulatus. 
6’, Principal branch of phallopod slender and evenly curved; auxiliary branch 
also comparatively slender; keels smaller ; a pale or yellow band crossing 
the posterior half of the metazonites . . . . . soe oe ee ew . UNSIGEr. 
. Broader, the keels much larger, nearly half the width of the metazonite ; 
auxiliary ramus of phallopod abruptly expanded and spatulate at the tip, the 
inner edge double, giving rise to a secondary crest which passes inwards in 
front of the apex of the seminal stile. 
c. Smaller, length about 30 mm.; sculpturing more definitely granular, with 
the three rows of tubercles on the metazonites clearly defined ; posterior 
border of keels generally with a tooth or anguliform projection; no distinct 
notch in front of the pore-prominence . . . . . . . . es .  rodriguezi. 
c'. Larger, length about 50 mm.; sculpturing coriaceous, coarser or finer; the 
rows of tubercies less obvious. 
d. Lateral border of keels with a distinct notch in front of the pore- 
prominence ; posterior border of pore-bearing keels generally decidedly 
angular, coarsely coriaceous . . . 1 ew ee le » 6 6 « montanus. 
d'. Lateral border of keels forming a continuous curve; posterior border 
also evenly curved, rarely only very feebly angular; finely coriaceous 
on median area of metazonites . . 1 1. 1 ee eee ee ee gto sus. 
1. Dirhabdophallus montanus, sp. n. (Tab. XII. figg. 4-49; XIIL fig. 2.) 
Colour chocolate-brown, the external half of the keels yellowish white, sternal area and legs reddish yellow. 
Keels rather large and horizontal. 1st, 2nd, and 3rd segments slightly narrower than the 4th and 5th ; 
1st with evenly convex anterior border; posterior border of keels oblique, not emarginate ; lateral angle 
rounded, not pointed. eels of 2nd and 3rd suboblong, with minute antero-lateral tooth ; keels of 4th 
larger, with lateral margin slightly irregular and more convex posterior border. Keels of pore-bearing 
segments with anterior angle widely convex, the posterior border in its external half running obliquely 
forwards and outwards up to the porous area, which is somewhat abruptly thickened and forms a 
tubercle-like excrescence; on the 12th and 13th the posterior border is markedly angled; on the 15th it 
is strongly notched just behind the pore-area; on the 17th the posterior angle is a little acute and 
projects backwards. On the poreless segments the anterior angles are widely rounded, the posterior 
border lightly convex, and the posterior angle mostly rectangular, The entire dorsal surface of the 
metazonites is roughened with irregular granulation, with three rows (the first indistinct) of larger, more 
definite granules 
Y2 
