1912] Chilopods and Diplopods 161 
All segments striate beneath. Each segment from the fifth to the 
antepenult inclusive with four carinz, a dorsal carina each side of median 
line and one farther laterad on each side, the latter bearing the pore. 
Legs sparsely armed with spinescent bristles. First pair in male 
reduced, composed of six articles normally armed. 
Type: Titsona sima sp. nov. 
Evidently close to Paiteya, the type of which is likewise a 
Californian species. 
Titsona sima sp. nov. 
General color caudad of fifth segment dark brown, the caudal 
portion of each segment light brown. First dorsal plate light brown, a 
dark stripe parallel with but a little removed from the caudal and the 
cephalic border, the two stripes confluent at the sides of plate. Second 
to fourth segments light brown, each with a narrow transverse stripe 
of dark brown and especially laterally with a network of lines of same 
color, the proportion of dark larger the more caudal the segment. 
Head light brown, darker adjacent to first dorsal plate; on clypeus a 
square with upper side missing outlined in dark brown and immediately 
above this a subelliptical outline in same color with dorsal and ventral 
ends acutely angular. A pair of somewhat confluent brown spots 
in line from the brown about each eye ventro-mesad toward lower 
part of elliptical outline of front. Legs very pale. 
Ocelli in a single row, 5-7 in number, black, uniform; the series 
parallel with margin of first dorsal plate which partly covers it on 
caudal side. 
Antenne short, strongly clavate; the fifth and sixth joints much. 
stouter than the others, the fifth strongly enlarged from its base distad, 
the sixth more uniform and broadest proximad. Hairs more dense 
distad as usual. (See Pl. X, fig. 5). 
Stipites of gnathochilarium inclusive of processes nearly four times. 
as long as greatest width. Mentum abruptly narrowed at distal end, 
wider at base than the median length approximately in ratio of seven 
to six. A semi-circular impression on proximal portion deeply impressed, 
the concavity directed distad. Promentum narrowly triangular. 
Lamine linguales narrowed to an acute angle proximally, about three 
times as long as greatest width. 
First dorsal plate very large, embracing caudal portion of head. 
mesally, its lateral wings separated from sides of head by a space into 
which the antennze may be bent back. Anterior margin widely weakly 
concave, laterally running obliquely caudo-ventrad. Caudal margin 
nearly evenly convexly rounded mesally, lateral portion of plate bent 
ventrad and somewhat caudad and then mesad beneath. Caudal 
portion of plate more constricted than the anterior. On each side above 
lateral angle are several striae extending from caudal margin cephalad. 
Next three segments striate beneath. Fifth and subsequent seg- 
ments with prozonites striate throughout, the main division of segment 
striate beneath and dorsad only about half way to pore-bearing swelling 
