RHINOCRICUS. 63 
tergite widely rounded ; second with its infero-lateral edge produced in front into a rounded excrescence. 
Remaining segments striolate and punctulate; transverse sulcus absent on second segment, obsolete or 
almost obsolete dorsally on the others ; in the anterior fourth of the body deep and strongly pitted laterally 
up to the pore, the pits becoming gradually evanescent in the middle and posterior portions of the body ; 
a longitudinal groove behind the pore on the posterior segments; anterior portion of segments sparsely 
striolate. Scobine extending to about the fourth segment from the end, consisting of a pair of deep 
semicircular pits with raised floor close to the anterior edge of the segment and four or five diameters 
apart ; striolated area elongate, narrower than the impressions, less triangular than usual. Anal segment : 
tergite produced slightly beyond the summit of the valves, which have their margins deeply grooved ; 
sternite slightly acutely triangular. 
Copulatory organs and phallopods of male as shown in Tab. VI. figg. 3e, f. Number of segments 60-62. 
Length of 2 up to about 140 millim., width 13:5, of anterior tergite 9°5; length of ¢ 102 millim., 
width 10:5, 
Hab. Mexico, Omilteme and Amoquileca in Guerrero (//. H. Smith). 
5. Rhinocricus aposematus, sp.n. (Tab. VI. fig. 4 a-e.) 
$. Colour (in alcohol) a washed-out red, when fresh probably brilliant blood-red throughout, with the 
anterior and inferior areas of the segments paler ; legs and antenne red like the head and body. 
Antenne thick, clavate, third segment about as wide as long; the sixth much wider than long, and wider than 
the fifth, seventh also very wide. first segment nearly smooth; anterior portion of the others finely 
striolate tranversely, median and posterior portions finely striolate and coriaceous longitudinally. 
Transverse sulcus obsolete dorsally on the second segment, very weak upon the third and fourth, 
complete but weak upon the dorsum of all the segments, and evanescent at the posterior end of the body ; 
the longitudinal pore-suleus present. Scobinw extending from the eighth to about the sixth segment 
from the end; the pits oval, with the floor elevated, less than their transverse diameter from the anterior 
edge of the segments and separated by a space equalling about four times that diameter ; at the posterior 
end, where they dwindle in size, the distance becomes relatively greater; the striate area triangular, 
narrowed behind, as wide in front as the impression. Anal segment: tergite with very short but 
distinct caudal process, transversely grooved at its base; valves with lightly compressed margins, their 
summits projecting considerably beyond the apex of the caudal process; sternite widely and convexly 
rounded, with a transverse groove in its anterior half. Leys mostly nearly hairless beneath, a bristle on 
the cox and two or three spines on the tarsus; first and second legs, and in a lesser degree the third, 
with all the segments bristly below. 
Copulatory apparatus and phallopods as in Tab. VI. figg. 4a—-e. Number of segments 44. 
Total length 140 millim.; median width 15; width of first segment 12, of penultimate segment 11 millim. 
Hab. Costa Rica, Santa Clara (J. Tristan). 
6. Rhinocricus tristani, sp.n. (Tab. VI. figg. 5 a-d.) 
3. Nearly allied to the foregoing, but differently coloured and much smaller. 
Colour a darker red above, the median area of the segments from the dorsum to halfway below the pore deep 
olive-green, but the green gradually narrowing away below the pore, leaving the inferior portion of the 
segments yellowish-red; first segment green in the middle, bordered with red; upper half of head 
olivaceous ; antennee and legs clear yellow. 
Antenne thicker than in 2, aposematus ; the second segment scarcely longer than wide, the fifth and sixth at 
least twice as wide as long; fifth and sixth granular. Segments sculptured and sulcate as in that species. 
Scobine also much the same, but the groove defining the elliptical impression incomplete in front and the 
floor more convex. Anal segment: tergite without groove at base of caudal process, which is apparently 
shorter on account of the lesser emargination of the two sides of the border, which converge to form the 
angle; margin of valves less compressed, their summits not quite covered by the tip of the caudal process ; 
sternite very distinctly and obtusely angular, without transverse groove in its anterior half, 
