RHINOCRICUS. 67 
Head punctured; median sulcus deep, interrupted only for a short distance mesially. Antenne short, 
slightly attenuate; second segment scarcely longer than wide, fifth nearly twice as wide as long, sixth 
narrower and not longer than the fifth, seventh about half the width of the fifth. irst tergite punctured, 
widely rounded laterally ; second with its inferior angle produced inferiorly, its lower horizontal area 
not transverse, scooped out. Anterior portion of remaining segments transversely sinuate in front, 
furnished behind dorsally with small anastomosing wart-like tubercles, which extend transversely across 
the segment from the level of the pores and encroach longitudinally upon the median portion ; the latter 
coriaceous with close-set punctures; posterior portion similarly coriaceous in front, the punctures 
becoming scattered posteriorly and leaving the hinder border smooth and polished; the infero-lateral 
ongitudinal striz of this portion not extending halfway up to the pore and absent upon the second, 
third, and fourth terga. Transverse sulcus weak dorsally but complete, except on the second and 
penultimate segments, and scarcely traceable upon the third and fourth. Scobine present, extending to 
the seventh segment from the end, consisting of a pair of semilunar or crescentic impressions close to the 
edge of the terga, separated by a space varying in different regions according to the size of the impressions, 
from two to four times their transverse diameter, or considerably more on the posterior segments. Anal 
segment: tergite with short, sharp, rectangular caudal process, not covering the summit of the valves, 
which have strongly compressed margins ; sternite very short, scarcely longer than the sternal area of the 
preceding segment, convex both longitudinally and transversely, and with its posterior border nearly 
straight and transverse. 
Number of segments 44. 
Total length 100 millim.; median width 11:5; width of first segment 9, of penultimate segment 7:5. 
Hab. Nicaragua, San Marcos (£. Burns). 
Differs from all the Central-American species known to me in the extreme shortness 
and longitudinal convexity of the anal sternite and the irregular tuberculation of the 
dorsal area of the anterior portion of the terga. 
13. Rhinocricus omiltema, sp. n. (Tab. VI. figg. 12 a-c.) 
Colour: segments uniformly black, not banded; legs and antenne yellow; head olivaceous, paler below. 
Head finely striolate; sulcus very deep just above the labral excision; eyes large and subcircular. 
Antenne not incrassate; sixth segment rather wider than long, about as wide as the fifth, seventh 
narrower than fifth; four sensory papilla on the last segment. Body long, slender: first segment 
wider than second, and as wide as the median. First tergite widely rounded laterally ; second with its 
infero-lateral edge projecting below. Remaining segments coriaceous, irregularly and weakly suleate 
longitudinally ; transverse sulcus becoming evanescent above the pore, replaced by a secondary sulcus 
rising in front of the pore and extending right over the dorsum of the segments; sides of segment 
obliquely sulcate in front of the transverse sulcus; the posterior portion longitudinally striate half- 
way up to the pore on the anterior segments; on the median and posterior segments the striw 
extend only a short distance above the bases of the legs; a short longitudinal sulcus visible behind the 
pore. Scobine present, extending to about the fifteenth segment from the end, consisting of a pair of 
crescentic pits close to the anterior edge of the segments, separated by a space which is equal to about 
three times their transverse diameter ; striate area relatively long and triangularly pointed behind. Anal 
segment: tergite produced into a relatively long caudal process which covers and slightly overlaps the 
summit of the valves ; valves with margins scarcely compressed ; sternite large, triangular. 
Number of segments 48. 
Total length 41 millim.; median width 3; width of first segment 3:3, of penultimate segment 2-3. 
Hab. Mexico, Omilteme in Guerrero (H. H. Smith). 
This species differs from the remaining species here described under Rhinocricus 
in three striking characteristics, namely: the structure of the phallopods in the male, 
K 2 
