ORTHOPORWS. 103 
from Orthoporus. Silvestri regarded the presence of pores on the fifth segment as 
a generic feature; but I entirely agree with Brélemann’s view that it has merely a 
specific significance, so far, at all events, as the Central-American species of Spiro- 
streptide are concerned. 
Judging from the presence of pores upon the fifth segment and of a cariniform 
ridge on the lateral portion of the first tergal plate, O. feste would fall under 
Section “5” of the first analytical key given above. Of the two species under this 
heading, it apparently approaches O. chiriquensis in the form of the anal segment, 
and the two may be identical. Silvestri, however, makes no mention of the marked 
inflection of the inferior portion of the first tergal plate which is so noticeable in both 
sexes of O. chiriquensis, and further states that the head of O. feste is marked with a 
pair of tolerably deep circular foveze near the antenne, which are not present in 
O. chiriquensis. 
14. Orthoporus rodriguezi. 
Spirostreptus rodriguezit, Brélemann, Mém. Soc. Zool. France, xiii. p. 104, t. 6. fig. 47, and t. 7. 
fig. 58 (1900) °. 
Spirostreptus (Scaphiostreptus) rodriguezi, Brolemann, Bull. Soc. Zool. France, xxix. p.190 (1904) *; 
Ann. Soc. Ent. France, xxiv. p. 862 (1905) *. 
According to Brélemann’s latest remarks upon this species it may be distinguished from O. typotopyge by the 
absence of pores upon the fifth segment, by being much smaller and slenderer, by having the posterior 
area of the segments less striolate and more visibly punctured—not because the punctures are coarser, but 
because the areas between them are less sculptured,—and by having the depression that defines the 
margins of the anal valves wider and deeper. A further difference is furnished by the shape of the distal 
portion of the posterior lamina of the coleopod, which has its inner angle obliquely cut away, and its 
external edge bearing a short but slender and subcylindrical spiniform process, which is divided obliquely 
upwards and outwards. ‘This process is much thinner than that of O. palmensis, 
Number of segments 65-68. 
Length up to 80 millim., width not more than 4. 
Hab, Guatema.a (Rodriguez 3). 
Subsp. coriaceus, 
Spirostreptus rodriguezi, var. coriaceus, Brélemann, Mém. Soc. Zool. France, xii. p. 106 (1900) *. 
This subspecies was based upon a single female example, with the same history as the typical form, but 
_ differing from it in being markedly more rugose, in having the anterior border of the lateral portion of 
the first tergal plate lightly concave and the angle rectangular instead of obtusely angled, with the sulci 
above it weaker. The body, finally, is shorter and thicker. 
Number of segments 63. 
Length 60 millim.; width 4°30, 
15. Orthoporus omalopyge. 
Spirostreptus (Scaphiostreptus) omalopyge, Brélemann, Ann. Soc. Ent. France, Ixxiv. p. 365, t. 9. 
fig. 19 (1905) °. 
In possessing pores upon the fifth segment this species falls into the same category as O. typotopyge and 
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