102 DIPLOPODA. 
Hab. Costa Rica1, San José (Biolley *). 
The above-given diagnosis has been taken direct from Brolemann’s description. 
Karsch’s description taken from the type from Costa Rica furnishes no reason for 
doubting that Brélemann’s identification of his specimens was correct. 
This is evidently a very distinct species from the rest of the known Central- 
American Orthopori, especially in the form of the copulatory apparatus. Of the 
species known to me, the description seems to suggest similarity in certain particulars 
to OQ. striatulus, especially perhaps in the shape of the mandible in the male and the 
sculpturing of the posterior area of the terga. But in O. striatulus the infero-lateral 
portion of the first tergal plate is scarcely incurved and its anterior angle is obtuse and 
not produced. In the incurvature of the infero-lateral portion of the first tergal 
plate and its definition by a distinct ridge, as well as in the absence of pores from the 
fifth segment, similarity may be traced to O. teapensis from ‘Tabasco ; but the antero- 
inferior angle of the first plate is less produced in the latter and the copulatory 
apparatus is of quite a different form. 
12. Orthoporus ampussis. 
Spirostreptus ampussis, Karsch, Zeitschr. Ges. Naturw. (3) vi. pp. 438, 44 (1881) ". 
Colour black. 
Head smooth above, rugose below. First terqal plate more widely rounded laterally than in O. confragosus, 
with 4-5 oblique sulci. Segments deeply sulcate, the upper surface punctate posteriorly. Anal tergal 
plate rugose, angularly rounded, not surpassing the valves, which have the margins narrowly com- 
pressed. 
Number of segments and measurements unrecorded. 
Hab. Mexico, Puebla}. 
The description of this species furnishes no data by which it can be compared with 
other Mexican forms, 
13. Orthoporus feste. 
Plusioporus festé, Silvestri, Boll. Mus. Torino, xi. no. 254, p. 3 (1896) °. 
Colour reddish-black ; antenne and legs reddish or reddish-black. 
First tergal plate with its infero-lateral portion defined by a keel-like ridge and trisulcate beneath it ; 
the anterior angle acute, but, rounded, the posterior obtuse. Anterior segments laterally carinate. 
Dorsal surface of the segments very minutely punctulate; the sulcus deep. Pores beginning on 
the fifth segment. Anal tergal plate but little angled; anal valves marginate; sternal plate short, 
wide, rounded. 
Number of segments 49-54. 
Length from 60-90 millim., width from 4-7. 
Hab. Panama, Isthmus of Darien, Punta Sabana (festa '). 
This species was referred to the genus Plustoporus by Silvestri, but since only the 
female was known there appear to me to be no reasons for separating it generically 
