Myriapoda of West Africa. 27 



Habitat. — One male and a portion of another, and two females, 

 from "Congo, Jan. 2." 



This species is distinct from P. gracilis C. Koch, in its larger size, 

 smaller caringe, faint transverse sulcus of posterior subsegments, the 

 fringes of the two penultimate joints of the legs, the structure of 

 the fourth pair of legs, male genitalia, and in having no row of 

 granules between the subsegments; from P. Liberiensis Peters, in 

 having all the carinse posteriorly pointed, the posterior margin of 

 the first segment straight, the yellow markings, and the smaller 

 size ; from P. ornatus Peters, in the straight posterior margin of 

 the first segment, anterior segments not noticeably directed for- 

 ward, pores on the lateral surfaces of the carinas, and much smaller 

 size. 



2. Alloporus 1)ipiinctatiis, sp. n. 



Plate II, figs. 15, 16. 



Body cylindrical, slightly constricted anteriorly, the fourth segment nar- 

 rowest ; last six or seven segments rapidly decreasing. 



Covered portion of epicraniuin with fine, hranching, longitudinal striations, 

 the striated area twice as wide on the ends as in the middle, where it is bisected 

 by a prolongation of the vertex sulcus. 



Vertex smootli or with very fine irregular longitudinal striae, the median 

 sulcus obsolete, but the suture distinct, meeting the rather obscure intra- 

 ocular suture in a deep foveola. 



Clypeus smooth above, wrinkled below, near the middle a broad depression ; 

 upper row of two bristle-bearing punctations, one over each end of the labral 

 emargination ; lower row of seven or eight smaller punctations on each side 

 of, and five behind the excavation. 



Labrum with a moderate excavation and three well-defined, though blunt 

 teeth. 



Eyes pointed-oval, distant from each other by scarcely the transverse diame- 

 ter of an eye ; ocelli of righ t ey e arranged : ll-j-10-f-9-f-8-l-7-|-4 = 49, of 

 left, ll-fl0 + 9 + 8-f7-f4-f-2 = 51. 



Antennae 6.5 mm. long, second joint longest, the third, fourth, fifth, and the 

 sixth and seventh taken together, about equal in length. 



Mandibulary stipe with the exposed surface subrectangular in outline, 

 convex, with raised margin ; anterior inferior corner somewhat produced. 



Masticatory plate triangular, twice as long as broad, the surface rough with 

 short spines ; margin raised ; at the broad end a deep groove. 



Mandibulary tooth oblong, more than twice as long as broad, the end rounded. 



Dentate lamella with five rounded teeth. 



Pectinate lamellae of eleven complete rows of spines, and one short row. 



Mentum about sfx times as wide as long ; anteror margin broadly sinuate ; 

 anterior corners rounded ; lateral margins posteriorly converging. 



