NO. 1168. THE GENUS PACHYBOLUS— COOK. 661 



Copiilatory legs resembling* those of P. hracliystermis in the very 

 short, broad, truncate, or emarginate median process of the sternum; 

 anterior lamiuoe deeply excised on their mesial margins, and also nar- 

 rower than in P. hr achy ster mis. Flagella with various folds and wrin- 

 kles some distance below the apex, which is nearly simple, and with a 

 tooth-like process beh)w to protect the large opening of the seminal 

 duct. 



Seven male specimens of this species are in the Berlin Museum, being 

 Nos. 20r)0, Kamerun (F. Braun), 2041, Kamerun (Dr. Weissenborn), and 

 13i.*.)-1325, Kribi (Lieutenant Morgen). The four Kamerun specimens 

 haver>2 segments each, while the three individuals from Kribi have 51. 

 The type is one of these last, IS'o. 1324. 



The present species can hardly be the same as any of the older names, 

 since all of these were founded on material from farther up the coast. 

 The affinity is distinctly with the Congo Valley species, but P. hrachy- 

 stcrims (lifters strikingly in the form of the tiagellum, and macrostermis 

 is scarcely less different in tliis respect and has, moreover, the much 

 longer sternum. 



PACHYBOLUS BRACHYSTERNUS, new species. 

 (Plate LI, figs. 2a-2d.) 



Type.—^o. 772, U.S.N.M. 



Locality, — Congo. 



Length, 130 mm,; width of male, 14.8 mm. at segment 6; number of 

 segments, 50 to 51. 



Color of alcoholic specimens dark brown on posterior half of eacli 

 ring, bright vermilion on the anterior, lighter below, but the red color 

 more pronounced veil trad than in tlie other species. 



Copulatory legs with sternum sliort, broad, and truncate or emar- 

 ginate, much as in P. excisus ; anterior laminjie slightly emarginate on 

 the mesial edge; flagella distaliy strongly expanded and enlarged, very 

 irregular in shape, being made up of numerous plates, ridges, and folds 

 much more numerous and complicated than in the otlier species. 



Two male and one female specimens were collected by the Kev. .1. H. 

 Camp in the Congo Free State. 



One male and the female have 50 segments, the other male 51. The 

 female, which may possibly notlielong here, is strikingly morerobustand 

 darker in color than the males, which are closely similar to each other. 

 Tliey are the smallest and most slender known members of the genus, 

 though the difference is slight. 



The legs of the female are distinctly shorter and more slender than 

 those of the male, and the body retains its width to near the end, the 

 anterior four or five segments being, however, slightly wider than any 

 of the others, the swollen sixth and seventh segments of the male 

 rendering the dillference in liabit still more striking. 



