IN NEW BRITAIN, THE SOLOMON ISLANDS, LOYALTY ISLANDS, ETC. 119 



Measurements in millimetres. Total length of body 10"5 ; length of carapace (not 

 including eyes) 4, width 3'3 ; length of basal segment of mandible 7*2, of fang from 

 its basal angle 7"8, of palp 5-8, of 1st leg 16 5, of 2nd 12-8, of 3rd 148, of 4th 13'8. 



Loc. New Britain. Several male examples. 



In the shape and great length of its mandibles, of which the basal segment is 

 considerably longer than the carapace, this species resembles B. montrouzieri, Lucas 

 from New Caledonia (Rev. Mag. Zool., 1869, p. 208, pi. n. figs. 8—12) and B. mon- 

 trouzieri papuanus, Thorell (Ann. Mus. Genova, XVII. p. 526), of which the British 

 Museum possesses specimens from Aru Island and the Fly River, Papua. B. proboscideus, 

 however, may be at once recognised by the presence of a longish tooth at the base 

 of the fang, which is strongly angled; by the small size of the apical tooth on the 

 inner side of the basal segment, and by the concavity of the upper and convexity of 

 the lower side of the segment. 



GENUS. Plexippus (C. Koch), Thorell. 

 Plexippus stridulator, sp. n. 

 PI. XI. Figs. 16— 16 c. 

 Colour : carapace yellowish brown, the head region darker, redder, sometimes 

 a paler median band on the thoracic portion ; the region of the eyes clothed with 

 hairs of a rusty red, traces of hairs of the same colour visible here and there on 

 the thoracic portion, which like the area below the eyes is clothed with white hairs; 

 mandibles dark, metallic, with a clothing of long white hairs ; palpi and legs reddish 

 brown, the anterior two pairs with bluish metallic lustre, tarsus and distal half of 

 protarsus pale yellow ; maxillae and labium deep brown, sternum and coxae flavous ; 

 abdomen with a pale median dorsal band with border sinuous and set off with black 

 spots : sides of abdomen fuscous above, pale below, with a dark median ventral 

 stripe ; sides of abdomen clothed with snow-white hairs, intermixed with those of a 

 bronzy hue above. 



Carapace equal to length of patella and tibia of 2nd leg. Mandibles vertical, 

 shorter than carapace, diverging from the base, the inner distal angle at the base of 

 the fang produced into an elongate conical tooth ; the fang-groove armed in front 

 near the base with two spiniform teeth and behind with one long sharp spike and, 

 at the base of the fang, a small conical tooth ; on the posterior surface of the mandible 

 there is a submedian vertical series of about 12 short strong ridges; fang moderately 

 long, sinuous. Maxillae about twice as long as the labium, their distal portion 

 produced externally into a strong acute angle of about 70 degrees, the margin 

 between the angle and the scopulate oral margin straight ; on the upper surface of 

 the maxillae the serrula extends along the border to the external angle ; patella and 

 tarsus of palp subequal in length, tibia longer than either and armed externally and 

 'listally with a long straight spine. 



Legs: tibia of 1st thickly hairy below and armed with 2, 2. 2 long spines and 

 1 anterior distal spine; protarsus of 1st and 2nd with 2, 2 spines; tibia of 2nd 

 with 1 (posterior), 2, 2 spines below and 3 spines in front : patella of 1st without 

 spines, of 2nd with 1 anterior spine, of 3rd and 4th with 1, 1 spines; femora with 

 5 — 7 spines above ; tibia and protarsus of 3rd and 4th with many spines. 



