Spiders from the Solomon Islands. 473 



Guinea &c. ascribed by Thorell to the genus Bathippus in 

 the exceptional length of the legs of the anterior pair. 



EUSTIROGNATHUS, gen. nov. 



Carapace almost as wide as long, head-region strongly 

 elevated, its lightly convex upper surface meeting the poste- 

 rior thoracic slope at an obtuse angle of about 135°: sides 

 of the thoracic portion about halfway above tiie lower edge 

 distinctly depressed ; ocular quadrangle longer than wide, 

 longer than half the carapace, a little wider in front than 

 behind. Eyes of second line about midway between those of 

 the first and third ; centres of anterior laterals on a level with 

 upper rims of anterior medians ; clypeus very narrow. 



Mandibles {^) of moderate length, diverging from the 

 base, with strongly geniculate outer anterior edge, then 

 converging and meeting, the inner or posterior extremity of the 

 fang-groove being produced into a broad lobate process which 

 meets that of the opposite side ; the mandibles thus circum- 

 scribe a central piriform space, through which the rostrum and 

 maxillae may be seen j they are furnished in front and ex- 

 ternally with a long smooth keel, running upwards from the 

 base of fang, and below internally with a crest beset with 

 stridulating-ridges ; fang short. 



MaxillcB much expanded distally, the antero-internal edge 

 strongly convex, the external border of the distal portion 

 strongly produced. Labium twice as long as wide. 



Sternum subcircular. 



Legs long and slender, 1, 3, 4, 2, third and fourth subequal, 

 second only a trifle shorter; patella and tibia of third a little 

 greater than those of fourth ; protarsus and tarsus of fourth 

 a little greater than tibia and patella of fourth ; all segments 

 of legs except tarsi spined. 



Abdomen more than twice as long as broad. 



According to Keyserling's tables of Australian Attidse 

 ('Die Arachniden,' ii. p. 1471 &c., 1883), this genus, neglecting 

 the peculiarity of the mandibles, which may be sexual, falls 

 alongside oi lona, Peckh. {Erasmia, Keys.), and Prostheclina; 

 but, judging from the structure of the carapace, it has no near 

 affinity with either. Tested by Mr. Peckham's tables (Tr. 

 Wisconsin Acad. vi. p. 265, 1885), it also falls under the 

 same heading as Zona. 



29. Eustirognathus oscitans, sp. n. 

 (Pi. XIX. figs. 11-116.) 



Colour. Carapace black, pale on the head, thoracic portion 

 furnished on each side with a broad silvery band, the two 



