Mr. A. White on a new genus of Arachnida. 179 



XXII. — Description of a new Genus of Arachnida, with Notes on 

 two other species of Spiders. By Adam White, M.E.S., As- 

 sistant in the Zoological Department of the British Museum. 



[With a Plate.] 



Family Attid^:. 



Deineresus, White. Cephalothorax ovato-rotundate, highly 

 convex, especially in front. Eyes eight : four in front, the middle 

 two very large and prominent ; the lateral eyes not half the size 

 of the middle two, and projecting ; these eyes are separated by 

 slight emarginations, the notch between the lateral and middle 

 eyes being wider than between the two middle eyes ; the fifth 

 and sixth eyes distant from each other, very small, the space be- 

 tween them and the lateral eyes shorter than between them and 

 the posterior eyes ; seventh and eighth eyes of the same size as 

 the lateral front eyes, the cephalothorax bulges over them. 



Chelicera very large, swollen, attenuated at the end, with a 

 sharpish ridge on the inside ending in a spine ; hook nearly as 

 long as the rest of the chelicere, much bent, the point also hooked 

 with a strong tooth beneath it. 



Maxillae thick, longer than wide, excavated on the outside, 

 entire at the end, and strongly tufted with hairs ; the palpi with 

 the second joint long and bent, the third joint slightly bent, 

 scarcely half the length of the fourth, which is also bent, and has 

 a spine at the end, the fifth joint thick, short, blunt at the end 

 and very hairy. 



First pair of legs the longest, femoral, genual, and tibial joints 

 thickish ; the three hind pairs nearly equal in length ; the second 

 and third with the femoral, genual, and tibial joints somewhat 

 thickened. 



This remarkable spider belongs to the group Attida, and in 

 the matter of chelicera far surpasses even Toxeus maxillosus, 

 Koch, Arachniden, xiii. 19. t. 436. f. 1090. I have only seen 

 one specimen, which is a male. 



Deineresus Walckenaerii, White. PL II. fig. 4. Cephalothorax 

 and legs of a deep shining brownish black ; the eyes pale, the 

 front eyes with hairs at the base. Abdomen small, subferruginous, 

 with short silky hairs most visible on the sides, four depressed 

 points on the back ; spinnerets prominent. Legs veiy hairy on 

 the under side, a few spines among the hairs. 



Total length 10 lines. Length of first pair of legs rather more 

 than 10 lines ; of second pair 8 J lines ; of third pair 8 lines ; of 

 fourth pair 8^ lines. 



Hab. Celebes. British Museum. Presented by Dr. Knapp of 

 Edinburgh. 



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