500 ME. R. I. POCOCK OX THE ARACHXIDS COLLECTED [June 21, 



and patellae of the legs, are blotched with black, and the lower 

 surface of the tail has a median dark line and a pair of fuscous 

 patches on each side of it. 



This species, the type and only known representative of the 

 genus Fseudobuthus, may be compared with the type and only 

 known species of the genus Titi/obutkxts as follows : — 



a. Tesic-le of tail smooth and piiuctiired below, tooth below aouleus small ; 



.'ith and •1th segments of tail at most weakly pranular below, not crested ; last 

 abdominal steruite not crested ; 2nd caudal segment with median lateral 

 crest almost complete ; brachiiim of chela and homologous segment of legs 

 (patella) not crested ; densely variegated. 



Titi/ohiifhus haroni (Poc). Madagascar. 



b. Vesicle of tail granular below, tooth long ; 4th aud .5lh segments of Uiil and 



last abdominal segment distinctly crested below, brachium of chela and 

 patella of legs also crested : 2nd caudal segment without median lateral 

 crest ; prevailing colour yellow or red, weakly infuscate. 



Fseudobuthus dentatus (Karsch). 



Genus Archisometbtjs Kraepeliu. 

 Archisometbus burdoi (Simon). 



Isometrus burdoi, Simon, Bull. Soc. Ent. Belg. 1882, p. Iviii ; 

 Pocock, Journ. Linn. Soc, Zool. xxiii. p. 448, pi. xi. fig. 5 (1890). 

 Loc. Voi. 

 ■ Previously known from Lake Nyassa, Kilimanjaro, &c. 



Order AEANE.E (Spiders). 

 Family TheraphosiDjE. 

 Subfamily HARPACTiRiif^. 

 HarpactirincB, Pocock, Proc. Zool. Soc. 1897, p. 748. 



Genus Eucratoscelus, nov. 



Allied to Pterinochilus, but differing in having the legs of the 4th 

 pair much longer than those of the 1st, the patella and tibia of the 

 4th being also much longer than those of the 1st ; the tibia being 

 A'ery stout and hairy, its width exceeding a third of its length and 

 being at least as wide as the distal end of the femtir. In Pterino- 

 chilus, on the contrary, the 4th leg is only a little longer than the 

 1st, with patella and tibia not longer (? always shorter) than those 

 of the 1st, the tibia itself being normally hairy, slender, cylindrical, 

 and narrower than the femur. 



Type, E. lomjicejis. 



Eucratoscelus loxgiceps, sp. n. 



Colour. Carapace and limbs covered with a clothing of short 

 greyish-brown hairs, the setae reddish brown, the lines on the legs 

 paler ; distinct whitish tufts or bands at the extremities of the 

 femora, patellae, tibiae, and protarsi ; abdomen a deep chocolate- 

 brown, with reddish bristles ; sternum and coxae blackish, with 

 greyish hairs. 



