470 Mr. E. I. Pocock on some new or 



CheJce granular and crested as in T. ecuadorensis ; liand 

 Avider than brachium; movable finger with 14 rows of teeth. 

 Pectinal teeth 17-18 



Total length 65 niillim., carapace 6, tail 37. 

 Loc. Loja, 2000 in. (P. 0. Sitnons) . 



Family Chactidae. 

 Genus MegacOKMUS, Karsch. 

 Megacornuis segmentatus^ sp. n. 



Colour a tolerably uniform reddish brown ; terga with traces 

 of three pale spots, one median and one at each lateral angle ; 

 legs yellow, variegated with deep brown. 



Closely allied to M. granosus, but differing in having the 

 shaft of the pectines very distinctly segmented, consisting of 

 an apical, a median, and two large basal sclerites. 



Pectinal teeth 4. 



Total length S'd millim. 



Loc. Atoyac in Vera Cruz (A. Dug^s). 



Genus Plesiochactas, nov. 



Allied to Megaconnus, Karsch, but with the carapace broad 

 and squarely truncate in front ; the stigmata elongate and 

 slit-like, not with tlie ends strongly curled round as in Mega- 

 cormus, and with distinct " fulcra " on the pectines. 



Type P. Dugesi, sp. n. 



Plesiochactas Dugesi, sp. n. 



Colour nearly black, varied with yellowish red ; terga with 

 a pair of large yellow spots on the posterior border ; coxaj 

 and legs yellowish red, the coxte clouded, the legs strongly 

 ringed with black. 



Carapace as long as caudal segment 1+2 + ^ of 3, a little 

 longer than fifth, coarsely granular; terga coarsely granular, 

 the posterior terga finely and closely granular as well ; 

 sterna and coatee completely smooth, densely punctured, the 

 last sterna only weakly granular, with a median and a pair of 

 lateral abbreviated crests. 



Tail with crests evenly and coarsely granular, the inter- 

 vening spaces sparsely granular, except on the upperside, 

 which has a densely granular median patch ; vesicle granular, 

 fusiform, elongate. 



Chelce with strongly granular crests, intervening spaces 

 sparsely but rather coarsely granular ; brachium with a few 



