Occasional Papers of the Museum of Zoology 19 



distance from each pore to the corresponding caudoectal angle of 

 the coxosternum. Claw of palpus large, completely pectinate. 



Basal plate wide at base, strongly narrowed forward. Proster- 

 num broad, a little less than once and a half times wider than long 

 (nearly 1.4:1); anterior margin unarmed. Femuroid of pre- 

 hensors armed at distal end within with a short blunt tooth, the 

 other joints unarmed. Claws of prehensors when closed extending 

 beyond front margin of head, attaining or nearly attaining the 

 distal end of the first antennal article (Plate III, Fig. 13). 



Tergites bisulcate. Last tergite large, a little broader than 

 long (about as 14:13), shield-shaped, the sides being convex and 

 converging caudad to an obtuse or rounded point. 



Ventral pores absent from first tergite; present without break 

 on sternites from second to antepenult inclusive; pore area circular 

 and undivided in all cases. 



Last ventral plate broad, sides converging caudad, posterior 

 angles rounded and caudal margin widely convex. 



Last legs composed of the usual seven joints. Coxopleurae 

 each with two heterogeneous or branched glands. Anal legs 

 alike in stoutness and pilosity in the two sexes. 



Pairs of legs in the male, fifty-three; in the female, fifty-five. 



Length, up to 45 mm. 



British Guiana, Dunoon: Labba Creek sand hills, July 27; 

 clay jungle by first landing on Labba Creek, August 12; sand- 

 hill forest, August 14, 17, 18, 22, 24, 27, September 4; east trail 

 along river September 2, 1914; F. M. Gaige. Many specimens 

 collected under leaves and logs, in rotten wood and damp earth, 

 etc. Type, M.C.Z., 2182. 



This species seems to be in most features very close to A . geayi 

 Brolemann and Ribaut' the types of which were taken on the 



^ Xouvelles Archives du Museum d'Hisloirc Xalurclle, Ser. 5, IV (191 2), 

 108, Figs. 24-32. 



