46 bulletin: museum of comparative zoology. 



Grammostola chalcothrix/ sp. nov. 

 Plate 3, fig. 5-7. 



Type.— M. C. Z. 41. d". Argentina: Rosario. W. M. Davis. 



Paratypc.— M. C.Z. 42. d^. Argentina: Rosario. W.M.Davis. 



Integument of cephalothorax, legs, and palpi excepting the coxae 

 ventrally very dark chestnut; that of chelicerae black. Pubescence 

 of cephalothorax and legs dark brown of bronze or golden lustre; the 

 bristle-free streaks on joints above very inconspicuous, not contrasting 

 in color of pubescence but only through absence of the bristles. 

 Bristles of legs dark brown proximally, lighter distad. Joints of legs 

 with the usual fringe of light hairs across distal ends above; femora 

 greyish ventrally; pubescence of coxae also with much grey ventrally. 

 Abdomen with long bristles dorsally and laterally and shorter ones 

 ventrally of golden yellow color excepting for their darker bases. 



Eye-tubercle convex, at middle strongly elevated, vertical in front 

 and steeply slanting behind. Ocular area wider than long in ratio 

 45: 25; anterior and posterior, eye-rows equal or nearly so. Anterior 

 row of eyes as seen from above considerably, procurved, a line tangent 

 to anterior edges of the medians passing somewhat caudad of middle 

 of surface of laterals. In anterior view a line tangent to lower edges 

 of medians passes well above lateral eyes. Anterior median eyes with 

 diameter equal to the long diameter of the laterals; their radius or 

 but little more apart and very nearly the same distance from the 

 laterals. Posterior lateral eyes smaller than the anterior laterals 

 their diameters being in ratio of about 5: 6; four fifths their diameter 

 from the anterior laterals. Posterior median eyes with long axis 

 equal to that of the laterals to which they are nmch nearer than to the 

 anterior medians. 



Stridulating spines on coxa I brown, small, slender, distinctly clavate 

 (Plate 3, fig. 6); very numerous, being closely crowded in a large 

 scopula-like area at the distal end above the suture and in a similar 

 area below it. The spines on coxa of palp in a similar large scopuliform 

 patch at distal end. 



Metatarsus of leg I in the male curved; scopulate to base or very 

 nearly so; shorter than the tibia. Processes of tibia I divergent; 

 superior one much the shorter, straight, narrowed toward apex, a 

 stout spine springing from base of its ectal edge as usual but this 



1 xaXKos, bronze, Spc'f, hair. 



