June, i93n.] Petruxkevitch : Orchestina saltitaxs. 



159 



and third pair of legs, very high (figs, i, 2, 8 and 9). Chelicera slender. Max- 

 illary plates almost parallel, with short scopula at apical quarter. Lip wider 

 than long, its shape difficult to see. Sternum slightly longer than wide, emar- 

 ginate in front, cordiform, narrowly produced between the hind coxae (fig. 3) 

 and very convex (fig. 8). In this connection I should like to point out that 

 figure I is a reproduction of the original figure which I published in 1910 and 

 represents the spider in a position in which its back is considerably inclined 

 toward the observer. After the legs of both sides have been removed by a cut 

 between the coxae and trochanteres, fig. 8 was drawn with the aid of the draw- 

 ing apparatus and represents the exact profile of the cephalothorax. From an 

 examination of this figure it will appear that the carapace is highest between 

 the second and third coxae and that in front of the first coxae the carapace is 

 considerably extended downward thus forming a rather high clypeus. It will 

 also be seen that the convexity of the sternum is greatest in the region of the 

 second coxae. The carapace slopes therefore more gently forward and the 

 sternum backward. The eyegroup surrounded by black pigment (figs. 2, 8. and 

 9) is composed of six eyes, all nocturnal and grayish in color. The middle 

 eyes which are probably the posterior median eyes are larger than the side 

 eyes. From above they appear as ovals, but viewed from in front they have 

 the shape of a somewhat irregular circle. The clypeus is about two and a 

 half times as high as the diameter of the middle eyes. Abdomen ovoid, 

 higher than long (fig. i). Anterior spinnerets slightly heavier than posterior 

 ones. Legs slender II-I-I\'-III, first coxae wide apart (fig. 3). Hind femora 

 considerably dilated, being only 3.2 times as long as their width in middle 

 (fig. 6). Measurements of legs in millimeters: 



Feet with onychium. Claws two, with powerful curved teeth at base (fig. 

 7), fine teeth in middle third and smooth at apical third. Palpi heavy, with 

 very large bulb (fig. 5). Tibia much distended. Tarso-mctatarsus spoon- 

 shaped, half as long as the width of the bulb. Both figs. 4 and 5 were drawn 

 after the palpi were removed, cleared in oil and preserved as permanent micro- 

 scopic preparations. The figures Sre easily understood, as they supplement 

 each other, the one giving a sideview of the entire palpus less its co.xa. the 

 other a front view of the bulb and tarso-metatarsus. The embolus is long and 

 thin and is cuned outward. Inside the bulb the small sperm receptacle may 

 be seen close to its base, and the long sperm duct forming a loop in its middle. 

 The hair covering the body and appendages is of two types: simple hair of 

 various length attaining greatest dimensions on the abdomen, and minutely 

 plumose hair found only on the legs and palpi. 



