DESCRIPTION OF GENERA AND SPECIES. 233 



Legs: 1, 2, 4, 3; sufficiently pubescent upon tlie apical joints, which are blackish, or 

 in some sjiecimens a darkish yellow; without spines, but with long yellowish bristles; palps 

 coloi'ed and armored as legs; mandibles uniform in color with the liead, conical, strong, 

 slightly retreating, and overhung by the frontal eye space. 



Abdomen: An even oval; dorsum arched; color ashen gray; folium a light square of 

 reticulated j'ellow or cretaceous, occup}'ing the middle of the dorsum, marked at the corners 

 by four black spots, of which the two basal are more widely separated. In some specimens 

 an indistinct, interrupted double line of yellow passes along the middle of this folium, 

 and shapes itself upon the front in an indistinct lance headed figure. The impressed spots 

 are jirominent upon the dorsum ; the skin is covered with soft, short pubescence. The 

 venter, like the sides, is a light ashen color, the spinnerets, which are just beneath the 

 apical wall, being somewhat lighter in color. The epigynum (Fig. .5b) has a very slight, 

 short scapus, of uniform length. 



Male: Somewhat smaller than the female, 2.5 mm. long, and in general color and 

 markings resembles it. Cephalothorax bright orange; the head somewhat more pointed at 

 the face than the female ; the legs without any special clasping ajijiaratus, but with bristle- 

 like spines, more numerous and longer; the palps (Fig. 6a) rather stout, joints orange color, 

 except the digital, which is greatly distended, and colored as the feet. 



DiSTRiisuTio.v : Specimens have been taken as far southeast as Florida, southwest in 

 Texas, and as far to the northwest as Nebraska. (Marx Collection.) This would indicate 

 a wide distribution over the United States. 



No. 85. Singa variabilis Emehton. Plate XX, Figs. 11, 12, 13; PI. XIX, Fig. 7. 



1884. Singa variabilis, Emerton . . . . N. E. Ep., p. 332, xxxiv., 16. 

 1889. Singa variabilis, M.^RX ...... Catalogue, p. 550. 



Female: Total length, 4 mm.; abdomen, 2.75 mm. long by 1.75 umi. wide; cephalo- 

 thorax, 1.5 mm. long by l-f mm. wide. The individuals of this species, as may be 

 observed from the drawings on the plate, differ so greatly in color that it is hard to 

 determine the typical colors. The specimen of which description is made (Fig. 12) is, in 

 front, yellowish brown ; and for the abdomen a drab or cretaceous hue for the field, with 

 longitudinal markings of silvery white. Some of the specimens (Fig. 11) have the abdo- 

 men a uniform glossy black. These changes of color do not depend upon moulting stages, 

 but appear in adult individuals of both sexes. 



Cephalothorax : A lounded oval, high in the centre, from which the corselet slopes 

 sharply backward ; the fosse overhung by the abdomen ; the head rounded and erect above 

 the corselet; cephalic suture strongly marked; corselet grooves indistinct; color yellow, 

 mottled with splotches of brown ; sternum shield shape, glossy black ; sternal cones dis- 

 tinct ; flat in the centre, which is raised ; very little pubescence. Labium triangular, wide 

 at the base, more than half as high as the maxillse, which are rather rounded at the tip, 

 as broad as long; color, blackish brown at the bases, and lighter brown at the tips. 



Eyes: The entire eye space glo.ssy black; the ocular quad on a high eminence, 

 narrower in front than behind; longest at the sides; MF somewhat smaller than MR, and 

 separated by about 1.5 diameters, MR by about one diameter. Side eyes on tubercles ; 

 subequal, but MF apparently somewhat smaller than MR, divided by about or less than a 

 radius; separated from MF by a little more than the space which divides the latter; the 

 distance Ijetween SR and MR is greater than that between SF and MF; fi'ont row recurved, 

 rear row procurved; clypeus rather high, measured from MF to the margin, but the black 

 central eminence extends very close to the margin. 



Legs: 1, 2, 4, 3; short, stout, yellowish color, in harmony with the corselet; abundant 

 yellowish hairs, which are blackish upon the feet, and a few bristlelike spines; the palps 

 colored and armed as the legs; the mandibles stout, parallel, and not retreating backward. 



Abdomen: An oval, longer than broad; the dorsum arched; the base overhanging tlie 

 cephalothorax ; the spinnerets placed beneath the apical wall ; color greatly varying, from 

 silvery white, drab, and yellow to black, with brown longitudinal markings, or blackish 



