166 AMEKICAN SPIDERS AND THEIR SPINNINGXV'ORK. 



Eyes: Ocular (juad on a rounded eminence, and nearly a square in form, but widest 

 in front (Fig. 751; eyes not greatly different in size, but MR apjiear somewhat the larger; 

 MF sejiarated by about 1.5 to 2 diameters, and MR about l.r> or a little less; the side eyes 

 on slight tubercles; separated Ijy al>out a radius; SF somewhat larger than SR; MF sepa- 

 rated from SF by about the area of the former, or 1.5 the dividing interval thereof; SR 

 separated from MR by at least 1.3 the space between SF and MF; clypeus height about 1.5 

 diameter MF; the front row is almost aligned, the rear row longer and procurved. 



Legs : Uniform yellow ; sufficiently stout, especially at the femora ; armed tolerably 

 freely with bristles and sparingly with long, thin, yellow spines ; palps colored and armed 

 as legs; mandibles conical, rather long, yellow, and flecked with yellowish brown. 



Abdomen; Triangular ovate, the base rounded, high, and overhanging the coreelet ; the 

 dorsum arched to the distal spinnerets; there are no shoulder humps, but across the base 

 the dorsum is widened, forming from that point toward the apex an isosceles triangle, of 

 which the iield is white, and the folium a similar triangle of black, mottled with white 

 spots ; a semicircular patch of black marks the upper part of the base, on which are several 

 transverse curved rows of white sjiots, from the centre of which issue bristlelike hairs; 

 similar liairs are distributed over the dorsal iield ; the whole surface of the abdomen is 

 beautifully reticulated; the sides are white, as is also the venter; the spinnerets are amber 

 yelluw, surrounded at the base with an irregular border of black. The epigynum (Fig. Tc) 

 has the general characteristics of that of E. miniata (scutulata), the scapus being long, 

 though- gi-eatly convoluted, sometimes wrinkled, of uniform width throughout, terminating 

 in a deep wide bowl ; the whole light yellow ; the portulse on either side are rounded and 

 hollow bowls of glossy dark brown, open tow-ard the genital cleft, toward which also they 

 narrow ; at the part next the scapus and on either side thereof issues a stout, curved liorn 

 of similar folor and character. 



M.\le: Plate VI., Fig. 12. Resembles the female in color and substantially in markings; 

 the cephalothorax is cordate, indented at the base, where it is relatively wider than the 

 female, and narrower at the face ; the cephalothorax is smooth and glossy ; the fosse a 

 longitudinal indented slit; the legs are uniform yellow iu color, without any special clasping 

 apparatus, and with only a few long, strong yellowish brown spines upon the tip of legs-I 

 and II, which ai'e arranged in about four row's, both above and beneath ; the maxillw are 

 relatively longer and feebler than in the female, being much narrower at the tips and co^i- 

 cave on the front. The ocular (juad is quite prominent, much projecting in front, where it 

 is decidedly wider than behind, the front eyes being upon black bases, the side eyes upon 

 tubercles; SF somewhat larger than SR. The humeral joint of the palps is long, the radial 

 and cubital joints short; the digital rounded; the cymbium yellow, covered with bristles, 

 with two long, strong, curved spines thereon ; the embolus much curved. (Fig. 12a.) Length 

 of abdomen, 3 mm. ; cephalothorax about the same. The abdomen is a long oval, narrow at 

 the apex, the folium being black, broadest at the base, where there are two circular spots 

 like eyes in the midst of the black. 



Distribution : Santa Rosa, Cal. (The Marx Collection.) 



No. 25. Epeira Theisii W.\uki:n.\eu. Plate VI, Figs. 8, 9. 



1841. Epeira Thein, Wallkex.\ek . . . Ins. Apt., ii., p. 53, pi. xviii., 4. 



1847. Epeira mangarcm, W.vlckex.ver . Ins. Apt., iv., p. 469. 



1863. Epeira Oaxacensis, Keyserlixg . Jveuer Orbit Sitz. d. Isis, p. 121, pi. v., 15-18. 



1871. Epeira viangareva, Koch, L. . . Arach. Austral., p. 85, pi. vii., 4, 5. 



1877. Epeira mangareva, Thorei.l . . . Studi, I., Ragni di Selebes, p. 395. 



1878. Epeira triangulifera, Thoreli. . . Studi, II., Riigni di .\mboina, i'. 65. 

 1878. Epeira maiif/areva, Thorell . . . Ibid., p. 65. 



1881. Epeira Theisii, Thorell Studi, III., Rag. Melesi e Pa])uani. Principal form 



E. Theisii, and varieties E. niangiireva and E. 

 triangulifera. 



1889. Epeira Thcis, ^I.\R.\ Catalogue, \>. 548. 



