166 AMEEICAN SPIDERS AND THEIR SPINNINGWORK. 



Eves: Ocular quad on a rounded eminence, and nearly a square in form, but widest 

 in front (Fig. 7b); eyes not gi'eatly different in size, but MR appear somewhat the larger; 

 MF separated by about 1.5 to 2 diameters, and MR about 1.5 or a little less; the side eyes 

 <jn slight tubercles; separated by aliout 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; dypeus height about 1.5 

 diameter IMF; 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. 



Abdomex: Triangular ovate, the base rounded, high, and overhanging the corselet; 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 ajiex an isosceles triangle, of 

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

 spots; a semicircular patch of T)lack marks the upjper part of the base, on which are several 

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

 similar hairs are distributed over the dorsal field; the whole surface of the abdomen is 

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

 yellow, surrounded at the base with an irregular border of black. The epigynum (Fig. 7c) 

 has the general chai'acteristics of that of E. miniata (scutulata), the scapus being long, 

 though greatly convoluted, sometimes wrinkled, of uniform width throughout, terminating 

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

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

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

 of similar color and character. 



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

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

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

 longitudinal indented slit; the legs are uniform yellow in color, without any special t'lasping 

 apparatus, and with only a few long, strong yellowish brown siiines upon the tip of legs-1 

 and II, which are arranged in about four rows, both above and beneath ; the maxilla; are 

 relatively longer and feebler than in the female, being much narrower at the tips and con- 

 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. ; cepbalothorax about the same. The abdomen is a long oval, narrow at 

 the apex, the folium being black, broadest at the base, -nhere there are two circular sjiots 

 like eyes in the midst of the black. 



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



No. 25. Epeira Theisii W.vukenaeh. Plate VI, Figs. 8, 9. 



1841. Epeira Theis, Walckexaer . . . Ins. Apt., ii.. p. 53, pi. xviii., 4. 



1847. Epeira mangareva, Walckexaer . Ins. Apt., iv., p. 469. 



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



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



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



1878. Epeira Iriangulifera, Tuorell . . Studi, II., Ragni di .\mboina, p. 65. 

 1878. Epeira mangareva, Thorell . . . Ibid., p. 65. 



1881. Epeirn. Theisii, Thorell Studi, III., Rag. Jlelesi e Papnani. Principal form 



E. Theisii, and varieties E. mangareva and E. 

 triangulifera. 



1889. Epeira Theix, Marx ..,,,. Catalogue, p. 548. 



