210 AMERICAN SPIDERS AND THEIR SPINNINGWORK. 



the clypeus to MR; the forehead is divided at the median into two rounded humps; color 

 glossy brown, with short grayish yellow pubescence. Sternum an elongated shield shape, 

 decidedly longer than wide ; surface somewhat rugose, blackish to blackish brown, with 

 lighter touches of yellow in the middle ; slight pubescence, glossy. Labium subtriangular, 

 about half the height of maxillae ; maxillee as wide as or wider than long, obtusely trian- 

 gular at the tips, which are inclined toward one another. 



Eyes: Ocular quad on a rounded eminence; blackish brown in color, much wider 

 behind than in front, the length not greater than the rear width ; MF slightly larger than 

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

 about equal in size, scarcely contingent; distance between SF and MF very great, about 

 three times the area of the latter, or four to five times the intervening space; clypeus low, 

 the ocular quad touching its margin ; IMF removed by scarcely a diameter therefi'om ; front 

 row slightly recurved, rear row is almost aligned, scarcely procurved. 



Legs: 1, 4, 2, 3; short, stout, bright glossy brown in color, with dark apical annuli 

 which almost cover some of the joints; patellae wide; tibiae short; pubescence yellowish and 

 blackish bristles and hair, but no spines ; palps armored as legs, almost black ; mandibles 

 conical, wide at the base, where they are much arched, relatively much attenuated at the 

 apex; color glossy bright brown. 



Abdomen : An elongated oval, wider than long, the dorsum and dorsal field uniform 

 yellow, the four ordinary muscular pits forming a prominent quadrilateral in the centre ; 

 around the margin are rows of dimjiles resembling the central ones, being nine in number, 

 on either side of a strong spine which extends laterally and upward from the middle of 

 the margin ; this spine is covered with short blackish hairs, whose strong bases give it a 

 rugose appearance ; it is tipped with bright yellowish brown ; sides and apex brown, 

 strongly contrasting with the pale yellow of the dorsal field, mottled here and there with 

 round yellow spots and with dimples scattered over tlie rugose surface. From the apex and 

 below the dorsum project two spinous cones like those upon the sides, and rather flatter; 

 the spinnerets are near the middle of the venter, are black, as is the surrounding space, 

 but the base encompassed with circular yellow spots. In front of the epigynum and mid- 

 way between it and the spinnerets is a strong lilack cone, projecting df>wnward. The 

 epigynum (Fig. 8a) shows a subtriangular atriolum, with a short flaplike projection serving 

 as a scapuB, which droops down towards the genital cleft. 



DisTKinuTioN : The habitat of Koch's tyjoe was unknown. Dr. Marx locates the species 

 in California. (Marx Collection.) 



No. 64. Gasteracantha maura, new species. Plate XIII, Fig. 12. 



Female: Total length, 8 mm.; cephalothorax, 4. .5 mm. long, 3..5 mm. wide, 3 mm. wide 

 at the face; abdomen, 7.5 mm. long, 11.5 mm. wide. 



Cephalothoeax : Rounded at the sides; corselet wider than long, truncate and indented 

 at the base, concave on the summit ; fosse a semicircular pit, with concavity directed forward ; 

 the surface roughened, scantily pubescent on the margin ; color dark glossy brown ; cephalic 

 suture marked, the head rising in a steep slope from the corselet, smooth, glossy black on 

 the posterior, slightly notched in the middle, where it is highest; the forehead as wide as 

 the eye space, leaving a triangular depression in the middle ; color glossy blackish to brown, 

 almost black. Sternum shield shape, compressed and pointed at the apex, longer than 

 wide ; sternal cones distinct ; indented at the margin and flattened in the middle ; glossy 

 black at the margins, with a median band of brownish yellow covered with bi-istlelike 

 hairs with strong bases; the labium long and oljtusel}' triangular, well rounded at the sides; 

 the maxilla! as wide as long, rounded at the tips and sides, color, as the labium, glossy 

 lilackish brown. 



Eves: Ocular quad on a prominence, rounded and more projecting in front, where it is 

 narrower than behind; sides somewhat longer than rear. The eyes are small, of about 

 equal size; MF separated by 1.5 diameters, MR Ijy at least two. Side eyes on tubercles 



