210 AMERICAN SPIDERS AND THEIR SPINNINGWORK. 
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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 maxille; maxille as wide as or wider than long, obtusely trian- 
gular at the tips, which are inclined toward one another. 
Eyrs: 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, MR 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; MF removed by scarcely a diameter therefrom ; front 
row slightly recurved, rear row is almost aligned, scarcely procurved, 
Leos: 1, 4, 2, 8; short, stout, bright glossy brown in color, with dark apical annuli 
which almost cover some of the joints; patellse wide; tibiee 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. 
Aspomen: 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 dimples 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 the 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 black cone, projecting downward. The 
epigynum (Fig. 8a) shows a subtriangular atriolum, with a short flaplike projection serving 
as a scapus, which droops down towards the genital cleft. 
Disrripution; The habitat of Koch’s type was unknown. Dr. Marx locates the species 
in California. (Marx Collection.) 
No. 64. Gasteracantha maura, new species. Plate XIII, Fig. 12. 
Femate: 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. 
CreHALorHorax: 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 bristlelike 
hairs with strong bases; the labium long and obtusely triangular, well rounded at the sides; 
the maxillee as wide as long, rounded at the tips and sides, color, as the labium, glossy 
blackish brown. 7 
Eyes: 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 by at least two. Side eyes on tubercles 
ee al 
