148 AMERICAN SPIDERS AND THEIR SPINNINGWORK,. 
apex; this is flanked on either side by well shaded margins of dark color. This pattern 
shows much more distinctly on some specimens than others and tends to be obliterated 
with advancing age. (See Plate II., Fig. 4.) The venter has a wide, black subtriangular patch 
surrounded by a broad yellow margin, presenting the appearance of a military chapeau, 
sometimes interrupted, leaving but two large circular spots on either side. The spinnerets 
are bright orange or brown with an interrupted girdle of yellow, one large patch on each 
side forward of the base. The epigynum (Plate I., Figs. 7a, 7b) has a strong curved scapus 
almost as wide as the atriolum at its base, where the color is yellow or orange yellow; it is 
compressed about the middle and widened into a spooned bowl; it is furrowed on either 
side with a hard blackish brown rim almost to the base. 
Mate: Plate I., 7c; Plate II.,5. The male resembles in color the female, though there is 
a tendency to lighter hues. The body is provided with the same long, strong, whitish bristles 
and hairs that mark the female. These are often strong on the eyebrows and the margin 
of the cephalothorax, and they form decided brushes upon the palpal joints. The tibia of 
the second leg is curved outward and provided on the inner and under side with a double 
row of short toothlike spines extending the entire length, flanked on one side by a single 
row, the long spines making a formidable clasping apparatus. 
Disrrisution: This is one of the most common of our American species and is widely 
and probably generally distributed throughout the United States. I have specimens ranging 
from New England to Florida along the Atlantic Coast, and as far west as California. 
I have taken it in Portland, Oregon, and Dr. Marx reports it from Nebraska, Texas, Utah, 
in Colorado at a height of twelve hundred feet, in Minnesota, and at various points along 
the Atlantic Coast. 
No. 8. Epeira arabesca Watcxenarr. Plate I., Figs. 8, 8a.; Pl. II., Figs. 6, 7. 
1805. Epeira arabesca, Wauckenarr. . Tableau des Araignées, p. 63, No. 44. 
1837. Epeira arabesca, WA1cKENAER. . Ins. Apt., ii, p. 74; Appor, G. S., Nos. 331, 346. 
1837. Epeira mutabilis, WaicKnnarr . Ins, Apt., ii., p. 73, No. 58, in part; Annort, G. S., ‘a 
No. 355. 
1864, peira trivittata, Keyseruina . . Beschr. n. Orbit., Isis, p. 95, 6-9. 
1884, Epeira trivittata, Emerton. . . . N. E. Ep., p. 311, xxxiii., 16; xxxvi., 2, 3, 5, 8. 
1888. peira arabesca, McCook . . . . Proceed. Acad. Nat. Sc., Phila., p. 3. 
1889. Epeira trivittata, McCook . . . . Amer. Spid. and their Spinningwork, Vol. I. 
1889. Hpeira arabesca, Marx .... . Catalogue, in loc. 
1892. Epeira trivittata, Keyseruinc . . Spinn, Amerik., p. 172, pl. viii., 127. 
Fremate: Body length varies from 6 to 8 mm.; cephalothorax, 2.5 mm. long, 2 mm. 
wide; abdomen, 5 mm, long, 4 mm. wide at the base, narrowing much at the apex. Like 
Epeira Benjamina, which this species resembles in many respects, the general color varies 
from reddish brown to yellow. 
CrrHaLoTnorax: Cordate, elevated at the centre, sloping abruptly to the indented base ; 
the fosse a longitudinal slit; corselet grooves and cephalic suture distinct; color yellow to 
orange yellow or brown; freely covered with yellowish white hairs, especially on the sides 
of the caput, which form strong eyebrows at the side; the head depressed, sloping to the 
face; sternum shield shaped, somewhat longer than wide, sternal cones distinct; pubescent 
edges brown, with broad median yellow band upon the middle; lip low, obtusely triangu- 
lar; maxillee about as wide as long, obtusely triangular at the tips; labium and maxille 
yellow. 
Eyes: Ocular quad upon an eminence projecting in front, leaving MR scarcely elevated 
aboye the facial surface; the front somewhat longer than the rear, and the sides longer 
than either; the eyes about equal in size, though MR appear slightly larger; MF separated 
by about 1.3 diameter; MR by about a radius; eyes upon tuberclés, barely contingent; SF 
larger than MF, and separated by about a little more than the area of the former, or 1.5 times 
