198 AMERICAN SPIDERS AND THEIR SPINNINGVVORK. 



much nan-owed at the tips, parallel curved on the anterior surface, receding; dark lirown 

 at the base, and j'ellowish brown beyond. 



Abdomen : As wide as or wider than long, forming a well rounded oval or irregular 

 hemisphere, which is thickest at the base, where it rises up into marked height. (Fig. la, 

 side view.) The crest is surmounted by two large conical tubercles. The front overhangs 

 the cephalothorax, is wide and high ; the apical half is arched towards the spinnerets, which 

 are placed somewhat beneath the apex. The dorsal field is without a folium, is bright 

 yellow, with longitudinal lines passing backward along the muscular pits, which are prom- 

 inent; in some specimens the lines traverse both sides, widening to the venter, giving tliis 

 part a striped appearance. The front is olive or blackish brown, mottled with yellowish, 

 irregular spots; surftice glossy, extremely rugose, marked with numerous black circular pits, 

 arranged laterally in semicircles, curved backward ; these pits are found along the sides and 

 apex, though rather small. The venter has a broad yellow patch, with four or five black 

 circular spots arranged longitudinally, and a wide, brownish, median band, which is wanting 

 in some specimens; the epigynum (Fig. lb) shows a long atriolum, with a tonguelike 

 scapus, short, rounded, and wide at the tip, folded down flat against the genital cleft, almost 

 as though it were attached thereto ; the scapus is brown, the front of the atriolum on either 

 side of the portuUe yellow. In one specimen (Fig. Ic) in the INIarx collection the abdomen 

 is yellowish brown, smooth, showing only two indentations, and the shoulder humps, 

 instead of Ijeing well in the front, as above described, are set oflf at the sides, a result, 

 probably, of the gravid condition of this female. 



Distribution : I have received a number of this species, females, from California, where 

 it appears to be common (Mr. S. R. Orcutt, Mrs. Eigenmann, Mrs. Smith, Dr. Davidson, 

 Dr. Blaisdell) ; and cocoons (Vol. II., page 98) from various localities, ranging from Fort 

 Yukon, Alaska, to San Diego. Becker described it from Louisiana, and llentz's oi-iginal 

 description is from Alabama. Dr. Jlarx records it in the District of Columbia and Virginia. 

 It is, no doubt, distributed throughout the entire Southern States, and along the Pacific 

 Coast in California. Have collected it in Pennsylvania. 



No. 55. Ordgarius bisaccatus (E.merton). Plate XII, Figs. 2, 3. 



1884. Cyrtarachne bisaccatus, Emerton . N. E. Sp., p. 325, pi. xxxiv.. Fig. 11. 



1889. Cyrtarachne bisaccata, McCooK. . . Am. Spid. and their Spinningwork, Vol. II., p. 95. 



1889. Ordgarius bisaccatus, Mar.'c . . . Catalogue, p. 541. 



1892. Ordganus bisaccatus, Keyserling. Spinn. Amerik., Ep., p. 42, ii., 35. 



Female: Total length, 10 mm.; cephalothorax, 3 mm. long, 3 mm. wide in the middle, 

 and 2 mm. in front; abdomen, 6 mm. long, 7 mm. wide; in front more than half as broad 

 as in the middle. It may at once be distinguished from 0. eornigerus l)y the absence of 

 shoulder humps. 



Cephalothora.x : Bounded at margin; fosse concealed behind the face, which rises 

 from the eye space into an exceedingly high subtriangular vertex, terminated on either 

 side of the summit by two rectangular or castellated prominences, cleft at the top into two 

 obtusely pointed cones, the inner ones the longer. The entire face is covered with numer- 

 ous warts, which extend to the summit of the vertical prominences; corselet grooves dis- 

 tinct; cephalic suture indistinct; color of corselet behind, yellow; around cephalic suture, 

 Ijiown ; forehead and head again yellow. Sternum shield shape, somewhat longer than 

 wide; stern.il cones in front of coxje-I and III; color yellow; slightly pubescent; base with 

 a semicircular depression next the labium, which is subtriangular, half as long as the 

 maxillae, which are gibbous, apparently a little longer than wide, and colored as the sternum. 

 • Eyes : Ocular quad on a rounded eminence ; rear slightly wider than front, and the 

 sides shorter than either; MF larger than MR, separated by about 2.5 to 3 diameters, while 

 SR are separated by three or more; rear eyes on tubercles, almost contingent, not greatly 

 differing in size; the space between SF and MF 1.3 area of latter, or about twice or less 

 the intervening space; both rows procurved ; the clypeus is high, the margin separated 



