528 ARANEIDEA. 
6°. Abdomen with six or eight spines. 
a’, Abdomen with six spines, sometimes also with a pair 
of very minute spinules at the base of the posterior 
dorsal spine, behind. Sternum not markedly convex. sagittata, Walck. 
6°. Abdomen with eight spines. Sternum very convex . gladiola, Walck. 
ii, Abdomen without a pair of anterior marginal spines. 
a’, Abdomen not itself apically bifid. 
a’, Apex of abdomen with a single pair of longer or shorter 
spines, a single stout one at each angle. 
a’*. Two abdominal spines only. . . . . . - + « + dimucronata, O. P.-Cambr. 
6, Four to six abdominal spines. 
a’. Four abdominal spines only . . . . . . . « Catenulata, sp. n. 
6°. Six abdominal spines. . . . . . . . « « « =obtusospina, Keyserl. 
b", Apex of abdomen bearing two pairs of comparatively very 
short spines. 
a'*, Upper posterior spine always larger than the lower. . patruelis, C. L. Koch. 
b. Upper posterior spine not larger than the lower. . . mitrata, Hentz. 
6°. Abdomen itself apically bifid. 2. . 2. . . «© . . © . furcula, O. P.-Cambr. 
Norr.—The males and females of J/. fericula are not fully mature, and their characters do not therefore 
appear in the Table. I. mitrata, Hentz (¢ ), is not known to me, 
1. Micrathena gracilis. (Tab. L. figg. 3,3 a-d,?; Tab. LI. figg. 16, 16 a, ¢ .) 
Epeira gracilis, Walck. Tabl. des Aran. p. 65 (2). 
Plectana gracilis, Walck. Ins. Apt. ii. p. 193 (?)*; Abbot, Georgian Spiders, nos. 47, 48 (?) °. 
Acrosoma gracile, McCook, Amer. Spid. iii. p. 212, t. 21. figg. 1-3 (?), 4, 4a-e (¢)*. 
Acrosoma matronale, C. lu. Koch, Die Arachn. xi. p. 68, t. 176. fig. 887 (?)°. 
Micrathena matronalis, E. Simon, Hist. Nat. Araign. édit. 2, i. p. 852, fig. 102 (9) °. 
Epeira rugosa, Hentz, Journ. Bost. Soc. Nat. Hist. vi. p. 21, t. 3. figg. 10, 10a (¢?), 105 (g)’; 
Spid. U.S. (ed. Burgess) p. 124, t. 14. figg. 10, 10a (?),108(¢)°. 
Acrosoma rugosa, Emerton, Trans. Conn. Acad. Sci. vi. p. 326, t. 38. fig. 10 (?)°; Banks, Proc. 
Calif. Acad. Sci. (3) i. p. 250”. 
Type, 2,= fig. 47, Abbot’s Georg. Spiders, North America. Total length 10 millim. 
®. Carapace deeply indented between the cephalic and thoracic areas. Central quadrangle of eyes slightly 
wider behind, central posterior eyes less than one diameter apart, central anteriors about half a diameter 
apart, laterals almost in contact. Clypeus equal! to two diameters of the anterior central eyes. Femora 
of legs densely granulose with setigerous tubercles; patelle feebly dilate behind. Sternum with a 
slight convex boss opposite the cox of legs 1., il., iil, produced posteriorly to form a conical convexity, 
which does not lie between the cox iv., but terminates in front of them, although the sternal chitin 
is continued on to the pedicle. Fang-groove with four teeth above, three below. 
Abdomen broad oval-triangular (seen from above), very deep, owing to the developed tube containing the 
spinners (seen in profile); the integument is closely punctured throughout with minute pits; the dorsal 
margin has five subequal, similar, stout spines, which are basally broad on each. side, the third having a 
conspicuous basal dilatation behind; the vulval scapus is narrow and elongate, having a large apical 
cavity on each side. 
$. Carapace elongate, narrowed behind, cephalic region globular, margins punctured, central fovea and three 
lateral fovee punctiform. 
