DESCRIPTION OF GENERA AND SPECIES. 231 
Eyes: Ocular quad on a rounded prominence, which projects in front, leaving MF on 
separate tubercles; decidedly wider in front than behind, and length greater than front 
width. MR separated by about 1.5 diameters, MF by scarcely more than a radius; space 
between MF and SF but little greater than that between MF; side eyes on tubercles, 
separated by about a radius; not greatly differing in size, but SF somewhat larger. Front 
row recurved, rear row, which is decidedly longer, slightly procurved, almost aligned. The 
space between SR and MR is about twice the diameter of the latter; the clypeus about the 
height of one diameter MF. 
Lxas: 1, 2, 4, 3; stout, short, yellow, with dark shades upon the femora; well provided 
with yellowish bristles and gray pubescence; sufficiently provided with stout, brownish 
spines; palps colored and armed as the legs; mandibles blackish brown; conical; parallel; 
slightly inclined backward. 
Anpomen: A long oval, not greatly differing in width throughout, but widest at the 
middle, and in specimens in hand rather narrowed at the base, which much overhangs the 
cephalothorax. The skin is glossy, covered with a yellowish white pubescence, which, being 
removed, leaves numerous minute pits. The folium is outlined on either side by a broad 
brown band, somewhat undulating at the margin; while a reticulated yellow ribbon occu- 
pies the median, narrowing both at the front and the apex, on either side of which are 
symmetrically placed five impressed dots, of which the basal pair are the largest. Both on 
the base and apex the brown marginal bands deepen into black. On the sides are reticu- 
lated ribbons of yellow, like that upon the dorsal median, and below this again mottled 
bands of brown, which quite encompass the spinnerets and the apex of the abdomen, 
which projects beyond the spinnerets about quarter the length of the venter. The latter 
is a broad band of brownish color, with interrupted and reticulated yellowish marginal 
ribbons, which pass as far as the spinnerets. The epigynum (Fig. 2b) has a short, sub- 
rectangular, spooned scapus, which does not extend beyond the apical margin of the 
atriolum, which presents towards the venter a deeply indented parm. 
Disrrizution: St. Louis, Missouri; District of Columbia. (Marx Collection.) I am com- 
pelled here to differ with the opinion of Dr. Marx (expressed both in his Catalogue and 
in the Synonyma of Keyserling’s Epeiridse) that this species is Hentz’s Epeira rubella. 
The thin legs and characters of the cephalothorax and abdomen, as shown in Hentz’s 
drawings, appear to me to be too unlike the spider here described to justify the supposed 
identity. ; 
No. 838. Singa Listerii, new species. Plate XIX, Figs. 3, 4. 
Fremate: Total length, 5 mm.; abdomen, 3.5 mm. long, 2 mm. wide. This species closely 
resembles 8. Keyserlingi; but in a large number of specimens from Georgia and North 
Carolina the differences in the shape and markings of the abdomen and color of the head 
are persistent. The midfront eyes are smaller than, or at least equal to, the midrear, while 
in S. Keyserlingi the midfront eyes are the larger. The ocular quad in 8. Keyserlingi is 
relatively wider in front than in S. Listerii, wherein the quad is slightly narrower than, or 
at least equal to, the midrear area. Moreoyer, in §. Keyserlingi the side eyes are well 
separated, while in §S. Listerii they are nearly contingent. 
CrrHaLorHorAx: Oval; the corselet high, well rounded, cordiform; the fosse a lateral 
pit; sloping to the base, which is notched; base of caput not lower than summit of corselet ; 
the head slightly elevated in the middle, but depressed at the face; cephalic suture well 
marked; corselet grooves distinct; color glossy; slightly pubescent; yellow, with dark 
streaks along the corselet grooves and caput; sternum shield shaped, slightly longer than 
broad; sternal cones distinct before all the coxze; dark brown, with a lighter yellowish 
band in the centre, where it is elevated; labium subtriangular, color of sternum, not half 
the height of the maxille, which are colored as the sternum, as wide as long. 
Eyres: Fig. 3b. Ocular quad on a rounded eminence, the centre of which is blackish ; 
the width in front slightly narrower than behind, or at least not wider; the sides of 
greatest length; MIF somewhat smaller than MR; MF separated by about or a little more 
