DESCRIPTION OF GENERA AND SPECIES. 195 



but eight tubercles to Stellata and twelve to Nobilis. Occasionally I find specimens with 

 one less or more than the normal number of eleven or thirteen, this asymmetry always 

 occurring in the row across the apical wall, as in Plate XIII., Fig. 9, x. To Ejieira cerasise 

 and E. iris, which I regard as one with the above, he also assigns twelve tubercles. I have 

 both the male and female of this variety in large numbers from Georgia, collected from 

 substantially the same territory as jNI. stellata. There is much variety in dorsal patterns 

 among immature specimens, a number liaving a marked broad band of plumose hairs across 

 the middle, as in Plate XIIL, Fig. 9. The adult male corresponds with that of M. stellata, 

 except in the additional two small tubercles in the apical row. 



No. 52. Marxia grisea, new species. Plate XIII, Figs. 10, lOa, lOb. 



Fe.male: Total length, 8 mm.; cephalothorax, 4 mm. long, 3,5 mm. wide; face, 2 mm. 

 wide; abdomen, 6.5 mm. long, 5 mm. wide. I have seen but one specimen of this interest- 

 ing species. It closely resembles JIarxia stellala, at first glance, in its general appearance, 

 but the clypeus is lower and the arrangement of alidominal tubercles is entirely different. 

 The prominent frontal cone which marks M. stellata is wanting, and the median row of 

 four aligned tubercles along the apex is peculiar to this species. The shoulder cones also 

 are single and not double. 



C'KPiiALOTnoEAX : A rounded oval, truncated behind, flattened and sloping from the 

 crest backward ; the cephalic suture deep, the corselet grooves distinct, the fosse a wide and 

 rather deep lunette overhung by the abdomen. The head is rather quadrate, square in 

 front, divided into two low ridges by a lateral depression passing just behind the ocular 

 quad, giving the head a lumpy appearance. Two small black circular spots, arranged on 

 either side of the median line, mark both the anterior and posterior part of the caput, the 

 latter being in the suture. The corselet is covered with yellowish hairs and the head more 

 sparsely with the same; color yellowish brown. Sternum shield shaped, with conical 

 elevations in front of cox;e-I, III ; elevated in the middle, which is marked by a black pelt 

 shaped figure ; the margins are yellowish brown. Labium triangular, wider than long ; 

 maxilke bluntly triangular at the tip, rounded at the sides, and somewhat longer than wide. 



Eyk: Ocular (juad on a high prominence, the front about equal in length to the sides 

 and slightly wider than the rear; MF separated about 1.5 diameter; MR, which are slightly 

 smaller, separated by 1.5 diameter. Side eyes upon decided tubercles ; SR as large as SF, 

 from which they are separated by at least a diameter, and are placed behind, well to the 

 side. MF are removed from SF by about 1.5 the area of IMF. The front row is slightly 

 procurved, as is also the longer rear row. The clypeus height is about two diameters IMF. 



Legs : Order of length, 1, 2, 4, 3 ; yellow, with brownish bands at the tips of the joints 

 and the middle of the femora. They are heavily clothed with pubescence, with liristles, 

 and numerous white spines with brown bases. The palps are heavily armed with gray 

 bristles, especially upon the last two joints, and colored v.s the legs. The mandibles are 

 conical, well separated at the tips, where they are dark brown, the bases being yellowish 

 brown, glossy, but provided with jellowish gray bristles. 



Abdomen : A rounded oval, heavily covered with yellowish gray pubescence and 

 plumose hairs. The dorsal margins are marked by ten tubercles arranged in an arc, con- 

 taining five on each side. Four others are arranged along the median line of the apical 

 half of the dorsum, passing over the ajaex one above another, the anterior one being upon 

 the dorsal field. (Fig. 10a.) There are thus fourteen tubercles in all. There is no tubercle 

 upon the midiile front of the base as in M. stellata. The color is yellow, with a scalloped 

 or dentate folium lightly edged with brown, and a dark median band passing along the 

 entire dorsal field, which widens at the apex, over which it passes to the spinnerets. The 

 venter is an interrupted yellowish broad band. The epigynum (Fig. 10b) scapus has a wide 

 triangular base, with a long stalk, flat on lower surface, of equal width for most of its 

 length, and terminating in a rounded point. 



Distribution : Biscayne Bay, Florida. (IMarx Collection.) 



