a a eS oe 
274 AMERICAN SPIDERS AND THEIR SPINNINGWORK. 
Mate: 5 mm. long; in color and form resembling the female. The cephalothorax 
is roundly oval, the summit of the corselet has two dark, brown bands, which run along 
the cephalic suture ; on the sides are irregular bands of yellow, bordered beneath by brown, 
and the margin of the corselet is yellow; skin with gray pubescence. ‘The ocular quad is 
longer than wide, the rear wider than the front; MF are slightly larger than MR, the latter 
about equal in size to SR. ‘The eyes of the rear row are nearly equally divided one from 
another, MR being slightly further apart. Of the front row the space between SF and MF 
is about one-half greater than the distance between MF. SI are quite small, the smallest 
eyes of the entire group. The first row of eyes is procurved; the rear row is slightly 
recurved. The palps are short; the digital bulb large, globular; the cymbium covered 
thickly with strong, yellowish hairs. The legs are yellow, with dark brown apical and 
median annuli; length, 1, 4, 8, 2, the first pair much longer and stouter. The tibie of 
leg-I are slightly curved, thickened towards the apex, upon the summit and sides of which 
are rows of strong, black spines; the other legs are armed with short, black spines; as in 
the female, the two terminal joints are decidedly thinner than the others. 
Disrrisution: The Gulf Coast of the United States and the West Indies. 
N 0. 121. Uloborus plumipes (?) Lucas. Plate XX VII, Figs. 4,5; XXVIII, Fig. 6. 
\ 1842. Uloborus Americanus, WaucKen’r* Ins. Apt., ii., p. 229; Appor, G. §., No. 44, 45. 
1845. Uloborus plumipes, Lucas . . . . Explor. de |’Algerie, Anim. Artic., i., 252; pl. 15, 
Fig. 8. 
1850. Phillyra mammeata, Henrz*, . . B. J. 8., vi. 25; Sp. U. S., 129, pl. 14, Fig. 16. 
1850. Phillyra riparia, Hentz... .. Ibid., v., Fig. 17. 
1869, Uloborus plumipes, Canesrrini & 
AVERT Slips isis Leese teat Archiy. p. la Zool. Anat. e la Fisiol., ser. ii., vol. ii. 
1881. Uloborus villosus, Kwysmruine* . N. Spinn. a. Amer., iii., Verh. Ges. Wien, 278, xi.,6. 
1888. Uloborus plumipes, EMmrron . . N. EK. Ep., Ciniflon., Trans. Conn. Acad., pl. xi., 1. 
1889. Uloborus plumipes, McCook. . . Amer. Spiders and their Spinningwork, I., II. 
Dr. Marx, in his Catalogue, considers Uloborus Americanus as a good species and identical 
with U. mammeata (Hentz). The figure in Abbot’s MSS. drawings, from which Walckenaer 
described his species, certainly resembles in outline Hentz’s drawing of U. (Phillyra) 
mammeata rather than his figure of U. riparia (plumipes); but the front row of eyes is 
more decidedly procuryed. I am inclined to think that the two species are the same, and 
are identical with U. plumipes Lucas. If so, Walckenaer’s name should have priority. 
Not having sufficient material to determine the point positively, I leave the name as above, 
and place in the synonyma marked (*) the series corresponding most closely with U. 
Americanus, as distinguished by Marx and Hentz. I believe, however, that it will prove 
that we have but one species under the various names as above, and that the confusion in 
names has been caused by the striking difference in appearance between the black forms 
and the yellow ones, as fairly represented upon the figures in my plates. Perhaps it may 
be concluded that these differences justify at least varietal names. 
Fremaie: Total length, 5 mm.; cephalothorax, 2 mm. long, 1.3 mm. wide; abdomen, 
3.5 mm. long, 1.75 mm. wide. 
CrrHALotHorAx: Oval, truncated at the base, the sides rounding with nearly equal 
width to the face; corselet high behind, where it is raised into two low humps by the 
parting of the median fosse, thence it slopes rather sharply to the base; the head elevated; 
color blackish brown, covered with yellowish pubescence. Sternum (4a) cordate, inclined 
to oval, longer than wide, of nearly equal width throughout except at the apex, elevated 
in the centre; color blackish brown, with gray pubescence. Labium about half the height 
of maxille, width about equal to length, the tip triangular; maxille squarish, longer than 
wide, truncate at the tips; color of both labium and maxilli yellow. 
Eyes: Ocular quad elevated in front, much wider behind than in front, and length 
greater than width; MF smaller than MR, and divided by about one diameter, MR by two 
