DESCRIPTION OF GENERA AND SPECIES. 263 
CrrmatorHorax: A long oval, truncated at the base, the fosse deep, and corselet 
grooves rather indistinct; dorsum flat; head slightly elevated, and but lightly depressed in 
front; color brown, with lighter shades of yellow, particularly at the face. Sternum (7c) 
longer than wide, widest at intersection of second cox, and much tapering towards the 
apex, rounded in the centre; color yellow or yellowish brown, slightly pubescent. The 
labium rounded at the tip, about one-third length of maxille, which are normal. 
Eyes: Ocular quad elevated in front, MR scarcely elevated above the facial surface. 
The front narrower than the rear, the latter about the length of the sides; MF smaller, 
separated from one another by about 1.5 diameter; MR separated by at least two. The 
side eyes, of which SR are larger, are separated from each other as widely as, or more 
widely, than MF from MR, but the distance not so decided as in Eugnatha. The front row 
is nearly as long as the rear row. The front row is slightly recurved, the rear row also 
recurved. MF are separated from SF by about 1.3 their area, or 2.5 times their intervening 
space. The clypeus is about the height of 1.5 to 2 diameters of MF. 
Leas: 1, 2, 4, 3; long, thin, armed with slight bristles of yellowish gray color, and a 
few long, feeble, dark brown spines. Color yellow, with a slightly darker annulus at tips of 
joints. The first leg is from six to seven times the length of cephalothorax. The palps 
are light yellow, the mandibles (7b) wide towards the middle, thence slightly convex 
on the inside, straight upon the outside; the skin glossy and a warm yellow; the fangs 
dark brown or blackish; the mandibular teeth not greatly differing in size. The fang is 
without a basal tooth, is as long as the maxills (6b); not undulate. 
AxspomEeNn: Cylindrical, about four times as long as wide; somewhat thicker in the 
basal than the apical half, the difference being more decided in some specimens than 
others. Many individuals show the abdomen almost straight, others slightly arched in the 
basal half. The spinnerets are placed beneath the apical wall, which slightly overhangs. 
The skin is reticulated, covered quite closely with short grayish hairs; the color silvery, 
with streakings of yellow. The dorsal folium consists simply of a median line of brownish 
hue with various radiating veins. The venter shows a dark brown band extending from 
the gills to the spinnerets, flecked on either side by bands of yellow and lighter shade in 
the middle. The epigynum (7d) is an arched hood without scapus. 
Mater: Fig. 8 in color closely resembles the female; the eyes show little or no differ- 
ence. The radial joint of the palpus (8b) is about half as long as the digital and nearly 
equals in length the cubital joint, 
T. laboriosa may be distinguished from T. extensa, T. elongata, and T. Banksi by the 
side eyes, which are further removed from one another than midfront from midrear, instead 
of being placed nearer to one another than, or as near as, MF from MR. Moreover, Labori- 
osa’s abdomen has a silvery sheen, and as a rule is of more even thickness throughout ; but 
in the latter respect one observes differences, for some examples of T. extensa especially 
approach T. laboriosa in the form of the abdomen, and the latter, on the contrary, some- 
times is thickened towards the base. Most species, except T. laboriosa, when in alcohol, 
have the reticulations on their sides a metallic golden hue. 
It is more difficult to distinguish between T. elongata and T. extensa. This, however, 
may be done as follows: The eyes, substantially, are alike in their arrangement; but the 
mandibles of Elongata are relatively somewhat longer than the cephalothorax, being .8 as 
long at least, while the mandibles of Extensa are at most .7 as long. Again, the first pair 
of legs of Elongata are eleven times as long as the cephalothorax, while the first leg 
of Extensa is only about six or seven times as long as the cephalothorax. The female of 
each species has a tooth which points forward placed upon the upper part of the mandi- 
bular fang near the point of articulation, but in T. elongata this is relatively larger than in 
T. extensa. It is wanting in the male of both these species. A similar tooth, but apparently 
less decided, is found upon the fang of the female T. laboriosa. Elongata male may be 
further distinguished from Extensa by the fact that the margins of the mandibular shield 
or furrow have at least ten to twelve teeth, while Extensa numbers but six to eight. 
Elongata also appears to grow to a much larger size, and the tendency in the adult species 
is to have the abdomen much thicker relatively at the basal half than the apical half, and 
