DESCRIPTION OP GENERA AND SPECIES. 263 



Cephalothorax : A long oval, truncated at the base, tlie 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 coxfe, 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 niaxillaj, 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 ]\IR, 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. 



Legs; 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 cejihalothorax. 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 difl'ering in size. The fang is 

 without a basal tooth, is as lung as the maxillre (Ob) ; not undulate. 



Abdomen : 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. 



Male: 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 res]iect 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. IMost 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 



