TETRAGNATHA. 9 
Tetragnatha longa, sp. n. | 
Adult female, length 4 to over 5 lines ; of cephalothorax 1-13, of abdomen 3-33 lines. Length of an adult 
male, 4 lines; of abdomen 3 lines. 
This spider is allied to 7’. tenuis, but may be easily distinguished by the cephalothorax being marked with four 
longitudinal brown stripes (a submarginal one on each and two near together along the middle; these last 
are rather irregular, and tend to run together into one). The eyes also of the lateral pairs are separated 
from each other by nearly as wide an interval as that which divides the fore and hind central eyes; the 
interval appears to be greater in the female than in the male. The eyes of the hind central pair are 
wider apart than each is from the hind lateral on its side, the fore centrals being nearer. together than 
each is from its fore lateral eye. 
The legs are very long and slender, 1, 4, 2, 3; their colour is greenish-yellow, the spines short and weak, and 
issuing from small obscure dusky spots. 
The faices less in length than the cephalothorax, moderately strong, divergent, but not excessively so, those of 
the male having a not very large, curved, tapering, not very sharply, but simply pointed denticulation 
directed forwards near the fore extremity on the upperside; besides this there are no other denticula- 
tions, excepting the two rows of much smaller ones between which the fang lies when at rest. 
The palpi of the male differ from those of 7’, tenuis, They are short; the cubital joint is shorter, though more 
than half the length of the radial. The palpal organs are of the usual general structure; the main lobe 
extends to half the length of the digital joint, and the terminal process is strongly twisted and its point 
projects just beyond the end of the digital joint. There is also a circularly curved, black, tapering spine 
at the fore part of the main lobe, the filiform ends of the spine threading as it were the twist of the 
terminal process. 
The abdomen is long, slender, and cylindrical; it is of an obscure greenish-yellow hue, thickly stippled above 
and on the sides with small silvery spots, and the upperside has an indistinct, dark, irregular marginal line 
on each side. The underside is blackish-brown. The sternum is also darkish yellow-brown, the mawille 
and labium only tinged with that hue. 
Hab. Guatemata, Polochic valley between Tucuru and Chamiquin, and Salinas de 
Nueve Cerros (Sarg). 
Tetragnatha tenuissima, sp. n. 
Adult female, average length 5 lines ; of abdomen 4 lines. Adult male, average length a little over 33 lines ; 
of abdomen slightly over 1 line. , 
The cephalothorax of this very slender and attenuated species is marked with some dusky-brown lines on the 
normal indentations, the ground-colour being yellowish with a brown tinge. 
The eyes of the lateral pairs are near together but not contiguous ; in other respects their position resembles 
that of 7’. longa. 
The legs are excessively long, 1, 4, 2, 3; those of the first pair are, in the male, at least three and a half 
times its own length. The spines are very short and slender; they are like the cephalothorax in colour. 
The palpi (of the male) are moderately long, very slender, similar in colour to the legs; the cubital is a little 
longer than the radial joint ; the digital joint is long, longer than the radial and cubital joints together ; 
the main lobe of the palpal organs does not reach halfway towards the end of the digital joint. The 
terminal process, twisted at its base, extends, in conjunction with a black spine, quite to the end, if not 
slightly beyond, the extremity of the digital joint. 
The falces are long, equalling in the female, exceeding in the male, the length of the cephalothorax ; they are 
rather slender, very divergent, strongly bent, enlarging towards their extremities, near which, on the 
upperside, is a long, strongly bent (almost hooked at its end) tooth, directed forwards, and with a pro- 
minent point near its extremity on the upperside, giving the end of the tooth a more or less strongly 
bifid appearance; on the inner side of this tooth is.a simple, straight, and not half so long a denticulation, 
and some little way behind it, rather on the inner side, is another, the latter strong, straight, or only 
very slightly curved, and sharp, directed inwards. These two articulations, in fact, belong to the normal 
two rows between which the fang is disposed when at rest; but they are here (as.in many other allied 
BIOL. CENTR.-AMER., Arachn. Aran., July 1889. cf 
