124 T. THORELL, 
Duk 
X 
posterior central eyes is about an eye's diameter, and a little less than the 
distance between them and the posterior lateral eyes. "The eyes of the an- 
terior row, like the lateral eyes, are so near each other as almost to be 
contiguous. The mandibles are strong, and, seen from the side, almost 
pear-formed; when seen from in front, slightly tapering at the extremity, 
convex and somewhat projecting at the base, the length about double the 
breadth. The maxillæ are dilated at the base, sinuated a little inwards at 
the extremity, and somewhat inclined towards the lip, which is large, al 
most triangular, and rounded at the apex. The last joint of the female’s pal- 
pus is cylindrical, not gradually tapering. Legs short, of almost equal length, 
hairy, but without spines. The abdomen is short, inversely ovate; the spin- 
ners are tolerably far apart (almost as in Crypheca): the superior somewhat 
longer and thicker than the inferior, distinctly two-jointed, with the second 
joint slenderer and much shorter than the first. The superior tarsal claws 
are much curved, with about 9 very long, parallel comb-teeth of about 
equal length; the inferior claw is small, with two long, fine, curved teeth. 
The palpal claw has at least 3 teeth. 
Gen. 3. TITANŒCA. wx. 
Deriv.: tévavoc, lime-stone; oëxéw, inhabit. 
Syn.: 21805. Theridium Warck., Tabl. d. Aran., p. 72 (”6° Fam. Les Cachées, Abscon- 
date”, ad part.). 
1831. 2 Haun, Die Arachn., I, (ad part.:) p. 84. 
1837. Asagena OC. Koch, Uebers. d. Arachn.-Syst., 1, p. 13 (ad partem). 
1850. Lathrodectus ID., ibid., 5, p. 23 (ad partem). 
?1864. Theridium: sub-gen. Eucharia Sim., H. N. d. Araignées, p. 165 (ad partem). 
1867. Amaurobius Auss., Die Arachn. Tirols, I, p. 150 et 162 (ad partem). 
Type: Titaneca quadri-guttata (HAHN). 
I have found it necessary to create this new genus for HAHNS The- 
ridium 4-guttatum (= Amaurobius Kochi AUSS.; Ther. obscurum WALCK.?), 
which is widely different from both Theridium and Lathrodectus. It has in 
fact infra-mammillary organ and calamistrum, and is, in the form of the ce- 
phalothorax, mandibles, and parallel maxillæ, intimately related to the genus 
Amaurobius. Even the position of the eyes is almost identically the same 
as in that genus. In its broad, heart-formed sternum, in the absence of 
spines on the (6 posterior) extremities, and in its colour, it much resembles 
certain genera among the Theridioide, especially Asagena. The lateral 
