LA A 
On EUROPEAN SPIDERS. 125 
eyes are however still more distant than in that genus, which is probably 
"the reason why C. KocH, after having first assigned it to Asagena, sub- 
sequently transferred it Lathrodectus. 
The anterior row of eyes is very slightly bent forward, almost straight. 
The mandibles are a little thicker than the femora, perpendicular, their back 
straight, only a little convex towards the base (in ©). The maxillæ are 
almost double as long as the lip, parallel, without impression, slightly 
rounded on the outside, straight on the inside, the apex rounded exteriorly. 
The relative lengths of the legs is 1, 4, 2, 3. The calamistrum is re- 
markably strongly developed: its bristles proceed from short, almost cylin- 
drical nipples, directed obliquely backwards, which form a row following 
the superior border of the compressed metatarsus. The inferior spinners 
are somewhat thicker and longer than the superior, two-jointed, with very 
short 2" joint. The palpal claw is armed with about 10 strong, closely set 
comb-teeth, pointing much forwards, and situated along almost the whole length 
of the claw: the superior tarsal claws, which are remarkably powerful, have 
about 9 stout comb-teeth directed somewhat forwards, and their free extre- 
mity is somewhat thickened in the middle; the inferior claw is small, but 
stout, with three pointed, curved teeth gradually increasing in length. 
I have found several examples of this species at Kissingen in Ba- 
varia, but only females and young males, under stones in dry chalky de- 
clivities. In these the 1* pair of legs have but one spine near the extremity 
of the thighs: according to AUSSERER (loc. cit. p. 163) the adult 7 has 8 pairs 
of short, knife-formed spines on the underside of the tibiæ of the first pair 
of legs, and the mandibles are excavated inwards and in front, as in Dic- 
tyna, but less distinctly. The 6 other legs are without spines. 
T. 4-guttata appears then to stand about half-way between Dictyna 
and Amaurobius, which latter it more resembles in its habits. Both AUSSE- 
RER and L. KocH !) have already expressed the opinion, that it ought to 
form an independent genus, distinct from Amaurobius. 
Gen. 4. LETHIA Mence. 1869. 
Deriv.: "Aj9ua, occulta”: MENGE (Aij9o = Aavddvw, to be hidden). 
Syn.: 1855. Ciniflo BLACKW., (ad part.:) Descr. of two newly disc. spec. of Aran., p. 120. 
1861.  , ID., Spid. of Gr. Brit., I, p. 139 (ad partem). 
1869. Lethia MENGE, Preuss. Spinn., III, p. 249 (saltem ad part.). 
Type: Lethia humilis (BLACKW.). 
1) Die Arachn.-gatt. Amaur., Col. u. Cybæus, p. 31. 
