64 T. THORELL, 
stinctive marks, on which WHITE formed the genus Dinognatha, are too 
trifling to warrant the separation of the spiders thus characterized from 
Tetragnatha. 
Sub-family II. ULOBORINZE. 
Under this denomination I include those Epeiroidz, which are pro- 
vided with infra-mammillary organ and calamistrum. The spiders of this 
sub-family known to me all agree in at least one more respect, viz. that 
their legs are not armed with spines. Of the two European genera that belong 
to this sub-family, Uloborus and HHyptiotes, the first named had, ever since 
it was first so classed by LATREILLE, been considered as an Æpeiroid, until 
BLACKWALL discovered in U. Walckenarü (Veleda lineata BLACKW.) the 
agreement, which Uloborus, by the presence of an infra-mammillary organ and 
calamistrum, exhibits with Amaurobius (C. KocH) = Ciniflo BLACKW. and 
Dictyna SUND. = Ergatis BLACKW. That agreement induced BLACKWALL to 
refer Uloborus to the family Cinifonide, formed by him in 1841 for the two 
above named genera’), and placed between his Drasside and Agelenide, so 
that by BLACKWALL Uloborus is widely separated from the Epeiroidæ. KEY- 
SERLING?) assents to the opinion of BLACKWALL. — We have already in the 
preceding pages (p. 29) drawn attention to the unnatural character of the 
family Cinifonide, in that it not only brings together forms so widely sepa- 
rate as e. g. Uloborus and Amaurobius, but even includes Æresus and Di- 
nopis, for also these genera have an infra-mammillary organ and calamistrum. 
As regards especially Uloborus, it appears to me that its agreement with 
Epeira and Tetragnatha as well in the form of the cephalothorax and ab- 
domen as in the structure of the parts of the mouth and the extremities 
ete. must more than compensate the differences, which are found, and which 
we have indicated above; that agreement is so complete as scarcely to re- 
quire the additional evidence of this genus’ belonging to the Orbitelariæ 
or Epeiroidæ, which is furnished by the circumstance, that its species all 
spin regular, circular nets. We may also allow ourselves to call attention 
to a commonly overlooked characteristic, which is found in Uloborus, as also 
in all other Epeiroide that I know of, and in a part only of the Theridior- 
de and Scytodoide, but which is absent in the Tubitelariæ (even Amaurobi- 
— Another nearly related genus is Oxysoma NICOLET (GRAY, Hist. fis. y pol. de 
Chile, Zool., III, p. 511). 
1) BLACKWALL, The differ. in the number of eyes, etc., p. 606. 
2) Beschr. neuer ete. Orbitelæ, p. 2 (64). 
