110 T. THORELL, 
B. Tarsi articulo unguifero distincto carentes. 
a. Pars cephalica impressionibus lateralibus a parte thoracica sepissime 
distincta. Mamillæ superiores inferioribus plerumque multo longiores. 
a. Cephalothorax brevis, sub-reniformis vel inverse cordatus, parte 
cephalica parva. Mamille superiores reliquis multo longiores, arti- 
culis binis: 2% longo, compresso. Mandibulæ parvæ, debiles. Ma- 
xillæ in labium valde inclinate. Oculi 8. Tarsorum ungues trini. 
I. Urocteoide. 
B. Cephalothorax oblongus, parte cephalica majore, sæpissime elevata, 
convexa. Mamillæ superiores reliquis plerumque longiores et tum 
subtus tubulis textoriis præditæ. Oculi 8, rarissime (in gen. Hadi- 
tis) nulli. Tarsorum ungues trini (excepto in gen. Agræca). 
EC ce Ct Rc) OPEC P n d on a LE IIl. Agalenoide. 
b. Pars cephalica a parte thoracica non distineta. Mamillæ superiores in- 
ferioribus non vel parum longiores. 
a. Mandibulæ inter se libere, ungue medioeri vel longo. Labium non 
eum sterno coalitum. — Oculi 8, rarissime (in gen. Thysa) 6. Ungues 
tarsorum bini 6 EL 6 oo 6 6 6 0 0 IN, Ste 
B. Mandibulæ versus basin inter se unite. Labium cum sterno coali- 
tum. Oculi 8. Ungues tarsorum trini. . . . . VI. Filistatoide. 
IL Stigmata 4, bina in utroque latere ad basin ventris: anteriora saccorum, po- 
steriora tuborum trachealium. Oculi 6, rarissime (in gen. Séalita) nulli. Un- 
gues tarsorum trini aut bini. . . . . . . . . . . . V. Dysderoide. 
Fam. I. UROCTEOIDÆ. 
The few spiders belonging to this family appear to me to stand just 
upon the boundary-line between Tubitelariz and Retitelariæ, and might with 
almost equal reason be attributed to either of these sub-orders. By their or- 
dinarily short extremities, and in a certain degree also by their general ap- 
pearance, the Urocteoidæ exhibit an approach to the more short-legged forms 
among the Theridioida, e. g. Asagena and Euryopis. The small mandibles united 
towards the base show their relationship with the Scytodoidæ and Filistata. 
With the last-named genus and the Ænyoidæ they agree in the structure of 
the female's palpal claw, and with the Enyoidz also in the position of the 
eyes (the 8 eyes form two transverse rows, curved forwards); but they dif- 
fer from them in the absence of a separate claw-joint on the tarsi, in their 
entire general appearance, and especially in their spinners. (Conf. p. 106). 
We class them among the Tubitelarie principally because the superior 
(posterior) spinners are considerably longer than the others, and are, at least 
