542 . ARANEIDEA. 
b. Base of mandible with a more or less well-developed rastellum 
at the apex. Spinning-mammille short, stout, and closely 
situate atthe base . . . . 1 1 ee ee ee e+) 6 CrENIZID# (p. 5), 
B. Tarsi with claw-tufts; inferior claw seldom present (sometimes 
in immature forms and in some males on tarsi iv.) . . . . THERAPHOSID# (p. 18). 
Sect. ARACHNOMORPH & (p. 42). 
The plane of the articulation of the mandibles horizontal. 
Pulmonary sacs two in number (except in Hypochilus), the 
second pair replaced by tracheal tubes. 
A. Cribellum and calamistrum present. 
a. Tracheal stigmata situated midway between the genital rima 
and the spinners. Mandibles soldered together at their 
base. . . toe ee Loe ee . . . . Frurstarm (p. 45). 
5. Tracheal stigmata situated immediately in front of the spinning- 
mammille. Mandibles not soldered together basally. 
‘i. Tarsal claws 8. 
a’, Ungual tufts present on the tarsi . . . . . . . . Psecurips@ (p. 356). 
6’. No ungual tufts on the tarsi. 
a. Central anterior eyes abnormally large . . . . . DEINoPID# (p. 359). 
6°. Central anterior eyes normal in size. 
a’. Anal tubercle elongate, conical . . . . . . . ULoxsorip# (p. 860). 
b°. Anal tubercle short, semicircular. . . . . . . Dicrynips (p. 357). 
ii. Tarsal claws 2. 
a‘, Tarsi i. and ii. not scopulate. Ungual tuft present . . ACANTHOCTENID (p. 354). 
b*. Tarsi i. and i. densely scopulate beneath. Ungual tuft 
absent. . 2. 2. 1 6 ee ee ew we ew ee) 6ZGOROPSIDE (p. 353). 
B. Cribellum and calamistrum absent. 
a. Tracheal stigmata (or second pair) widely separate, not 
migrant, situated close to the first pair (whether pulmonary 
or tracheal). 
a’. The first pair of stigmata opening on to pulmonary sacs. 
. Colulus present. . . . . . . . . . . . ©. . Dysprrip# (p. 42). 
. Colulus absent . . . . w se . . . « Oonopipa# (p. 44). 
b. _ first pair of stigmata (as well as the second) opening on 
| to tracheal tubes . 2... . . 1 ee ee SC Capontirpm (p. 43). 
b. Tracheal stigmata (or second pair) coalescent, migrant, more 
or less remote from the genital rima. 
aa. Kyes 8. 
I. Tarsus iv. without serrate bristles or single series of 
serrate spines. 
a*, Posterior pair of spinning-mammille absent or much 
shorter than the anterior pair . . . . . . - ZopaRiip# (p. 53). 
b*. Posterior pair of spinning-mammille not shorter than 
the anterior pair. 
