MICRATHENA, 
Females. 
A. Vulval scapus having a deep concavity on each side at the apex. 
a. Abdomen with six spines. 
a’. Spines much larger in proportion, especially the posterior 
6’. Spines much smaller, minute, and recurved . 
b. Abdomen with ten to twenty or more spine-bearing tubercles. 
a*, Abdomen with ten sharp spines set on large tubercles. No 
tubercle immediately above the spinning-tube . 
b*. Abdomen with twenty or more tubercles, set with short 
spines. A large tubercle immediately above the spinning- 
tube behind . oe Le ee 
B. Pil al scapus without a concavity on each side at the apex. 
i. Abdomen with a pair of anterior marginal spines directed 
forwards over the carapace. 
* Posterior spines on the abdomen forming a compressed lobe, 
with from three to four spurs. 
a°, Posterior lobes of the abdomen trifid, with three spurs ; the 
lateral margins bearing three cusps soe 
6°. Posterior lobes of the abdomen quadrifid, with four spurs ; 
the lateral margins bearing two cusps . 
** Posterior spines on the abdomen not forming compressed 
lobes. 
a‘, Posterior spurs of the abdomen themselves bifid or trifid. 
a’, Posterior spurs themselves bifid, with often a third 
minute spine remote from the apex, behind and 
beneath. 
a’. Four lateral marginal spines on the abdomen; 
branches of bifid spur equal in length . 
6°. One lateral marginal spine only on the abdomen ; 
lower branch of bifid spur smaller than the other 
6°. Posterior spurs of the abdomen themselves trifid or 
tridentate. 
a". Lower spine of the posterior spur very small and 
remote from the other pair , ee 
6". Lower spine of the posterior spur situated close to the 
base of the middle spine, often strongly deflected 
outwards . Loe ee . . 
. Posterior spurs of the abdomen simple, neither bifid nor 
trifid. 
a’. Abdomen with ten spines, a pair of anterior marginal, 
anterior dorsal, median dorsal, posterior dorsal, and 
postero-inferior dorsal spines . . . . . 1 se 
en 
striata, sp. n. 
spinulata, sp. n. 
gracilis, Walck. 
mammillata, Butl. 
triserrata, Sp. i. 
guadriserrata, sp. i. 
serrata, sp. 0. 
inequalis, sp. 0. 
subspinosa, sp. ni. 
12-spinosa, O. P.-Cambr. 
schreibersi, Perty. 
