62 ARANEIDEA. 
Subfam. CORINNINAL. 
Spinners with a very short conico-convex terminal segment only. The apex of the maxillz furnished on the 
inner side with a tuft of incurving hairs, and beneath this a thick row of short, stiff, densely clustered 
bristles. Lateral eyes often (Déestus and some Corinne) set on tubercles. Mandibles robust, often 
gibbous above, sometimes immensely developed in the male sex (Megalostrata). Sternum with a reflexed 
margin in front, sometimes all round. Central spinners cylindrical (Corinna), or longitudinally compressed 
(Trachelas). Carapace, mandibles, and sometimes the sternum and legs, rugulose, granulose, or rugulo- 
granuloso-impunctate. Legs more or less spinose (Corinna and Megalostrata), or entirely without spines 
(most 7'rachelas). Tibiz and protarsi, and often the tarsi of i. and ii., with more or less numerous cuspules 
beneath. Tibi i. and ii. (except in Zrachelas) with three, four, or five pairs of spines beneath ; protarsi 
i. and ii. with two pairs, and often with a single apical spine. Tarsi, and apex at least of protarsi, more 
or less scopulate. Claw-tuft consisting of a dense cluster of scopuliform hairs. 
GENERA. 
I. Maxille more or less rounded, not dilate at the apex nor concave on 
the outer side. Posterior row of eyes procurved. Central pair of 
spinners more or less cylindrical. Legs more or less spinose. 
A. Eyes of the posterior row equidistant, or centrals further from 
each other than from the laterals. Mandibles of the male with 
3 large teeth only on the lower margin . . . . . . . . Meceatosrrata, Karsch. 
B. Eyes of the posterior row not equidistant, centrals further from 
the laterals than from each other. Mandibles of the male with 
4-5 teeth on the lower margin . . . . . 2. 1 ee. Corinna, C. Koch. 
II. Maxille long, straight, concave on the outer side, dilate at the apex. 
Posterior row of eyes recurved. Central pair of spinners longi- 
tudinally compressed. Legs almost entirely devoid of spines . . Tracuetas, L. Koch. 
MEGALOSTRATA. 
Megalostrata, Karsch, Zeitschr. fir Naturw. lili. p. 377 (1880). 
Delozeugma, O. P.-Cambridge, Biol. Centr.-Amer., Arachn. Aran. i. p. 105 (1893). 
Type UM. venifica, Karsch, 3. Costa Rica. 
The chief characteristic of this genus lies in the enormous size of the mandibles in 
the male sex. The lower margin of the fang-groove has three teeth, and the fang itself 
is furnished sometimes with a tooth on the underside near the base. Otherwise 
there is little difference between Megalostrata and Corinna. The lower margin of the 
fang-groove in the immature female has five teeth. 
The four species may be recognized by the following characters :— 
Males. 
A. Fang of mandible with a longer or shorter, stout conical tooth near 
the base beneath. Tibial spur of the palpus simple, rounded, not 
bifid. 
1. The two teeth on the base of the mandible beneath situated nearer 
together, by less than (about half) the length of the anterior 
