760 MR. F. 0. PICKARD CAMBRIDGE ON ~ [June 16, 
thoracic strie well marked. Ocular tuwmulus three times as long 
as wide. Anterior central eyes less than a radius apart, and from 
the anterior laterals their diameter distinctly less than the axis of 
the anterior laterals. Posterior centrals the smallest, pyriform, half 
their axis from anterior centrals, in contact with posterior laterals. 
Axis of posterior laterals more than half as long as that of ante- 
rior laterals, less than half their short diameter from them’. 
Anterior row straight. 
Mandibles parallel-sided. Fang-groove armed on the inner 
margin with a row of 12 stout conical teeth (the number varies). 
Outer margin fringed with rufous hairs, bearing towards their base 
6 separate isolated hairs, thickened towards their base. 
Sternum longer than broad. Sigilla i., ii., ii., iv. well marked, 
submarginal. Labiwm broader than long, not cuspidate. Coaa of 
pedipalp twice as long as wide. Anterior basal angle cuspidate (as 
in M. rufescens and M. sanguineus). Anterior apical angle slightly 
produced, not cuspidate. Inner side of joint bearing towards the 
base a series of 7 stout, curved spines, and one smaller one on the 
central ridge; these, together with the thickened hairs on the 
hase of the mandible, constitute the “lyra” and “ pecten ” of the 
stridulating-organ. 
Legs similar in general character to those of M. sanguineus. 
Femora not spinose. Patella i., ii., i1i., iv. not spinose. Tibie 1. 
and ii. with a few spines beneath; iii. and iv. with a few spines 
at the sides and spiniform hairs below. Protarsi i. and i. with 
3-4 spines respectively beneath; on ii. and iv. more numerous. 
Tarsi short, slightly curved, transversely striate above; i. and ii. 
scopulate; ill, and iv. not scopulate. Tarsal claws 3; superior 
pair with a double series of 6-7 denticles beneath. Tarsus of 
pedipalp with a single claw, armed beneath with a single row of 5 
or 6 denticles. 
Abdomen similar in general character to that of M. sanguineus. 
Mamille four: posterior pair a little longer than abdomen; all 
three joints equal in length; anterior pair half as long as the 
basal joint of the superior pair, less than the length of one of them 
apart. 
Comune measurements in millimetres.— Q. Carap. 9 long., 
8 lat. Abd. 11 long., 6°5 lat. Cephl. area 5°5 long. Stern. 4°5 
long., 3°5 lat. Coxa of pedipalp 3 long., 2 lat. Pedes, long. 
i. 830—ii, 29—iii. 27—iv. 34. Artl. i. long. 4:°25—2—7-5—3-25 
—5:5—5:5—3. Artl. iv. long. 3-5—1°75—8—3—6—8—4. Postr. 
mam. 12 long. Artl.4—4—4. Antr. mam. 2 long., 1°5 sept. 
Manyexamples of the female sex only were obtained under logs in 
the forest near Santarem. The web is of the “ Agelenoid ” type, and 
is often constructed under banks along the bridle-tracks, assuming 
1 The measurements of the eyes are very untrustworthy, for they vary with 
almost every specimen. One female before me has the right anterior lateral 
eye entirely obsolete, while the area where it would normally be placed shows 
no trace of the organ. The right posterior lateral has at the same time an axis 
longer than the diameter of the anterior centrals. 
