OCR Text |
Show 760 MR. P. O. PICKARD CAMBRIDGE ON [June 16 thoracic striae well marked. Ocular tumulus 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, pyriforni, half their axis from anterior centrals, in contact with posterior laterals. Axis of posterior laterals more than half as long as that of anterior laterals, less than half their short diameter from them1. 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., iii., iv. well marked, submarginal. Labium broader than long, not cuspidate. Coxa 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 base 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., hi., iv. not spinose. Tibiae i. and ii. with a few spines beneath; iii. and iv. with a few spines at the sides and spiniform hairs below. Protarsi i. and ii. with 3-4 spines respectively beneath ; on iii. and iv. more numerous. Tarsi short, slightly curved, transversely striate above; i. and ii. scopulate ; iii. 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. Mamillae 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. Comparative measurements In millimetres.- 2 • 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. 30-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. Many exam pies 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 m e 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. |