760 MS. *. o. tioEABD oAitBaiDdii olf [June 16, 



thoracic striae well marked. Ocular tumtilus three times as long 

 as wide. Anterior central eyes less than a radius apart, and from 

 the anlerior 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 tliat 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., iii., iv. weU marked, 

 subinarginal. 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 

 jiroduced, 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., iii., iv. not spinose. Tibia) i. 

 and ii. with a few spines beneath ; iii. and iv. with a few spines 

 at the sides and s])iniform 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 denticles. 



Abdomen similar in general character to that of M. sanguineus. 

 Mamilhv 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. — J . 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 examples 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 



' 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 tlie anterior centrals. 



