from the Lo)i:er Amazons cC'c. 79 



inner side with 3 small denticules. Spinners 6, anterior pair 

 and posterior pair two-jointed. 



Yulva consisting of a broad dark clutinous plate, emar- 

 ginate before, broadly truncate behind (towards spinners), 

 with two curved yellow side-pieces. 



Measurements in miJlim. — Tot. len. 40, carap. 15*75 ; 

 legs i. 62-5, ii. 59, iii. 47-5, iv. 62*5 ; pat. + tib. i. 26, iv. 19, 

 iii. 15. 



A single female of this species, the largest of the group 

 met with, was taken by myself in the forest near Santai'em. 

 It was started from the palm-leaf thatch of a hut in the 

 forest, in which we had taken refuge from the rain, by my 

 companion Mr. T. Wallace, Jun. Its attitude, crouched 

 down flat upon the surface with legs extended, made it 

 appear, at 6rst sight, to be a gigantic specimen of the ubi- 

 quitous H. venatoria. 



Ctenus Andrewsi^y sp. n., ?. 



Hub. Santarem and Pari Forest. 



Type in coll. Brit. Mus. Nat. Hist. London. 



$ . Length 32 mm. 



Colour the same as in ReiJyi^ except that the abdomen 

 has a dorsal series of three conspicuous and three smaller and 

 less conspicuous spots on each side of the central line. 



Vulva longer in proportion to its breadth. Lateral curved 

 side-pieces absent, their place taken by a black tubercle sur- 

 mounted by a sharp black spur. 



Measurements in millim. — Tot. len. 32, carap. 12'25 ; 

 legs i. oQj ii. 51"5, iii. 42'5, iv. 56; pat.+tib. i. 20, iv. 16, 

 iii. 12"25. 



Two females were taken from the hollow stem of a decayed 

 palm-tree in the forest close to Para, near theCasa da Oleria. 

 Both of them had a large dull white egg-sac attached to the 

 inner surface of the hollow stem. Tliis form is evidently 

 very closely allied to Reidi/ij but, seeing that the two speci- 

 mens irom Para were evidently fully adult, the differences 

 are not merely those due to immaturity, as one would liave 

 otlierwise suspected. I shall be surprised if fresh material 

 does not contirm the specific difference between the two forms, 

 though it is never safe to prophecy without being in posses- 

 sion of the facts. A third example was taken in the forest 

 near Santarem, wandering about some wooden palings close 



* I have much pleasure in naming this form after my friend Mr. T. An- 

 drewf?, who contributed not a little to the general success of our scientitic 

 investigations. 



