TULLGREN, ARANE.E FR. THE GRAN CHACO. 13 



Breadth of abdomen 17 >> 



Length » 1st leg 63 » 



>> » 2nd » 58 » 



» )> 3rd » 53 » 



» » 4tli » 67 » 



Length of joints of 1st leg: 10 — 4 — 17,5 — 8 — 13,5 — 11 — 9 mm. 

 » » ;> » 4th » : 7,5— 4— 17— 8,5— 13,5— 15— 8 mm. 

 Some adult and several young specimens, all collected 

 at Tatarenda in Bolivia. 



2^ote. On some young specimens the pubescence is nearly 

 totally fallen off. On these ones the sigillse on sternum are 

 very distinct (Pl. 1, fig. 2 c). They are eight in number of 

 which the six first ones are very small. The last pair of 

 them is produced through a distinct curved furrow towards 

 the center of the sternum. 



In several points this species agrees with A. cordubensis 

 Til. of which only the male is known. From t hat my spe- 

 cies differs especially through the diagram of eyes. On t hat 

 Mr ThorelP says: »oculis mediis anticis spatio diametrum 

 suam sequante separatis et longius inter se quam a lateralibus 

 anticis remotis, oculis mediis posticis cum lateralibus posticis 

 sub-contingentibus, et a mediis anticis spatiis longitudinem 

 suam vix sequantibus, saltem superantibus, remotis». Besides 

 A. cordubensis Th. has the first and fourth leg equal in length. 

 The most characteristic mark of this species is \Yithout 

 doubt the strong and extraordinary convexity of its sternum, 

 through which it is distinctly separated from A. cordubensis 

 and through which it seems to be very near related to A. 

 sternalis Poc -. From these species it differs through its lar- 

 ger size. These species measures in total length only 38 mm. 

 Cephalothorax is by A. gigantea Tullgr. exceedingly longer 

 than the tibia + patella of first leg and in other parts, be- 

 sides the measurements they are very different. The distance 

 between anterior centrals is not »rather less than their dia- 

 meter». The distance between the two laterals is as long as 

 the diameter of posterior laterals. There is no plumose 

 scopula on the basal half of femur of first legs etc. 



^ Thorell, T., Förteckning öfvev avachnidev från Java jämte 



beskrifningar å några sydasiatiska och svdamerikanska spindlar in Bih. 

 till K. Sv. Vet.-Akad. Handl. Bd 20. Afd. IV, X:o 4, 1894, p. 28. 



- PococK, R. I., On some South- American Aviculariidse in Ann. and 

 Mag. Xat. Hist. Ser. 1, vol. 11, p. 88. 1903. 



