18 ARKIV FÖR ZOOLOGI. BAND 2. N:0 19. 



with four sliort oblique branches on each side. The pubes- 

 cence is for the most part rubbed off, but there are in the 

 middle-line traces of a silvery pubescence and above the 

 whole surface there are long blackish hairs and bristles. 



Mamillce four. Posteriors as long asabdomen, trisegmental ; 

 terminal joint 1 mm longer than both basals taken together, 

 caudiform and attenuate at apex. Anterior mamillae 1 ^2 

 mm long, separate at base V^ longer than one of them. 



Measurements . 



Total length 16 mm 



Length of cephalothorax 6,5 » 



Breadth » » • .... 5,2 » 



Length » sternum ..... 2,8 » 



Breadth » » 2,6 » 



Length » abdomen 7 » 



Breadth » >> 5,5 >> 



Length 1st leg 14,5 » 



» 2d » 14,8 » 



» 3d » 16 » 



» 4th » 19,5 » 



Length of the joints of 1st leg: 2,5 — 1 — 4,5 — 1,8—2,8 — 2,6—1,8 

 » » » » » 4th » 2,6 — 1—5,2 — 2,5 — 3,7 — 4,6 — 2,5 



» » » » » mamillae posteriores: 1,8—1,7 — 4,5. 



Severa] young and adult females from Tatarenda in 

 Bohvia. 



Among the before known species of this genus I. annu- 

 lata seems to be nearest allied to I. siemonsi Cb. The chief 

 distinctions appear by the following table. 



I. siemensi F. O. P. Cb. I. annulata n. sp. 



Cephalothorax broadly margi- Cephalothorax with twolateral 



ned by rufous-yellow hairs. bands of whitish pubes- 

 cence. 



Cheliceres. Outer margin of Cheliceres. Outer margin with 



fang-groove with 10, inner 6 or 7, inner margin with 



margin with 9 stout teeth. 6 st ont teeth. 



Eyes. Anterior centrals half a Eyes. Anterior centrals more 



diameter apart. Central po- than half a diameter apart. 



