144 PARLATOR1A PEBGANDII. 



opaque, and of a dull ochreous or smoky yellow ; and 

 rough in texture. Underside trough-shaped, with 

 broad, flat, lateral margins. Ventral scale complete, 

 white or dusky white. 



Long. 1 1'75 mm. 



Adult female (PL XXX, fig. 1) nearly as broad as 

 long ; usually of a translucent mauve or pale purple, 

 with the pygidium yellowish ; eye- spots dark pur- 

 plish ; and the dark colour of the eggs readily shows 

 through the dermis when ready for extrusion. Young 

 adults are frequently quite colourless. Rudimentary 

 antennae near the margin. Marginal spine placed as 

 in P. proteus. Rostral filaments extending to the 

 middle of the body. Margins of abdominal segments 

 with many short tubular spinnerets. 



Pygidium (PL XXXIII, fig. 1) with four groups of 

 circumgenital glands, which do not vary to any great 

 extent, as will be seen by the formula of the ten exam- 

 ples given below : 



68 . 66 . 67 . 77 . 66 

 89 . 87 . 68 . 66 . 67 



98 . 66 . 810 . 76 . 66 

 76 . 66 . 7 7 . 66 . 66 



Margin with three pairs of well-developed, subequal, 

 and strongly trilobate lobes, the bases of which are all 

 suddenly narrowed ; fourth pair rudimentary, and 

 usually pointed or tridentate, and occasionally are so 

 minute as to appear as a thickened margin of the body- 

 wall ; a spine indicates its position, which, when stand- 

 ing erect, might easily be mistaken for a pointed 

 process on the lobe itself. There are two plates 

 between the median and second pair of lobes ; three 

 between the second and third pair, which, with the 

 exception of the fifth, are identical in form ; like those 

 of P. proteus they are slightly divergent and deeply 

 fringed, but the apical serration is less pronounced 

 than in the latter species; the three plates between 



