142 Transactions. — Zoology. 



the tubercles are visible in dorsal view, as the abdomen is not 

 produced cylindrically as in S. fagi. Feet entirely absent. 

 Antennae atrophied, simply irregular rings bearing hairs. Men- 

 turn dimerous. Spinnerets of two kinds, some simple and 

 .circular, others figure-of-8 : these last seem to be more nume- 

 rous, especially on the dorsal thoracic region, than in S.fagi. 



Female of second stage, larva, and male not observed. 



Hab. In New" Zealand, on Corokia cotoneaster, a twisted 

 shrubby plant in river-beds, Eeefton district. 



The distinction between this and the last species, at least 

 as far as the adult female is concerned, is marked by the form 

 of the test, the position of the tube, and the absence of the 

 second pellicle. 



Genus Ehizococcus, Signoret. 



Rhizococcus totarse, sp. nov. Plate VI., figs. 1-11. 



Adult female naked, dark-brown, elongated, at first ellip- 

 tical but later somewhat shrivelled ; length about ^-^in. ', 

 cephalic region proportionately large, smooth ; body tapering 

 to the abdominal extremity with conspicuous segments ; anal 

 tubercles distinct, but small, with very short setae. Antennae 

 of six (frequently five) subequal, rather thick, joints, the last 

 bearing several longish hairs. Feet normal ; tibia shorter 

 than the tarsus ; all the digitules are fine hairs. Anogenital 

 ring simple, with eight hairs. On the edge of the body a row 

 of short, strong, conical spines. 



Female of second stage usually red, sometimes green or 

 yellow ; elliptical, convex above ; general form normal of the 

 genus, segmented ; length about ^^gin. ; there is a slight 

 white meal on the surface. Anal tubercles conspicuous, seti- 

 ferous. Cephalic segment rather large. Antennae of six sub- 

 equal joints, the last l^earing some hairs. Feet rather thick. 

 Mentum dimerous. On the edge of the body a number of 

 strong conical spines, from which spring very short curly 

 tubes. 



Larva yellow, flattish, elliptical, segmented ; length about 

 Jjjin. Anal tubercles not very conspicuous, setiferous. Ce- 

 phalic segment large. Antennae proportionately long, with 

 six subequal joints, the last hairy. Feet also long; femur 

 rather slender. On the edge a number of strong conical 

 spines, which give to the margin a toothed appearance. 



Male unknown.''' 



Hah. In New Zealand, on Podocarims totara, and some- 

 times on Fagiis meiLiicsii, near Eeefton. 



* Since this paper was written I have found the male of R. totarce. 

 The sac is snowy-white, of very loose texture. The description will be 

 given in a future paper. 



