ASPIDIOTUS FIOUS. 105 



tion (PL I, fig. 9) ; the thoracic segments converging 

 towards the apex of the pygidium. Rudimentary an- 

 tennae with a short spine; and there are two similar 

 spines on the margin in front. Rostrum extending a 

 little beyond the second pair of spiracles. Thorax with 

 a short spine (PL I, fig. 11), which does not appear 

 very highly chitinised, and often disappears in the 

 process of mounting. Free penultimate segment of 

 abdomen, with a group of 8 9 tubular spinnerets con- 

 nected on the dorsal surface with the same number 

 of elongated pores. Pygidium (PL II, fig. 2) very 

 large, with four groups of circumgenital glands ; upper 

 lateral groups of 4 8 ; lower laterals of 2 4. Dorsal 

 tubular spinnerets slender, very long, some of them 

 extending into the last free abdominal segment; the 

 connecting dorsal pores are arranged in two double, 

 subdorsal rows, and number about 15 18 in each 

 group. There are four basal scars, equidistant, and 

 transversely placed. Anus about twice its length 

 within the margin. Vaginal opening a little beyond 

 the centre. Margin (PL XI, fig. 2) with three pairs 

 of well-developed- subequal lobes, each emarginate or 

 notched on its outer lateral margin. There are two 

 plates between the first and second lobes; three be- 

 tween the second and third ; and three beyond. The 

 first six are similar, and have a deep sharp fringe ; the 

 seventh irregular, furcate, and broad at the base ; the 

 three last similar, each with a deep central cleft, the 

 inner portion either simple and spine-like, or with one 

 or more irregular serrations ; anterior half with a deep 

 blunt fringe. Beyond the latter the margin is very 

 finely serrate, and has a single projecting spine. 



Immediately within the margin are ten club-shaped 

 glands, arranged in irregular pairs, each, with the ex- 

 ception of the fourth, connected with minute pores on 

 either side, at the base of each lobe. Each lobe is 

 followed by a short spine, and there is one arising from 

 the centre of the base of the second and third lobes. 



Scale of the male (PL I, fig. 12) short, ovate; sides 



