234 ORTHEZIA CATAPHRACTA. 



equal breadth, curved under, the posterior ones only- 

 being a little longer than the others, forming altogether 

 a raised compact border. On the back the segmenta- 

 tion is distinctly visible throughout, the cereous matter 

 taking the form of each segment ; the body in early 

 life flat, afterwards distended; the segment next to 

 the frontal node entire, the rest divided by a median 

 impressed line, on which, in the first three of the 

 divided segments, is a very small scutelliform nodule, 

 and at the end of the line, immediately adjoining the 

 Iamina3 of the circumference, is a short, somewhat 

 elevated lamina arising at the anal orifice and pro- 

 jecting over them. The marsupium is short (varying 

 in length), broad, the posterior angles rounded off ; 

 the upper surface, arising below the circumferential 

 border, but distinctly separated from it, nearly flat, 

 having only eight or nine slightly raised longitudinal 

 lines ; the lower surface, arising at the posterior coxa3 

 and hiding the abdomen, convex, perfectly smooth, the 

 end curved upwards " (Douglas, ' Trans. Ent. Soc. 

 Lond.,' 1. c.). The denuded female, after treatment with 

 potash, is broadly ovate with the extremities equally 

 rounded. Dorsal gland-tracts distinctly separated, 

 broad, and forming a regular transverse series ; 

 glandiferous spines (fig. 12) comparatively short, stout, 

 and bluntly pointed ; dermis between the gland-tracts 

 with spiny hairs and simple spinnerets. Antenna3 

 (figs. 10, 10 a) spinose, of seven or eight joints ; for- 

 mula usually (8, 1) (2, 3) (5, 6, 7) 4, or when seven- 

 jointed 1, 1\ 2, 3 (4, 5, 6). Eyes (fig. 11) very large, 

 tuberculate, curved outwards. Mentum biarticulate, 

 apex with several long, slender spines. Anal orifice 

 with six long hairs ; ring broadly but finely punctate. 

 Ventral spiracles large, broadly dilated externally ; 

 abdominal spiracles (fig. 12) minute, circular, with a 

 concentric series of spinnerets, closely surrounded by 

 glandiferous spines. Legs somewhat sparsely spinose ; 

 coxa very broad ; trochanter very narrow and of 

 almost equal width throughout. 



