A Contribution to the Spider Fauna of Scotland. 123 
Sexual organs.—Palpi—Average measurements from outer side. 
Patella—18 mm. 
Tibia— 22 mm. 
Tarsus—'36 mm. 
The structures at the apex of the palpal organs are characteristic. The 
outer apophysis seen from below is nearly circular, and possesses a small fold 
of membrane on its inner side (see Plate II. figs. 10 and 12). 
The epigyne measures ‘(09 mm. in length by 145 mm. in breadth; its 
structure is characteristic (see Plate II. fig. 8). 
Falces.—In the male sex these are extremely long and divergent. A long, 
strong apophysis is placed in the apicai half of the basal joint, at the inner 
side. Distal to this the article is continued for some distance as a cylindrical 
body. The apophysis bears one very minute tooth near its apex, and there 
is another similar one between the apophysis and the apex of the article. 
In small under-developed specimens the distance between apophysis and apex 
is less than in figure 13, which represents an average well-developed individual. 
T. instabile Camb. occurs in swampy places in the south of England, and 
I have seen specimens from County Carlow in Ireland. 
Theridion bellicosum Sim. 
[Plate II. Figs. 7, 9, 11 and 14.] 
Theridion bellicosum EK, Sim. Aran, nouv., etc., Mém. Soc. Roy. sc. Liége, 
2° mém. p. 106. 
Size.—Total length of male, 1:6 mm.; of female, 1°8 mm. 
Colour. —Carapace — Clear yellow-brown. In the male this may be 
immaculate, or there may be a faint dark marking at the thoracic juncture, 
taking the form of a short triangle with the apex in front. This never 
reaches the ocular area. In the female this mark is better developed, 
though still faint. It generally takes the form of a broad quadrilateral 
almost square patch, scarcely reaching the occiput. In no specimen of 
either sex did this faint mark approach the ocular area. Sternwm—VYellow- 
brown, much suffused with dark brown. Abdomen—The colour is variable, but 
almost always there are traces of a broad, pale, dentated, central, longitudinal 
band. The dentations are generally divided by three or four pairs of dark 
brown blotches arranged longitudinally. The ground colour varies from 
dark brown to yellow-brown. Below, the abdomen is pale yellow-brown, 
with the epigastric area more deeply pigmented. Between this and the 
spinners is an oblong transverse dark patch apparently never triangular. 
The colours are very similar in the two sexes. In spirit the abdomen of 
the female is apt to collapse in the middle line below, producing a deep 
longitudinal furrow. 
