124 Proceedings of the Royal Physical Society. 
Proportions.—Average height of clypeus in male, ‘23 mm. 
Seen in profile the carapace of the male forms a fairly regular curve, the 
occipital dip and sudden rise of caput not being present. This, however, is 
probably rather variable. 
Sexual organs.—Palpi—A verage measurements from outer side. 
Patella—13 mm. 
Tibia—19 mm. 
Tarsus—31 mm. 
The external apophysis at the apex of the palpal organs is far from 
circular, in most positions appearing more pointed. 
Epigyne—This measures ‘04 mm. long and ‘07 mm. broad. It is thus 
less than half the size of that of 7. instabile Camb. Its structure, too, is 
markedly different (see Plate II. fig. 7). 
Falces.—In the male sex these are only slightly divergent, and much 
shorter than in 7. instabile Camb. There is a large apophysis on the inner 
side of the basal joint, near the apex. This bears two or three teeth. 
Another tooth is placed between the apophysis and the apex. These 
teeth are actually larger than those in the bigger species, 7. instabile. 
Distal to the apophysis the article slopes rapidly and obliquely to the 
apex, some variation in the rapidity of the slope being observable. 
Both sexes of 7’. bellicosum Sim. were found on Beinn-a-Chuallaich, on 
June 12th, at about 1700 feet. On June 15th, females occurred on Ben 
Nevis. In both localities the specimens were found under stones, the 
females carrying about their spherical white egg-sacs attached to their 
spinners. 
The two species then differ in size, colour, proportions (the smaller one 
having actually a higher clypeus than the larger one), palpi, vulve and 
male falces. They differ equally in habits, one living in the southern 
marshes and the other on the bare Scottish mountains. 
Mr Simon has kindly examined both forms for me and states that 
the smaller one is identical with his TZ. bellicosum. This was also 
Professor Kulezynski’s belief, but he informed me that it was also his 
T. lepidum Walck. of the Aranew Hungarie. I think, from Dr de Lessert’s 
figure in Catalogue des Invertébrés de la Swisse, there is no doubt that 
his 7. lepidum Walck. also represents the form here called 7. bellicosum 
Sim. 
7. instabile Camb. is recorded from the Lake District of North Lancashire 
and from St Kilda. I have never seen these specimens so am unable to say 
to which form they belong. 
