70 
Proceedings of the Koyal Society of Edinburgh. [Sess. 
whether this is merely a sexual ditierence, no similar case being known 
amongst lulids. It has, therefore, been deemed justifiable to consider them 
as specifically distinct. 
Mesoiulus Evansi, n. sp. 
$ ; Length 14 mm. ; diameter 0*87 mm. ; 44 segments, of which 2 
apodous ; 77 pairs of legs. Adult. 
$ : Length 13 mm. ; diameter 0'84 mm. ; 44 segments, of which 2 
apodous; 77 pairs of legs. Adult. 
Length 12 mm.; diameter 0*81 mm.; 41 segments, of which 3 
apodous ; 69 pairs of legs. Adult. 
^ ; Length 16*50 mm. ; diameter 0*97 mm. ; 47 segments, of which 2 
apodous ; 85 pairs of legs. Adult. 
Length 15*50 mm.; diameter 1 mm.; 46 segments, of which 2 
apodous ; 83 pairs of legs. Adult. 
^ : Length ? ; diameter ? ; 44 segments, of which 2 
apodous; 79 pairs of legs. Adult. 
$ : Length 13 mm. ; diameter 0*95 mm. ; 43 segments, of which 3 
apodous; 75 pairs of legs. Adult. 
Colour ochraceous, with dark patches around the repugnatorial pores. 
In some specimens the ventral region is fulvous. A dark band between 
the eyes. Legs pale. 
8: Head smooth. Four supralabial setse. Two occipital setae. No 
occipital sulcus. Antennae short. Eyes composed of somewhat flattened 
and not very distinct ocelli numbering 25 to 30. Mandibular stipe, 
though destitute of any characterised lobe, is nevertheless larger than 
in the female, and shows a subquadrangular outline. Gnathochilarium 
with groups of few short setae behind the middle. 
Collum rather short, with triangular lobes, the anterior margins of 
which are broadly excised. No longitudinal sulci on the surface. 
Prozonites without special structure. Suture thin, yet well marked all 
around the somite. Longitudinal sulci of metazonites fairly regular, not 
reaching the posterior margin, wide apart. Pores opening behind the 
suture on the 6th and 7th segments, gradually more remote backwards 
so as to stand far behind the suture (on about the first third of the 
metazonite) ; their distance from the posterior margin covers 3| to 4 
intersulcal spaces. Posterior margin without setae, but with an incon- 
spicuously striate, narrow rim. Last segment rounded ; the posterior half 
of its surface bears fairly numerous and long setae ; so do likewise the 
