WITH DESCRIPTIONS OF NEW SPECIES 3 1 



Scolopendrella subnuda Hansen. (PI. I., figs 10-13.) 



Hansen, Quarterly Journal of Microscopical Science, xlvii., 

 pp. 70-72, pi. 6, figs. 2a-2g, 1903. 



This is the first British representative of Hansen's second 

 division of the genus, characterised by having the hind 

 margins of the scuta simple, instead of with longitudinally 

 striate belts as in notocantha, the only representative of the 

 first division ; but like that species those of group II. possess 

 twelve pairs of well-developed legs, the first pair containing 

 three free and distinct joints, excluding the trochanter, and 

 the tarsus terminating with two conspicuous claws. 



Group II. is composed of three species, microcoipa Muhr. 

 sharply separated from the other two by having the antennal 

 setae thickened and distinctly pubescent, subnuda Hansen, 

 and silvestrii Hansen. 



Subnuda is a minute species rarely longer than 1.5 mm., 

 and is easily recognised by the very few setae at the margins 

 of the scuta, the form of the cerci, which are also sparsely 

 spinose, and by the form of the legs. The legs of the last 

 pair have but a single prominent dorsal seta on both the tibia 

 and meta-tarsus, whilst the tarsus has one protruding dorsal 

 seta at the middle, and a shorter sub-apical one. The first 

 pair of legs are half as long as the second, and the anterior 

 claw is well-developed, much-curved, and nearly twice the 

 length of the inferior claw. 



Distribution. — In February, 191 1, I found a single specimen 

 of this minute form under a stone on the sea-banks, at Hart, 

 near West Hartlepool, and on May 20th had the good fortune 

 to discover another example which occurred under a deeply 

 embedded stone in a large wood on the banks of the Wear 

 between Leamside and Durham. I have a third example 

 taken near Hylton with £. vulgaris, and have more recently 

 obtained a specimen from under a stone near Brodick on the 

 Isle of Arran, Scotland, and several specimens from a quarry, 

 Penshaw, 191 1.* Hansen described the species from six 

 * Several on banks of the Wear near Washington, Oct., 191 1. 



