1907. Carpenter. — Apt era of Lamb ay. 55 



ACHORUTID^E. 



Xenylla humicola (Fab.)— N.W. coast, numerous in October, 1906. 

 As mentioned above, this is an addition to the Irish list. It was 

 added to the British list by Carpenter and Evans in 1899 (Proc. R. 

 Phys. So:. Edinb., xiv.). Its foreign distribution — North Germany, 

 Novaya Zemlya, vSpitzbergen, and Greenland — shows clearly that it 

 belongs to the northern section of our fauna. 



Anurida maritima (Leach).— This familiar denizen of the rock- 

 pools was found abundantly in June, 1906. 



THYSANURA. 

 CAMPODEIDJE. 



Campodea stapylinus, Westw.— Common ill mould under stones 

 both in June and October, 1906. 



MACHILIDJE. 



IVIachills maritima (Leach). — Common under stones above high- 

 water mark, June, 1906. 



Praemachilis hlbernlca, sp. nov. 



(Plate 16). 



Length 12 mm. Eyes twice as broad as long, with a very short median 

 contact (fig. 6). Ocelli widely separated, situated at thel ateral corner of 

 the eye, subquadrate in form (figs. 1, 6). Feelers more than half as long 

 as body, with basal segment twice as long as broad succeeded by a long 

 multiarticulate region after which come seven regions, each composed of 

 three segments. Prothorax produced into large lateral rounded lobes 

 (fig. 1).' Median cercus more than half as long as body, paired cerci three- 

 sevenths length of median (fig. 1). Ovipositor in female extending almost 

 as far as the tips of the stylets. Penis of male not reaching the tips 

 of the lateral processes of the ninth abdominal segment. 



The above characters suffice to distinguish this species from its con- 

 geners. Its nearest ally appears to be Praemachilis italicus (Grassi) 1 , in 

 which the lateral cerci are only one-third the length of the median, and 

 the feelers three-quarters the body-length. P. hibernicus agrees however 

 with P. italicus in the shape and position of the ocelli — a character which 

 is also shared by a Chinese species— P. confucius, Silv. a 



Examinaticu of the jaws of P. hibernicus shows some features of interest. 

 The mandibles have the apical region straight as in Machilis maritima, but 

 the apex is armed with four distinct rounded teeth (fig. 2). The maxillulae 

 are stout (fig. 3) with the galea and lacinia equal in size and evenly 



1 Bull. Soc. Ent. Ital. xix.. 1887, pp. 53-4 : xxi., 1889, p. 5. 

 % Redia. iii., 1905, pp. 229-230. 



