2o8 The Scottish Natiiralist. 



Shetland ; very numerous on the surface of a pool of stagnant 

 water at Bressay. 



ACHORUTES (Tempi.) 



19. A. viATicus Tullb. 1. c. 50, 52, tab. x., figg. 7-20. 



Obsctire nigro-cyanetis, pilis albis rigidis ; ocellis in macutis obscurioribiis ; 



fiirculae mamibrio dentibusfere breviore, dentibiis apiceni versus parum acwnin- 



atis et imuronibus circiter trip to tongioribus, his gracitibzis, leviter exciirvatis ; 



spinis aitatibiis papiltis cojiicis, quibiis affixae sunt, pautto tongioribiis. Long. 



1-2 mm. 



Bressay, Shetland ; very numerous with the preceding species. 

 Kirkwall, Orkney ; creeping on the bark of ash-trees. 



ANUROPHORUS (Nic.) 



20. A. LARicis Nic, Tullb. 1. c. 53, 62, tab. xii., figg. i, 2. 

 Lipiira corticina Bourl., Lubb. 1. c. 191, tab. xlv. 



Kirkwall, Orkney; in large quantity on the bark of elm and 

 ash trees in the garden of the Queen's Hotel. 



ANURIDA Laboulb. 



21. A. CRASSICORNIS, n. sp. 



Obscure nigro-cyanea, dense tongiiis atbopitosa ; ocdtis qziinqiie nigris ; 

 antennis brevibus et crassis, capitis tatittidine magis cjnam dnpto brevioribzis, 

 articulis praesertim priznis fortiier transversis ; capite snbtus marginibus ct 

 apice nee nan ungtiicutis tarsorum albicantibiis. Long. 1^-2^ ifim. 



Many specimens under stones in the river Tay, near Perth, 

 June 29. 



Very like and allied to Anurida niaritima Guer., Laboulb. in 

 Ann. Soc. ent. de France, Ser. iv., Tome iv., pag. 708, Tab. ii., 

 but differing by its much shorter and thicker antennae, by the 

 structure of the head (the inter-antennal lobe is pentagonal with 

 almost straight sides, and is very well separated from the rest of 

 the head, and projecting), and lastly also by the more robust 

 body. 



THYSANUKA. 



22. Machilis maritima Leach, Lubb. 1. c. p. 237. 



Very common among Fuais, Sic, on the sea-shores of Shetland 

 and Orkney. 



Helsingfors, Finland, November i, 1879. 



