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Arena Fauvel is represented by a single species from Europe. We cannot place it in the key on the basis of existing descriptions.

Paractocharis Cameron was described on the basis of a single species from Singapore. It cannot be placed in the key from the original description.

Halmaeusa Keissenwetter. This genus was formerly called Antarctophytosus. Six species have been described, all confined to the sub Antarctic islands. According to Steel (1964) 'Halmaeusa occurs in a variety of habitats, in litter, amongst vegetation, under stones, etc., and only occasionally on the shore'.

Corallis Fauvel. The single species, C. polyporum Fauvel, was described from Aru. It is 2 mm in length and reddish brown in color. Fauvel stated that the woolly pubescence is remarkable in that it does not exist in this degree on other submarine insects.

Phytosus Curtis. Twelve species have been described from Europe, North and West Africa and New Jersey. Some of the European species are not rare but the single American species has been found only once. These are small linear black-to-orange insects which are largely submarine in habits. The anterior and middle tibiae are armed with spines.

Thinusa Casey. Only two species of this genus are known. Both are found on the sandy beaches of Pacific North America. In California T. maritima Casey can be found in numbers at night on certain beaches on the wet sand during an outgoing tide in company with Thinopinus pictus LeConte and Pontamalota opaca LeConte. It is found rarely in seaweed. It is a tiny linear insect largely black with the abdominal apex paler. Its range extends to Washington. T..f1etcheri Casey is a little larger than T. maritima. It is reported from British Columbia to Alaska. The tibiae bear spines on the outer edge. The genus was revised by Moore (1956a).

Liparocephalus Mäklin. Members of this genus live in rock crevices on rocky headlands subjected to heavy surf. L. cordicollis LeConte is known from Monterey, California to Alaska where it is usually found in company with Diaulota densissima Casey. L. brevipennis Miiklin is from Alaska and L. tokunagi Sakaguti