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Show 1890.] ACARINA FROM ALGERIA. 423 Length of legs, 1st and 4th pairs, about -16 millim. „ „ 2nd pair about -14 millim. .> ». 3rd ,, „ "13 ,, Colour red-brown, of moderate depth. Texture rough and dull. Cephalothorax almost conical, considerably arched, bearing numerous irregular, raised, rough dots and short ridges. Rostrum somewhat rounded, rather trifid; one pair of very short curved rostral hairs. Pseudostigmata close to the abdomen, slightly raised. Pseudostigmatic organs very short, with almost globular heads upon peduncles so short as scarcely to be seen. Legs short, the fourth pair not nearly reaching the hind margin; somewhat flattened, rough. The tibiae loug, the tarsi short; most joints have a pair of very short curved hairs near the distal end; claws tridactyle, heterodactyle. Abdomen large in proportion to the cephalothorax, compressed dorso-ventrally. The anterior margin is somewhat truncated, but not straight, the hind margin strongly rounded. The central part of the nofogaster is an elliptical arched lobe or elevation, the exterior margin of which, after attaining its lowest level, turns gently up again and forms a rough irregular edge, from which there is a projection in the centre of the posterior margin. Some very short, rather clavate, hairs project from this margin at regular intervals. Outside the above-named edge is a deep irregular trench which extends all round, except the anterior edge. Outside this, forming the margin of the abdomen, is a broad, slightly arched band or border, which is widest at the posterior margin, and is there fringed with short clavate hairs at regular intervals. Both the central portion of the abdomen inside the trench and the raised border bear conspicuous, rough, raised, irregular ridges; those on the anterior part of the central ellipse are almost transverse, those on the posterior portion strongly bent forward in the middle. The ridges on the border are not continuous with those on the central part, they are much more numerous and are arranged almost radially. I only found a single specimen of this minute creature, which I obtained at Algiers ; its nearest ally is probably Eremceus brevipes^ a British species. C.-ECULTJS SPATULIFER, n. sp. (Plate XXXVII. fig. 7.) Size of the single specimen found :- Length 1 millim. Breadth -60 millim. Length of legs, 1st pair 1 millim. „ „ 2nd and 3rd pairs '70 millim. „ „ 4th pair "80 millim. Colour.-Legs and chitinous plates of the body very dark brown,. almost black; parts where the skin shows between the plates or in articulations lighter yellowish brown. Texture of chitin very rough and dull, of skin finely striated with irregular wavy striae like that of most Sarcoptidas. 29* |