lf^90.] ACARINA FROM ALGERIA. 423 



Length of legs, 1st and 4th pairs, about -16 millim. 

 „ „ 2nd pair about -14 millim. 

 j> 55 ova ,, „ ' Lo ,, 



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. 



Lcffs short, the fourth pair not nearly reaching the hind margin ; 

 somewhat flattened, rough. The tibiae long, 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 notogaster is an elliptical arched lobe or elevation, the ex- 

 terior 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. Eoth 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 hrevipes^ 

 a British species. 



Cjeculus sPATTJLiFEE, 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 mUhm. 

 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 duU, of skin finely striated 

 with irregular wavy stris like that of most Sarcoptidce.. 



29* 



