30 



Seutovertex 



of fine small hairs on Dors, of Abel, springing from minute papillae. Dors, 

 plate sufflexed. ting, tricl. — Nph. Very like that of S. sculptus, but 

 Psstg. org. shorter. — Im. L. ca, 680 u. 



Aquatic, on fresh-water algae. England. 



4. S. harioti Michael 1891 S.h., Michael in: Miss. Cap Horn, v. 8 p. L59. 



Im. Dark brown; cuticle hard and rough, Cephth. Dors, of Abd., 

 femora and coxae of legs 3, 4 thickly strewn with projecting points which 

 are confluent on Cephth. and ant. part, of Abd., larger, more dispersed, and 

 irregular on remainder of Abd., they are part of the epiostracum and rub 

 off with it. Kost. rounded, Lam. scarcely visible. Cephth. without other 

 markings. Psstg. org. with short peduncle and small globular head. 

 Intlam. hair very small. TJng. large trid., very hetd. Abd. without mar- 

 kings other than the points above mentioned; central part of ant. margin 

 of Abd. projects over Cephth. and coalesces with it. On each side of post., 

 margin of Abd. is an indentation with a spine inserted; 2 longi- 

 tudinal rows of about 3 extremely small hairs on Dors, of Abd. — Nph. 

 Very like that of S. bilineatus, but Intlam. hair very long and thick, flagelli- 

 form. — Im. L. ca. 700 |u. 



On marine algae. Terra del Fuego. 



5. S. maculatus Michael 1882 S.m., Michael in: J. R. micr. Soc, ser. 2 v.2 

 p. 13 t. 1 f. 1— 5 j 1884 S.m., Michael, Brit. Orib., v.l p. 302 1. 18 f. 9— 16 | 1896 

 Ameronothrus m., Berlese, A. M. S., Crypt. II p. 32. 



Im. Dark brown, almost black. Elliptical, rough, covered with raised 

 dots. Lam. and Tiiam. thickened bars. 2 ridges from the 2 Lam. join 

 forming a V the point whereof lies in a semicircular indentation of ant. 

 margin of Abd. Psstg. org. very short with broadly pyriform head. 

 First 3 joints legs covered with raised dots. Dors, of Abd. with arched 

 centre' and broad, flat, peripheral band; all covered with raised dots of even 

 size arranged irregularly on arched part, transversely on ant. margin of Abd., 

 radiatingly on remainder of flattened band; about 10 short knob-headed hairs 

 on hind margin. Ung. trid. — Nph. brown, broad, flat; covered with ridges 

 and wrinkles of the cuticle which are arranged in a definite pattern on Cephth. 

 and ant. margin of Abd., irregularly on remainder of Dors, of Abd. 8 spatulate 

 hairs on post, margin, the 4 central of these the longest. — Im. L. ca, 540 \x. 



On lichen near sea coast. England. 



6. S. sculptus Michael 1879 S. S., Michael in : J. R. micr. Soc, v. 2 p. 242 | 

 1884 S.s., Michael, Brit. Orib., v.l p. 299 1. 18 f. 1— 8 || non 1887 Eremaeus ovalis, 

 Berlese, A. M. S., fasc. 35 nr. 7. 



Im. Dark brown or black. Rost. blunt. Cephth. small, narrow, dotted. 

 Lam. reticulated blades on edge; Clam, long, blunt, curved; Tiiam. 

 a bar. Psstg. org. long, spatulate, rough; legs with femora enlarged, hind 

 ones with blades. Tactile hair of leg 1 set on apophyses. Abd. oval, 

 produced to a long thin point which is anchylosed to Cephth. Edge 

 of Dors, of Abd. rough, post, margin with central lobe and indented on each 

 side of it. A bag-shaped space of clear smooth chitin bordered by a ridge 

 adjoins the centre of ant. margin of Abd.; a triangular dotted space bordered 

 by a ridge lies on each side of the clear space. Central part of Dors, of 

 Abd. irregularly and deeply pitted, lat. parts with small raised dots. 4 small, 

 spatulate hairs on post, margin; a few similar on Dors, of Abd. Ung. trid. 



