Scutovertex 29 



Body rough and sculptured, dors, surface of Abd. not wholly divided 

 from Cephth., but joined by a central projection or otherwise. 



6 good and 1 doubtful species. 



Key to the good species. 

 \ Terrestrial 2. 

 \ Aquatic 4. 



f Lam. blade-like; C. lam. large, rounded 3. 

 \ Lam. a mere thickened bar, no C. lam. L. 540 |u 5. S. maculatus . p. 30 



I Ung. trid. L. 600 n 6. S. sculptus . . p. 30 



\ Ung. mond. L. 500 |u 2. S. caelatus . . p. 29 



i Psstg. org. with short peduncles and small globular 

 4 -j head; Ung. trid. 5. 



I No Psstg. org. visible; Ung. mond. L. 620 |n . . 1. S. bilineatus . . p. 29 



{Markings on Dors, of Abd. ridges usually more or 

 less zig-zag; 6 hairs on post, margin of Abd. but 

 no indentations. L. 680 in 3. S. corrugatus . p. 29 



Markings on Dors, of Abd. projecting points, coalescing 

 near ant. margin of Abd.; 2 indentations in post, 

 margin of Abd. a spine in each. L. 700 |u . . 4. S. harioti ... p. 30 



1. S. bilineatus Michael 1888 S. b., Michael, Brit. Orib., v. 2 p. 571 t. 54 

 f. 8-16 1 1896 Ameronothrus b., Berlese, A. M. S., Crypt. II p. 32. 



Im. Dark brown ; dull, rough, rather like S. maculatus. Host, blunt ; 

 Maxillae with a single median indentation and a small black denticle in 

 the depression; Lam. thick, ill-defined ridges, usually with a similar Trlam. 

 Surface of Cephth. covered with raised dots. No Psstg. nor Psstg. org. 

 Abd. elliptical, with 2 large longitudinal, broken, irregular ridges on Dors, 

 of Abd. sometimes absent, 2 or 3 very irregular transverse ridges anteriorly 

 and posteriorly and raised dots like those on Cephth., but a little larger. 

 Ung. mond. - - Nph. very like that of S. sculptus but no Psstg. ' org. - 

 Im. L. ca. 620 |u. 



Aquatic, on fresh-water algae. England. 



2. S. caelatus Berl. 1895 B.C., Berlese, A. M. S., fasc. 74 nr. 1. 



Im. Lightish smoky brown; dull, rough. Lam. very slightly raised; 

 Trlam. mere line; C. lam. very long and large, widest at distal ends 

 which are rounded. Psstg. org with thin peduncle and strongly clavate 

 setose head. Kost. dotted, vertex with irregular vermiform striae; Abd. 

 flatish, reticulated, elliptical, very slightly truncated anteriorly. 3 very small 

 projections from post, margin, the 2 lat. bearing minute hairs, 2 pairs 

 similar on lat. margin. Legs rough, apophysis on tibia 1 very long. Ung. 

 mond. L. ca. 500 |n. 



In moss. Northern Italy. 



3. S. corrugatus Michael 1888 S. c., Michael, Brit, Orib., v. 2 p. 567 t. 54 

 f. 17 j 1896 Ameronothrus c., Berlese, A. M. S., Crypt. II p. 32. 



Im. Dark brown; dull. Cephth. short. Rost. blunt, slightly trifid. 

 Lam. straight ridges. Psstg. org. small with short peduncle and head which 

 looks globular, but is cup-shaped if magnified sufficiently. Dors, surface of 

 Cephth. with several irregular ridges. Abd. rounded posteriorly. Dors, of 

 Abd. slightly arched with numerous irregular ridges, mostly longi- 

 tudinal with short tranverse branches, rarely straight; 4 longitudinal rows 



