Nothrua 



71 



5. N. biverrucatus 0. L. Koch P1840 X. angulatus, ('. L. Koch, C. ML A., 

 fasc. 29 1. 14 | 1840 X. biverrucatus, O.L. Koch, C. M. A., fuse. 2!) t. 15 | 1888 X b.. 

 Michael. Brit. Orih., 0.2 p. 510 t. 47 A f.6— 10 | V1855 X. horridus, Nicole! in: Arch. 

 Mus. Paris, r, 7 p. 450 t. 7 f.4 ] P1885 N. h., Berlese, A. M. S.. fasc. 17 nr. I. 



Im. Very like N. horridus but larger, heads of Psstg. org. less globular, 

 and flat projection below post, margin of Abd. with a large truncated tubercle 

 at each post, corner bearing a minute sharply curved hair in the centre of 

 distal surface. L. ca, 1 mm. 



England. Germany, France?. Italy?, Sweden. 



6. N. echinatus C. L. Koch 1835 X. e., 0. L.Koch. CM. A., fasc 2 t. 17 

 1882 X. ansatus, Haupt in: Her. Ces. Bamberg', r. 12 p. 24. 



Very like N. spinifer, but Abd. longer and bifurcating at post, end 

 so as to form 2 conical tails, as in N. segnis, when that species is carrying 

 the post, part of the nymphal skin of Dors, of Abd. 



In moss etc. Germany. 



7. N. excisus Hanks 1895 X. c, Panks in: Tr. Amer. ent. Soc, 0.22 p. 15. 



Im. Apparently intermediate between N. segnis and N. bicarinatus. 

 Pale brown, Cephth. truncate anteriorly. Psstg. org. short, capitate; Abd. 

 flat without raised margin; truncated anteriorly, deeply emarginate 

 posteriorly; a rough clavate hair on each post, angle, a sub-clavato 

 hair just ant. to angle; a pair of shorter clavate hairs in centre of post, 

 margin. A sub-median ridge each side from near ant. margin, which near 

 post, margin curves outward to lat. angle; where curve starts is a trans- 

 verse ridge; 3 or 4 short clavate hairs on each lat. margin. Ventr. surface 

 and legs rough; numerous curved stiff hairs on legs. Most hairs on body 

 finely serrated. Ung. trid. L 700 |u. 



On bark of spruce firs. New York state. 



8. N. flagellatus Berl. 1888 X. f., LVrlese in: Bull. Soc. ent. Ital., v. 20 p. 210 

 t. 13 f. 5. 



Im. Earthy-brown. Abd. almost quadrangular, elongated, concave; 

 margins raised, with 4 transverse ridges on them; post, margin with a central 

 incision its whole depth, a tubercle projects at eacli side of the incision 

 forming a prolongation of it; each tubercle bears a strong pectinated 

 hair almost as long as Abd. but sharply recurved toward distal end: 

 this hair directed transversely; one other pair of similar but shorter hairs 

 on post, margin directed backward. L. ca. 70<> |u. 



Under bark of trees. Argentina (Buenos-Ayres). 



9. N. glaber Michael 1888 X. g., Michael, Brit. Orib., r.2 p. 525 1896 Angelia 

 glabra, Berlese, A. M. S.. Crypt. II. p. 26. 



Im. Like N. tardus, but larger, smooth without reticulations ; Eost. more 

 pointed and ant. margin of Abd. without projecting corners. — Nph. Like 

 Im., but lighter. — Im. L. ca. 600 \x. 



Amphibious, in moss and sphagnum. England. 



10. N. horridus (Herm.) 1804 Xotaspis h., Hermann. Mem. apt., p. 90 t. 6 f. 3 

 | 1842 Xothrush., C.L.Koch, fibers. Arach.. p. 3 p. 113 | 1888 X. h., Michael, 

 Brit. Orib., c.2 p. 503 t.47 f. 1-4. 7—13 I 1844 Oribata horrida, Gervais in: Walckenaer, 

 Ins. Apt., v. 3 i>. 254 j 1840 Xothrus mutilus, C. L. Koch, C, M. A., fasc. 29 1. 18 | 

 1840 X. bistriatus, C.L.Koch. CM. A., fasc. 29 t, 21 j 1840 X. sinuatus, C L. Koch. 



