76 Hypochthonius 



6. Gen. Hypochthonius C. L. Koch 



1835 Hypochthonius, 0. L. Koch, C. M. A., fasc. 3 ; 1842 H., C. L. Koch. Ubers. 

 Arach.. v. 3 p. 109 j 1888 Hypodhonins, Michael, Brit. Orib., v.2 p. 530 j 1896 If., 

 Berlese, A. M. S. } Crypt. II p. 24, 25. 



Dors, surface of Abd. divided by transverse sutures as if segmented. 

 Cuticle imperfectly chitinized. 



This genus is said by Nicolet (1855, in: Arch. Mus. Paris, -v.7 p. 389), Canestrini 

 (1885. Prosp. Acarof., v. 1 p. 4) and Banks (1895, in: Tr. Amer. ent. Soc,, r. 22 p. 2) to 

 be composed of immature creatures, but they are really adult. 



5 species. 



Key to the species. 



Abd. of 2 segments 2. 



Abd. of more than 2 segments 3. 



. f Segments almost equal. L. 550 750 |u . ... 4. H. rufulus ... p. 77 

 \ Ant. segment much larger than post. L. 750 |u . 5. H. tectorum . . p. 77 



j Abd. of 3 segments, central the narrowest, others about equal 4. 

 3 < Abd. of 4 segments, the 2 central narrow and equal, 



the ant. and post, wider and equal. L. 330 |u 2. H. lanatus . . p. 76 



, Psstg. org. long, filiform, curved, strongly pectinated. 



j L. 360 |it 3. H. pallidulus . p. 76 



j Psstg. org. with short thin peduncle and fusiform hairy 



head. L. 180 |U 1. H. brevis . . . p. 76 



1. H. brevis Michael 1888 Hypocthonius b., Michael, Brit. Orib., v. 2 p. 539 

 t. 49 f. 14. 



Im. Yellow, dull, rather rough. Cephth. broad Rost. hairs serrated. 

 Psstg. dorsal; Psstg. org. white, directed backward, with short peduncle 

 and fusiform hairy head. Intlam. hair white spines. Abd. slightly 

 arched, truncated anteriorly, rounded posteriorly, divided into 3 segments 

 by transverse cuts, central segment narrowest, other 2 equal. 2 longitudinal 

 rows of thick white hairs on Dors, of Abd. and some round periphery Ung. 

 mond. L. ca. 180 |u. 



On sphagnum etc. England. 



2. H. lanatus Michael 1885 Hypocthonius L, Michael in: J. R. micr. Soc., 

 ser. 2 t?.5 p. 396 t. 7 f.ll j 1888 H.I, Michael. Brit. Orib., v.2 p. 541 t.49 f. 15 22. 



Im. Light yellow-ochre, dull, reticulated, slightly pulverescent. 2 low 

 ridges represent Lam. Rost. hairs, Lam. hair, Intlam. hair and 2 other 

 pairs of hairs on Cephth. all like bunches of white wool. Psstg. 

 org. long, straight, directed backward, with rod-like peduncle and fusiform 

 woolly head. Mdb. with fixed chela having 2 branches, both toothed. 

 Abd. pyriform, Dors, thereof coarsely reticulated; reticulations about 8 ju. Dors, 

 of Abd. divided into 4 segments by transverse cuts. 2 central segments 

 equal, ant. and post, segments about equal. On each segment a row of 

 colorless serrated spines which usually lie flat but can be erected. Ung. 

 mond. L. ca. 330 ju. 



In wood, thatched roofs etc. England. 



3. H. pallidulus C. L. Koch 1835 H. p., C. L. Koch, C. M. A., fasc. 3 f. 20 

 1888 Hypocthonius p., Michael, Brit. Orib., v.2 p. 537 t.49 f. 1 5. 



