Explanation of the plates. 



Plate I. 



Figure 1. C.ltthonius terribilis n. sp. 

 Fig. 1 a. Ç. Anterior portion of body; x 38. 

 Fig. 1 b. c?. Fourth pair of the co.\ae and foremost part of the abdomen; x 50. g genital opening in tlie 



middle of a plate-shaped area with v longitudinal valves along hindmost part of the opening; 



s* and s^ sclerites of the fourth and fifth sternites. 

 Fig. I e. 9- Immovable finger of the left antenna in ventral view; x 215. m marginal teetli ; f tlagellum: 



a serrula interior; I fissure. 

 Fig. 1 d. Q. Movable finger of left antenna; x 217. m marginal teeth; c serrula e.xterior. 

 Fig. 1 c. Q. Maxillae and labrum in dorsal view; x 70. p posterior plate-shaped prolongation of the 



labrum; Is lamina superior maxillaris; li lamina inferior. 

 F'ig. I f 9- Terminal portion of the labrum and left maxilla in dorsal view; x 350. h hairlike projec- 

 tions on I terminal part of labrum ; Is and li as in fig. 1 e. 



9. Maxillae in ventral view; x 75. ma manducatory part; Is and li as in fig. 1 e. 



Ç. Hairs of inner side of left coxa IV; x 320. i and e cf. text (p. (iS). 



9. Left leg I; X 49. /■' and /'-' basal and tibial parts of femur; ta undivided tarsus. 



9- Left leg IV; x 49. f trocliantin; p tibial femoral part; la' first tarsal joint. 



Figure 2. Chthonius Rai/i L. K. 

 Fig. 2 a. 9- Terminal part of left maxilla; x 125. h lamina superior; /(' lamina inferior. 



Figure 3. Obisium muscorum Leach. 

 Fig. 3a. Maxilla and labrum in dorsal view; x 70. Z labrum; Is lamina superior; li lamina inferior; 



p plate-shaped posterior prolongation of labrum. 

 Fig. 3 b. Labrum; x 47, copied from Hansen's Zoologia Danica (7), tab. VII, fig. 6 b. p "clypeus" or posterior 



prolongation of labrum ; c, b, d and e cf. p. 26. 



Figure 4. Ideoronciis Siamcnsis n. sp. 



Fig. 4a. Immovable finger of left antenna in ventral view; x 176. ;)i marginal teeth; f flagellum; a ser- 

 rula interior; / terminal spine; I fissures. 



Fig. 4b. Movable finger of left antenna; x 183. 771 marginal teeth; c serrula exterior; g galea. 



Fig. 4 c. d- Maxillae and labrum in dorsal view; x 90. / labrum; p its posterior prolongation; Is lamina 

 superior; li lamina inferior; /■' fissures. 



Fig. 4 d. cf. Maxillae in ventral view; x 75. /, Is and li as in fig. 4 c; ma manducatory part; /■' median 

 lyriform organ; /- interior marginal fissure; /■' exterior marginal organ; co coxa of the first 

 pair of legs. 



Fig. 4 e. c?. Median lyriform organ (/"') and interior marginal fissure (/■-') of left side; x 375. 



Fig. 4 f. d- Median lyriform organ of right side; x 375. 



F'ig. 4 g. 9- Left palp; x 24. t tactile hairs of hand. 



Fig. 4h. d". Left leg 1. /■' basal femoral part; p tibial femoral part; tu' first tarsal joint. 



Fig. 4 i. d- Left leg IV. /•' trochantin ; /'- and ta' as in fig. 4 li. 



Figure 5. Ideoronciis laminatiis n. sp. 

 Fig. 5 a. Immovable finger of left antenna; x I8U. m marginal teeth; a serrula interior with / terminal 

 spine; b lamina exterior; /"flagellum; / fissure. 



I). K I). Viilensk. Selsk. Skr , 7. ll.fkke, ii;ilurviilensk. ou m:ilhcni. .Mil. III. 1. 27 



