Amerus, Damaeus 



53 



1. Gen. Amerus Berl. 



1883 Amerus?, Berlese, A. M. S.. fasc, 3 nr. 5 1896 A., Berlese, A. M. S.. 

 fasc. 79 nr. 7. 



Cephth. and Abd. coalescing in the median line without any demar- 

 cation between them. 



1 species. 



1. A. troisi (Bed.) 1883 Belba Troisii, Berlese, A. M. S., fasc. 3 nr. 5 j 1896 

 Amerus T., Berlese, A. M. S., Crypt. II p. 40. 



Im. Very dark brown; polished. 2 pairs of Rost. hairs long and 

 flexible ; Psstg. near together ; Psstg. org. very long, setiform. Abd. long, 

 rounded posteriorly, with 2 sparse longitudinal rows of very long flexible 

 hairs on dors, surface. Chitinous projections at side of body between legs 

 1 and 2, 2 and 3. 3 and 4. L. 1,1 mm. 



Algeria, Italy. 



2. Gen. Damaeus C. L. Koch 



?1796 Acarus (non Acarus, Typ. : A. coleoptratus L.. Latreille 1795!), Latreille, 

 Precis Caract. Ins.. p. 184 (Typ. : A. geniculates L.) 1835 Damaeus, C.L.Koch, C. M. A., 

 fasc. 3 1842 D., C. L. Koch, libers. Arack., v. 3 p. 106 | 1855 D., Nicolet in: Arch. 

 Mus. Paris. 0.7 p. 459 j 1888 D., Michael, Brit. Orib., v.2 p. 404 | 1891 D., Canestrini 

 in: Atti 1st. Yeneto. ser. 7 v. 2 p. 580 1892 D., Trouessart in: Rev. Sci. nat. Ouest, 

 V.2 p. 48* | 1877 Belba (non Heyden 1826!). Canestrini & Fanzago in: Atti 1st. Veneto, 

 ser. 5 r.4 p. 77 | 1895 B., Banks in: Tr. Amer. ent. Soc, v. 22 p. 12 | 1896 B., Oudemans 

 in: Tijdschr. Ent., v. 39 p. 55 j 1885 Belba -j- Damaeus, Canestrini, Prosp. Acarof., v. 1 

 p. 8. 9 1896 B. -f D. + Dameosoma (part.), Berlese, A. M. S., Crj-pt, II p. 38, 39, 54. 



Cephth. and Abd. clearly separated. 



21 good and 4 doubtful species. 



Key to the good species. 



j | Ung. mond. (Div. I. - - Gen. Belba Berl.) — 2. 

 I Ung. trid. (Div. H. - - Gen. Damaeus Berl.) - f7. 



J Abd. oval in outline — 3. 

 \ Abd. round in outline — 4. 



(Abd. rounded posteriorly. Dors, of Abd. covered 

 with fine short hairs distant from each other 

 about their own length. L. 1 mm .... 8. D. nigro-fernoratus . p. 57 



(Abd. pointed posteriorly, hairs on Dors, of Abd. 

 long and few. — L. 510 |a 9. D. nitens p. 57 



/ Psstg. org. long and flageUiform (i. e. setiform 



4 i and flexible) — 5. 



< Psstg. org. not flageUiform — 9. 



Joints of legs mostly moniliform; i. e. with 

 very short peduncle and almost globular 

 head; Im. usuallv carrying cast skins of Dors. 



5 | of Abd. — 6. 



I Joints of legs not moniliform, Im. not carrying 

 cast skins — 7. 



