Amerus, Damaeus 



53 



1. Gen. Amerus fieri 



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



i'asc. 79 nr. 7. 



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

 cation between them. 



1 species. 



1. A. troisi (Berl.) 1883 Belba Troisii, Berlese, A. M. S., fasc. 3 nr. 5 | 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 



V1796 Acarus (non Acarus, Typ. : A. coleoptratus L.. Latreille 1795!), Latreille, 

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

 fasc. 3 1842 D., C. L. Koch, Ubers. Arach., v.3 p. 106 1855 D., Mcolet in: Arch. 

 Mus. Paris, v.7 p. 459 j 1888 D., Michael, Brit. Orib., v.2 p. 404 | 1891 D., Canestrini 

 in: Atti 1st. Veneto, ser. 7 v.2 p. 580 ! 1892 D., Trouessart in: Rev. Sci. nat. Quest, 

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

 ser. 5 v. 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 -f- Damaeus, Canestrini, Prosp. Acarof., v. 1 

 p. 8, 9 1896 B. + D. + Dameosoma (part.), Berlese, A. M. S., Crypt. 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. II. Gen. Damaeus Berl.) 7. 



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 



3 ' about their own length. L. 1 mm . . . 



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



long and few. L. 510 |n 9. D. rfltens 



i Psstg. org. long and flagelliform (i. e. setiform 



4 J and flexible) 5. 



' Psstg. org. not flagelliform 9. 



Joints of legs mostly moniliform; i. e. with 

 very short peduncle and almost globular 

 head; Im. usually carrying cast skins of Dors, 

 of Abd. 6. 



Joints of legs not moniliform, Im. not carrying 

 east skins 7. 



8. D. nigro-femoratus 



p. 57 

 p. 57 



