(db. a. C. OtTDEMANS) NOTES ON ACARI. 181 



from Michael {loc. cit.) one of these feathered hairs of the nympha 

 of Cepheus latus *Koch, for comparison with our fig. 13. 



The dorsal surface of the second nymphal skin shows a reticul- 

 ated appearance. This drawing is not seen on the margines of the 

 dorsal surface of the last nymphal skin. In fig. 10 a part of this 

 skin is delineated under higher powers. 



Fig. 11 shows us one of the somewhat spatulate pseudostig- 

 matic organs, and fig, 12 one of the cow- horn-curved hairs of 

 the flat appendages on the foremost edge of the metasoma This 

 hair is not smooth but has here and there some little spines. 



Fig. 15 is a rough sketch of the under side of this nympha, 

 with the position of the genital and anal openings and plates , and 

 four (five?) genital «suckers». 



The length of the animal without the leaf-like hairs is 0.674, 

 the greatest breadth 0.478 millimeters. 



As I found in the same locality the adult CepJiens minutus Koch 

 and another Cepheus sp.., the nympha may be that of one of 

 these two species , but I am not certain of it. 



Belba geniculata Linné, 



Synonyms: 1746. Acarus niger; geniculis femorum globosis, De 

 Geer. Linn. Faun. Suec. Ed. 1, n°. 1210. 



1758. Acarus geniculatus Linn. Syst. Nat. Ed. 10, n°. 17. 



1762. Acarus petrarum niger., ahdomine globoso lucido., fertto- 

 ribus subclavatis Geoffr. Hist. abr. Ins. II, p. 626, n^. 11. 



1776. Acarus femoribus omnibus clavatis Schrank. Beytr. Naturg. 

 p 126, n°. 26, t. 6, f. 9—10, 



1804. ISotaspis clavipes Hebm. Apt. p. 88, t. 4, f. 7, D, E, 

 t. 9, f. U, V. 



1804. Notaspis geniculatus Herm. Apt. p. 92. 



1806. Oribata geniculata Latr. Gen. Crust. Ins. p. 149, n^. 1. 



1817. Oribata clavipes Latr. in Guv. Regn. An. Ill, p. 119. 



1836. Oppia glaucina Koch. Deu. Gr. Myr. Ar. 3, 9. 



1839. Damaeus nodipes Koch. Deu. Gr. Myr. Ar. 30, 6. 



1877. Damaeus geniculatus Murr. Econ. Ent. Apt. p. 213. 



