200 NATURALISTS' ASSISTANT. 



Hahn, C. W. Monographia aranearum. 8 pts. 4to. 32 plates, 

 Nurenburg, 1820-30. (Gcr.) 



Hahn und Koch. Die Arachniden. 16 vols. 8vo. 560 

 plates. Nurenburg, 1831-48. (Ger.) 



Haldemann, S. S. On some species of Hydrachnidae. 

 (Zoological Contributions No. 1.) 8vo. Phila. 1842. 



Hentz, N. M. Spiders of the United States. (Jour. Bost. 

 Soc. vol. 1-6 and Proc. ii). 



Hentz, N. M. Reprint by Emerton and Burgess. 

 1vol. 8vo. (Occas. Papers Bost. Soc.) 21 plates, 1875. 



Herbst, J. F. W. Natural History of Apterous Insects. 4 

 parts. 4to. 23 plates, Berlin, 1797-1800. (Ger.) 



Hodge, G. On British Pycnogonida. (Annals and Mag. Nat. 

 Hist.) London, 1864. 



Johnston, Geo. An attempt to ascertain the British Pycno- 

 gonida. (Mag. Zool. and Bot. i) London, 1837. 



Keyserling. Papers in Verh. Zool. Bot. Ges. Wien, 1862. 

 (Ger.) 



Koch, C. L. lleview of the Arachnida. 8vo. 49 pis. Nuren- 

 berg, 1837-50. (Ger.) 



Koch, C. L. Arachnida of the Family Drassidaa. 7 parts 

 (all pub.) 8vo. Nurenburg, 1866-8. (Ger.) 



Koch, C. L. Australian Arachnida. (22 parts pub.) 4to. 

 Nurenburg, 1871-8. (Ger.) 



Kramer, P. Systematic Revision of the Mites (Archiv fiir 

 Naturgeschichte xliii) 8vo. 1877. (Ger.) 



Kramer, P. Natural History of Hydrachnidae. (Archiv fiir 

 Naturgesch., 1875. 



Mengc, A. Prussian Spiders. 8vo. 81 pis. Dantzig, 1866-76. 



Nicolet, H. Acarina of the environs of Paris. 4to. 10 

 pis. Paris, 1855. (Fr.) 



Say, T. Description of the Arachnides of the U.S. (Jour. 

 Phila. Acad., 1821) 



