274 memoirs of the carnegie museum. 



Sources of the Material Examined. 



In 1890 Mrs. Eigenmann and myself published a revision of the Pygidiidce as 

 part of the general monograph on the Nematognathi of South America (Occasional 

 Papers California Academy of Sciences, Vol. I, 1890, pp. 316-347). Our account 

 was based on the material in the Museum of Comparative Zoology, which was col- 

 lected during the Nathaniel Thayer Expedition to Brazil, 1865-1866, during the 

 U. S. Naval Astronomical Expedition to the Southern Hemisphere, across the Andes 

 from Lima, 1849-1852, during the Hassler Expedition at Santiago, Chile, and Callao, 

 Peru, and during Alexander Agassiz's Expedition of 1875 to Lake Titicaca. I have 

 freely drawn on this monograph, which describes some species, which have not been 

 duplicated. 



From time to time Mr. J. D. Anisits and Sr. A de W. Bertoni have sent col- 

 lections to Indiana University from Paraguay, containing, among other things, 

 the types of Homodicetus and Branchioica. Similarly collections were sent from 

 Sao Paulo by Messrs. Hermann and Rudolph von Ihering. 



The collections made by the late J. B. Hatcher for Princeton University were 

 received and reported upon by me in Vol. Ill of the Reports of the Princeton Uni- 

 versity Expedition to Patagonia. 



Miss Lola Vance made a small but valuable collection, containing specimens 

 of Pygidium oroyce, near Tarma, Peru. 



The Yale-National Geographic Society Expedition to Peru collected a few 

 specimens in the Urubamba Valley, which are being reported upon in the Bulletin 

 of the Museum of Comparative Zoology. 



I collected several species in British Guiana, which were described in the 

 Memoirs of the Carnegie Museum, V, 1912. 



Mr. Thomas Barbour collected Pygidium barbouri in the Beni River in Bolivia. 



Several specimens, some of them new, were purchased for the collection of 

 Indiana University from W. F. H. Rosenberg, London. 



By far the greater and most valuable collections were secured in Ecuador and 

 Colombia, and in Brazil, Uruguay, Paraguay and the Argentine. 



The collections from Colombia were made by several field-parties. I collected 

 between Bogota and Buenaventura and at Istmina. Mr. Arthur W. Henn col- 

 lected between Buenaventura and Istmina. Mr. Henn also collected in the upper 

 valley of the Patia and southward in the Andes of Ecuador. Mr. Manuel Gon- 

 zales collected in Colombia along the routes from Bogota west to Honda, north 

 to Mogotes, and east to Barrigona, securing a wealth of material. Messrs. A. S. 

 Pearse, M. A. Carriker, Jr., and Alexander Grant Ruthven collected in the Sierra 



