The freshwater fishes of British Guiana, including a study of the ecological grouping of species and the relation of the fauna of the plateau to that of the lowlands . years Mr. T. Sidney Hargreaves collected fresh-water fishes inBritish Guiana. They were deposited in the Georgetown Museum. Few havedefinite locality labels. Mr. Hargreaves published a series of articles in TheArgosy, a local paper, which were reprinted in book form. The booklet is onlyof local interest, and adds but little which is of a sufficiently specific nature to bequoted in a scientific work. CHAPTER III. GENERAL ACCOUNT
The freshwater fishes of British Guiana, including a study of the ecological grouping of species and the relation of the fauna of the plateau to that of the lowlands . years Mr. T. Sidney Hargreaves collected fresh-water fishes inBritish Guiana. They were deposited in the Georgetown Museum. Few havedefinite locality labels. Mr. Hargreaves published a series of articles in TheArgosy, a local paper, which were reprinted in book form. The booklet is onlyof local interest, and adds but little which is of a sufficiently specific nature to bequoted in a scientific work. CHAPTER III. GENERAL ACCOUNT OF THE EXPEDITION. Accompanied by Mr. S. E. Shideler, I sailed from New York on August 23,1908, arriving in Georgetown on September 6th. From August to December is the long dry season in Guiana. In consequencethe upper portions of the rivers are lowest in October and November, and thefishes are then concentrated in the channels of the streams. We had rain duringthe first week of our stay in Guiana, but later were only once interrupted by rainor high water. While on the Guiana plateau at Holmia a rain lasting a day anda night caused the river to rise many Fig. 1. Mouth of the Demerara River at Georgetown, British Guiana. The two main objects of the expedition have been outlined in the desired to secure as many characins as possible and to compare the fauna of theplateau with that of the lowland. The former became an incident in the study ofthe latter question. To get an idea of the lowland fauna a series of collections infresh water was made at sea-level within tidal influence from Lama Stop-Off toMorrawhanna, Wismar, Malali, and Bartica. Above tidal influence collectionswere made at Rockstone, Crab Falls, Konawaruk, and Warraputa, in the Essequiboand along the Potaro from its mouth to the Kaieteur. The fauna of the plateauwas studied in the Potaro from the Kaieteur to the Aruataima Cataract. 30 EIGENMANN: THE FRESHWATER FISHES OF BRITISH GUIANA 31 Our equi
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