Robertson — Flowers and Insects. 159 



fleurs. Bull. Soc. royale bot. Belgique 17: 159. 1878. E. europaeus.— (7) 

 Miiller, Die Stellung der Honigbiene in der Blumenwelt. III. Bienenzeitung 

 Jahrg. 39: 157-61. 1883. E. europaeus, Apis wanting. (Just ll 1 : 476).— 

 (8) Loew, Blumenbesuch von Insekten an Freilandpflanzen. Jahrb. Bot. 

 Gartens Berlin 3: 82 (14) 1884.— (9) Loew, Weit. Beob. iiber den Blumen- 

 besuch von Insekten an Freilandpflanzen. Jahrb. Bot. Gartens Berlin 4: 152. 

 1886.— (10) Kirchner, Flora von Stuttgart und Umgebung, 356. 1888. E. 

 europaeus.— (11) Trelease, Ilicineae and Celastraceae. Trans. St. Louis 

 Acad. Sci. 5: 349-50. 1889.— (12) Schulz, Beitrage zur Kenntniss der Bestiiu- 

 buDgseinrichtungen und Geschlechtsvertheilungbeiden Fflanzen. 2: 61, 185. 

 Bibliotheca Botauica 17, 1890.— (13) Kerner, Pflanzenleben 2: 169. 1891. 

 E. europaeus. (Just 17 1 : 531) — (14) MacLeod, Bevruchting der bloemen 

 van Vlaanderen. Bot. Jaarboek 6: 246, 437. 1894. E. europaeus. (15) Loew, 

 Bliitenbiologische Floristik, 214, 378. 1894. E. europaeus. 



Aesculus L.— Most of the observations made upon this 

 genus were upon plants growing in Europe, where none of 

 them are indigenous. AE. rubicanda is andromonoeeious, 

 with the perfect flowers proterogynous (Hildebrand 2). AE. 

 macrostachya is also andromonoeeious, with the perfect 

 flowers proterandrous, and is adapted to nocturnal Lepidoptera 

 (Kirchner 21). AE . Jlava (lutea Wang, octandra Marsh.) has 

 most of its flowers fertile, is perforated by Bombus terrestrzs, 

 and in the Berlin Garden is visited by hive bees (see Loew 

 13, 26). According to Meehan (22) AE . parvifiora is 

 andromonoeeious. Trelease (MS. notes) saw it visited by 

 bumble bees and by Trochilus colubris (10). I suspect that 

 the Red Buckeye, AE. pavia, is specially adapted to hummiug 

 birds. 



Aesculus hippocastanum L. ("Adv. from Asia via 

 Eu."). — Sprengel's account of this species left little to be 

 added. He was mistaken in regarding the perfect flowers as 

 proterandrous instead of proterogynous (2). The plant is 

 andromonoeeious, but Ogle (4) found some flowers which were 

 pistillate from losing their anthers before dehiscence. The 

 flowers are supposed to be adapted to bumble-bees (1, 5, 11, 

 19). In my yard I have seen them visited by: — 



Bees — (1) Bombus americanorum F. $, ab.; (2) B. pennsylvanicus De. 

 G. $,ab.; (3) B. separatus Cr. 9, ab.; (4) B. virginicus Oliv. $,ab.; (5) 

 B. scutellaris Cr. £ ; (6) Synhalonia f rater Cr. J*?, ab. 



Birds— (7) Trochilus colubris L. 



