ORCHIDEAE 421 



Nyl. 5. The smaller bees are too weak, and the larger flies too bulky to make their 

 escape, and so remain as prisoners. Andrena parvula K. 5 and several flies (Empis 

 punctata F., Cheilosia sp., Anthomyia sp., and Spilogaster semicinerea Wted.) were 

 often found dead in the labellum. Small beetles (Meligethes) are often able to creep 

 freely out of the labellum, but sometimes they are held fast by the sticky pollen and 

 remain to perish. 



2653. C. barbatum Lindl. (Delpino, 'Ult. oss./ pp. 176, 229, 'Applicaz. d. 

 teor. Darwin.,' pp. 19-20.) Delpino says that this species is apparently pollinated 

 by flies, as he found them in the labellum of hot-house specimens, and also observed 

 the setting of fruits there. 



838. Selenipedium Reichenb. f. 



2654. S. caudatum Reichenb. f. (Delpino, 'Ult. oss.,' p. 177.) Delpino 

 supposes that this species is pollinated by snails. 



839. Angraecum Bary. 



2655. A. sesquipedale Thou. (Darwin, op. cit., p. 162; W. A. Forbes, 

 Nature, London, iii, 1873, p. 121.) Darwin says that this species possesses such 

 a long spur that an insect must have a proboscis about 25 cm. long in order to reach 

 the nectar. W. A. Forbes has discovered such an insect. 



840. Masdevallia Ruiz et Pav. 



2656. M. muscorum Reichb. J. (F. W. Oliver, Ann. Bot., Oxford, i, 1888, 

 pp. 237-53.) F. W. Oliver states that this species possesses a sensitive labellum, 

 which imprisons the small insect visitor in a cavity, from which it emerges covered 

 with pollen. On visiting another flower it dusts the stigma. 



841. Bulbophyllum Thou. 



2657. B. macranthum Lindl. (Ridley, 'Ann. Bot.,' Oxford, iv, 1889-91,. 

 pp. 327-36.) Ridley says that this species is pollinated by a small fly. 



842. Zygopetalum Hook. 



2658. Z. maxillare Lodd. The flower mechanism of this species is described 

 in detail by an anonymous writer in the 111. Monatsschr. fiir d. Gesamtinteressen 

 d. Gartenbaues, ii, and Neubert's D. Garten-Mag., xxxvi, 1883. 



843. Nephelaphyllum Blume. 



2659. N. pulchrum Blume. As No. 2658. 



844. Dendrobium SW. 



2660. D. sanguinolentum Lindl. As No. 2658. An abstract will be found 

 in Justs bot. Jahresber., Leipzig, xi, (1883) 1885, pp. 492-3. 



