508 THE FERTILISATION OF FLOWERS. [PART IIT. 
All the specimens of P. media that I have examined were less 
markedly proterogynous than P. lanceolata, for the stigmas are 
always still fresh after the anthers have shed their pollen; but 
various forms of P. media differ greatly in this respect, as may be 
seen by comparing 3 and 4, Fig. 171. 
The foregoing remarks are simply intended to call the attention 
of botanists to forms of P. media intermediate between the 
anemophilous and entomophilous conditions, and so to lead to more 
thorough investigation ; I do not by any means suppose that they 
exhaust the subject. 
Visitors: A. Hymenoptera—A pide’: (1) Bombus terrestris, L. 2, ¢p., 
ab. ; (2) Eucera longicornis, L. ¢, seeking vainly for honey (attracted by the 
scent?) ; (3) Halictus albipes, F. 9; (4) H. cylindricus, F. 2, both freq. ; 
(5) Andrena, 2 (moderate size), do.; (6) Megachile circumcincta, K. 9. 
B. Diptera—(a) Syrphide : (7) Melanostoma mellina, L., I once saw this fly 
hovering for a long time over many flowers, until it came to P. media, on 
which it settled at once, and began to stroke the anthers with its labelle (f.p.) ; 
(8) Ascia podagrica, F., f.p.; (9) Syrphus balteatus, Deg., f.p.; (10) Eristalis 
arbustorum, L., very ab., f.p. ; (11) Rhingia rostrata, L., fp. ; (6) Muscide : 
(12) Spilogaster semicinerea, Wied., very ab., f.p.; (c) Stratiomyide: (13) 
Chrysomyia formosa, Scop. C. Coleoptera—(a) Nitidulide : (14) Meligethes, 
freq. ; (b) Malacodermata: (15) Anthocomus fasciatus, L.; (16) Malachius 
eneus, L., both freq., gnawing the anthers; (c) Cerambycide : (17) Strangalia 
nigra, L., do. See also No. 590, 111., and No. 609. 
Ludwig has found P. media to be gynodicecious in Germany. 
Some species of Plantago have cleistogamic flowers according 
to Kuhn (399). 
Ludwig has discussed in several papers the occurrence of 
cleistogamy, gynodicecism, and heteranthery (.¢. the existence of 
different forms bearing anthers of different lengths) (425, 429, 
430, 431). 
Orv. NYCTAGINEZ. 
Pisonia hirtella is proterogynous, according to Delpino. The 
stigmas in the first stage, and the anthers in the second, protrude 
some millimetres beyond the tubular corolla (177). 
. Oxybaphus and Nyctaginea have cleistogamic flowers (Asa Gray, 
No. 167). 
Neea theifera, Oer.—The diclinous flowers have been desorihad 
by Warming (762) and Oersted.1 
Mirabilis Jalapa, l., is eagerly visited by Sphina convolvuli 
(590, II.). 
1 Bot. Zeit, xxvii. pp. 217-222, 1869. 
