470 THE FERTILISATION OF FLOWERS. [PART TIT.) 
freq. ; (5) M. Willughbiella, K. ¢; (6) M. centuncularis, L. ¢ ; (7) Anthidium 
manicatum, L. 9 ¢, ab. ; (8) Crocisa scutellaris, Pz. 9 ¢, ab. ; (9) Ceelioxys 
conoidea, Il. 2, freq. ; (10) C. umbrina, Sm. 2; (11) Cheloatomes nigricorne, 
Nyl. ¢, all only sucking. See also No. 590, 11. 
337. MENTHA ARVENSIS, L.—The base of the ovary, which 
secretes the honey, is several times as large as the ovary itself, 
(n, 4, Fig. 159). The corolla forms a bell, which in the pistillate 
flowers is about 2 mm., in the hermaphrodite about 3 mm. long, 
and in both is fully half as wide! at the mouth as it is long. The 
honey is accessible to very short-lipped insects, and it is completely 
sheltered from rain by hairs which extend from the sides of the 
bell to its centre. The flowers make themselves perceptible at a, 
Fra. 159. 
1—4.— Mentha arvensis. 
‘A —Female flower. 
2.—Hermaphrodite flower, in first Ganado stage. 
83.—Ditto, in second (female) stage. 
4.—Ovary and nectary. 
5.—M. aquatica, Female flower, seen obliquely from the front, to show the rudimentary stamens.” 
Figs. 1 and 5 should be horizontal, 
distance by their scent, and their close whorled arrangement renders 
them conspicuous to the eye, still more in the case of the large- 
flowered hermaphrodite than the smaller female plants. I have 
verified by direct observation in the case of Mentha the opinion 
to which I shall recur in describing Nepeta and Thymus, that 
insects visit the more conspicuous flowers before those that are 
less so; in the case of Nepeta and Thymus I have neglected to 
study this point sufficiently, 
Visitors: A. Diptera—(a) Stratiomyide: (1) Odontomyia viridula, F. ; 
@ A pte (2) Eristalis — L., very ab. ; (3) Syritta pipiens, L., 
; (4) Melithreptus scriptus, L. ; (5) M. teeniatus, Mgn., both not rare, s. ; 
ie Huselda: (6) Onesia floralis,. R. D.; (7) O. pepaloralia, Mgn., both ab. ; 
(8) Luciliasilvarum, Mgn. ; (9) L. cornicina, F. ; (10) Pyrellia cadaverina, L. ; 
