492 THE FERTILISATION OF FLOWERS. [PART LIT. 
The guiding-marks or pathfinders consist of a yellow spot inter- 
woven with a net of red lines at the base of the middle lobe of 
the under lip. The entry of the bee’s head is aided by two convex 
pouches at the base of the lateral lobes of the under lip, which rise 
up on either side of the base of the middle lobe, and cause the 
shape of the entrance to conform to the inferior curvature of the 
bee’s head. The anthers dehisce shortly before the corolla expands, 
and have their pollen-covered surfaces turned downwards like all 
the other Labiatz described here. The two divisions of the style 
lie at first above and behind the anthers; the upper and shorter 
one, which continues the direction of the style, bears very feebly 
developed stigmatic papille, while those upon the longer division, 
which is bent downwards, are very conspicuous. A bee sucking 
honey in a young flower touches with its dorsal surface, first the 
anthers, and immediately afterwards (pushing up the anthers) the 
papillar tip of the lower stigma. Usually the small part of the 
bee’s back which comes in contact with the stigma lies just between 
the spots that have been dusted with pollen in the same flower, 
and thus cross-fertilisation is carried on. 
Gradually the end of the style curves downwards, and its 
lower division projects between the upper anthers, so that, if the 
pollen has not already been carried away, self-fertilisation ulti- 
mately occurs. 
Visitors : A. Hymenoptera—Apide : (1) Bombusagrorum, F. 2 (12—15) ; 
(2) B. silvarum, L. Q (12—14) ; (8) B. Scrimshiranus, K. ¢ (10), all three 
sucking normally; (4) B. terrestris, L. 2, reaching the honey through holes 
bitten in the lower part of the tube; (5) Andrena Coitana, K. 2 (Tekl. B.). 
B. Diptera—Syrphide : (6) Melanostoma mellina, L., fp. See also No. 590, 
111, and No, 609. 
357. GALEOPSIS OCHROLEUCA, Lam. (Fig. 166).—The nectary 
has the same position as in G. Tetrahit, but it embraces the lower 
part of the two posterior divisions also of the ovary, and (while 
the flower is in full bloom) it distinctly overtops the two anterior. 
The tube is 18 to 20 mm. long, and wide enough in its upper 6 or 
7 mm, to admit any humble-bee’s head, so that a proboscis 11 to 
14 mm. long suffices to reach the honey. The corolla is yellowish- 
white, with yellow guiding-marks at the base of the under lip, and 
in other respects it agrees with that of G. Tetrahit. 
In the relative positions of the essential organs, this species 
differs from G. Tetrahit, for the stigmas extend forwards beyond 
the longer stamens. The lower stigma is in consequence of this 
touched before the anthers by the bee, and in course of time its 
