332 



ANGIOSPERMA EDICOTYLEDONES 



the pollen clinging to them through the tip of the carina on to the ventral surfaces 

 of bees. This pollen dusts the projecting stigma of the next flower visited, so 

 that crossing is effected. Although the stigma is surrounded by the pollen of the 

 same flower, automatic self-pollination apparently does not take place, the stigmatic 

 papillae needing to be rubbed (by visiting bees) before they become receptive. 



Visitors. I saw the following bees in the North Frisian Islands. i. Apis 

 mellifica Z. $j, skg. ; 2. Bombus derhamellus K., do. ; 3. B. terrester Z., do. ; and also 

 B. agrorum F. $>, do. (Riigen). 



Fig. 108. Lathyrus praUnsis, L. (after Herm. Miiller). (i) Flower seen from the side (slightly 

 enlarged). (2) Flower after removal of calyx and vexillum, seen from above (further enlarged). (3) Left 

 ala, seen from within. (4) Flower after removal of vexillum and alae, seen from above. (5) Bud shortly 

 before opening, after removal of calyx, vexillum, and alae ; seen from the side. (6) The anterior part 

 of the same, seen from above. (7) Style with brush and stigma, seen from the side. (8) The same, 

 seen from within, a, alar sac, lying in a deeper pouch (a') of the carina; 6, process of alar margin, 

 directed forward and downward : it interlocks with the narrowest part of the pocket-like carinal sac; 

 c, transverse depression in the ala, immediately behind the anterior dark yellow lobe, an angular 

 ridge-like vexillar fold (o) is closely connected with it ; d, posterior process of the upper alar margin ; 

 e, alar claw; f y margin of the ala folded over; gg, margins of the carina; h, uppermost filament; 

 /', fused filaments; k, nectar passages, with basal nectaries: /, carinal claws; m, place at which the 

 tip of the style and the stigma project, when the carina is depressed ; w, leaf-like expansion along the 

 line of fusion of the carinal petals ; o, ridge-like processes of vexillum ; /, terminal sacculation of 

 the carina. 



Alfken observed the following bees at Bremen. 



1. Bombus arenicola T/is. ; 2. B. derhamellus K. 5 and ; 3- B. distinguendus 

 Mor. 2 and jjl; 4. B. lapidarius Z. 5; 5- B. lucorum Z. $f; 6. B. muscorum F. j; 

 7. B. sylvarum Z. 5 ; 8. Eucera difficilis (Duf.) Per. $ and J ; 9. Megachile circum- 

 cincta K. 5; 10. M. willughbiella K. 5. 



Loew noticed Diphysis serratulae Pz. J, po-cltg., in Steiermark ('Beitrage,' 

 P- 53). 



Herm. Miiller (H. M.) and Buddeberg (Budd.) noticed the following. 



1 Bombus agrorum F. $, in large numbers, skg. (H. M., Thuringia) ; 2. Diphysis 

 serratulae Pz. 5 and S, skg. (H. M., Budd.); 3. Eucera longicornis Z. 9, do. (H.M., 

 Budd.) ; 4. Megachile maritima K. J, do. (H. M.) ; 5. M. versicolor Sm., skg. and 

 po-cltg. (H. M.). 



