LEGUMJNOSAE 271 



stamens and stigma to protrude. It follows that pollen-collecting insects will carry 

 the pollen of younger flowers to the stigmas of older ones, and thus effect crossing. 



Visitors. In the Oberpfalz, Herm. Miiller only saw a po-cltg. bee Andrena 

 xanthura K. 5. In Steiermark, E. Loew observed a long-tongued bee Megachile 

 sp., po-cltg. ; and Hoffer the humble-bee Bombus mastrucatus Gerst. . 



651. C. sagittalis Koch. (Herm. Muller, ' Weit. Beob./ II, p. 254.) 

 Visitors. These are po-cltg. bees. Herm. MiilleF saw the following in the 



Vosges. 



1. Andrena convexiuscula K. 5 ; 2. Bombus lapidarius Z. tjf ; 3. B. terrester Z. <j> ; 

 4. Halictus rubicundus Chr. <j> ; 5. Osmia fulviventris Pz. $>. 



Buddeberg observed the following in Nassau. 



1. Bombus variabilis Schmiedekn., var. tristis Seidl.^; 2. Diphysis serratulae 

 Pz. t> ; 3. Megachile circumcincta K. 5. 



Rossler noticed the following Lepidoptera as unbidden guests at Wiesbaden. 



1. Grapholitha asseclana Zf. ; 2. G. fuchsiana Rsslr. ; 3. G. succedana Frol. ; 

 4. Threnodes pollinalis S. V. 



652. C. canadensis Steud., and 653. C. albus Link. The flowers of these 

 species possess an explosive mechanism, in which the anthers are at first slightly 

 depressed with the carina, and then spring out above. Hildebrand considers it 

 an adaptation to self-pollination, because some of the scattered pollen reaches the 

 stigma of the same flower (Bot. Ztg., Leipzig, xxiv, 1866, p. 75). It appears very 

 probable that cross-pollination is favoured by insect-visits. 



654. C. austriacus L. 



Visitors. Loew observed a humble-bee, Bombus agrorum F., po-cltg., in the 

 Berlin Botanic Garden. 



198. Sophora L. 



655. S. flavescens Ait. 



Visitors. Loew observed Bombus terrester Z. J, skg., in the Berlin Botanic 

 Garden. 



199. Thermopsis R. Br. 



656. T. fabacea DC- 

 Visitors. Loew observed Bombus hortorum Z., skg., in the Berlin Botanic 



Garden. 



200. Lupinus Tourn. 



Yellow, blue, or white, nectarless bee flowers, with a pumping arrangement 

 from which strings of pollen are extruded. 



657. L. luteus L. (Herm. Muller, 'Fertilisation,' pp. 187-8; Knuth, 'Bliiten- 

 biol. Beob. a. d. Ins. Riigen,' ' Bloemenbiol. Bijdragen.') The dark yellow flowers 

 of this species are devoid of nectar but very fragrant. Hermann Muller describes 

 the alae as being united together by fusion of their anterior margins, while each 

 of them is interlocked with the carina by a latero-basal fold fitting into a cor- 

 responding depression. The anthers of the five outer stamens are very much larger 



