12 ANGIOSPERMAEDICOTYLEDONES 



12. Halictus cvlindricus F. 5, po-clg. (H. M.); 13. Osmia bicolor Schr. $, po-cltg. 

 (H.M.). D. thysanoptera. 14. Thrips (H. M.). 



Alfken and Hoppner (H.) observed in Bremen: Apidae: 1. Andrena albicans 

 Mull. 5 ; 2. A. parvula K. (H.) ; 3. Apis mellifica L. Jjj; 4. Bombus hortorum L. % ; 

 5. B. pratorum L. $. All po-cltg. 



MacLeod noticed in Flanders: Apis, a sp. of Halictus, 4 Muscids, an Empid, 

 a Lepidopterid, and 2 beetles. 



In Dumfriesshire (Scott-Elliot, ' Flora of Dumfriesshire,' p. 2), hover-flies, an 

 Empid, and a Muscid were observed. 



Burkill (' Fertlsn. of spring flowers, &c.') observed on the Yorkshire coast. 

 A. Diptera. (a) Muscidae: 1. Anthomyia sp., po-dvg. ; 2. Scatophaga stercoraria, 

 po-dvg. (b) Syrphidae : 3. Melanostoma quadrimaculata Verall, po-dvg. B. He- 

 miptera. 4. Anthocoris sp. C. Hymenoptera. Apidae : 5. Bombus terrester L. 

 D. Thysanoptera. 6. Thrips sp. 



24. A. ranunculoides L. (Herm. Muller, 'Weit. Beob./ I, pp. 314-15; 

 Beyer, 'D. spont. Bewegungen d. Staubgefasse u. Stempel'; Warnstorf, Verh. bot 

 Ver., Berlin, xxxviii, 1896; Knuth, ' Bloemenbiol. Bijdragen.') The mechanism 

 of the golden-yellow flowers agrees with that of A. nemorosa. In the Treskow 

 pheasantry Warnstorf observed two hermaphrodite forms, one bearing large flowers 

 (30 mm. in diameter), the other small flowers (average diameter 18-20 mm.). 

 On the other hand, in the park at Wustrau, he noted a form with very small, 

 short-stalked flowers. Some of these possessed numerous green flower-leaves: 

 the gynoecium was often quite vestigial, and the stamens reduced to small green 

 sepaloid structures. 



Visitors. Hermann Muller (H. M.) and myself (Kn.) have observed the 

 following. A. Diptera. Bombyliidae: 1. Bombylius discolor Mikan., vainly 

 nect-skg. (H. M., Thuringia). B. Hymenoptera. Apidae : 2. Apis mellifica L. $f 

 (Kn., po-cltg. ; H. M., po-cltg., and skg., Thuringia). 



Loew observed in the Berlin Botanic Garden: Coleoptera. Dermestidae : 

 Anthrenus scrophulariae Z., po-dvg. 



25. A. narcissiflora L. (Herm. Muller, ' Alpenblumen,' p. 128; Schulz, 

 1 Beitrage,' I, p. 3.) The flowers are protandrous : some of the stigmas of those 

 examined by Schulz in the Riesengebirge were dark-brown, and functionless. The 

 plants observed by Muller in the Alps were capable of automatic self-pollination. 



Visitors. Hermann Muller observed in the Alps 6 po-dvg. flies. 



26. A. baldensis L. (Kerner, ' Nat. Hist. PI.,' Eng. Ed. 1, II.) The white 

 periodically opening pollen flowers are partly protogynous and hermaphrodite, partly 

 pseudo-hermaphrodite and staminate. The former appear in two forms, one pos- 

 sessing short stamens, and adapted for cross-pollination, the other with longer 

 stamens and capable of automatic self-pollination. 



27. A. trifolia L. (Kerner, Nat. Hist. PI.,' Eng. Ed. 1, II; Schulz, ' Bei- 

 trage, II, p. 7.) The white periodically opening blossoms are homogamous pollen 

 flowers, in which automatic self-pollination is easy, since anthers and stigmas are 

 closely approximated. 



Visitors. In the South Tyrol Schulz chiefly observed flies, also some bees 

 and beetles. These may effect cross- as well as self-pollination. 



