ROSACE A E 385 



10. P. clypearis Schenck J, freq., po-dvg. ; 11. P. communis Nyl. J, do.; 12. P. 



signata Pz. 5 and J, po-dvg. (6) Sphegidae: 13. Oxybelus bellus Dahlb., po-dvg.; 



14. O. uniglumis L. (c) Vespidae: 15. Odynerus sinuatus F. 



Herm. Miiller saw a Cerambycid in the Alps (' Alpenblumen,' p. 228). 

 Sickmann noticed the following Hymenoptera at Osnabruck. 

 Hymenoptera. Sphegidae: 1. Crabro cetratus Shuck.; 2. C. chrysostoma 



Lep.. freq. ; 3. C. dives H.-Sch., rare ; 4. C. leucostoma L., infreq. ; 5. Psen atratus 



Pz., freq. 



Von Dalla Torre observed the following bees in the Tyrol. 



1. Andrena albicrus K. $ and J; 2. Osmia leucomelaena K. J and $; 3. 



Prosopis borealis Nyl. $> and $; 4. P. nigrita F.; 5. P. bipunctata Fir. (also 



recorded by Schletterer). 



260. Kerria DC. 



Homogamous pollen flowers. 



922. K. japonica DC. The flowers of this species are odourless and nectarless. 

 Their mechanism is described as follows by Kirchner ('Beitrage,' p. 40). The 

 anthers of the most external stamens ripen, and the stigmas mature in the bud. 

 The inner stamens are short in proportion to their nearness to the centre of 

 he flower. At first they are curved inwards, but later on become erect. The 

 "narkedly diverging styles attain a length almost equal to that of the longest 

 stamens. Self-pollination is therefore inevitable, and apparently takes place even 

 5efore the flower opens. Focke states that the plant is self-sterile in Europe, but 

 Droduces succulent fruits in Central China, its native region (Abh. natw. Ver., 

 Bremen, xiv, 1897). The petals are at first of an orange-yellow colour, but become 

 nconspicuous before the innermost anthers are ripe. 



Visitors. Kirchner did not see any. 



261. Mespilus L. 



White, conspicuous, homogamous hermaphrodite flowers; with half-concealed 

 lectar secreted by a yellow fleshy ring in the receptacle, internal to the stamens. 



923. M. germanica L. Kirchner ('Flora v. Stuttgart,' p. 427) states that 

 vhen the white flowers of this species open the five styles lie close together, but their 

 itigmas are already mature, and directed outwards. The stamens are inclined inwards, 

 md the innermost anthers are situated beneath the stigmas, while the others are 

 it the same or a higher level, and as they dehisce introrsely automatic self-pollination 

 nust regularly take place. Crossing is only possible at later stages, when the 

 tamens incline more outwards and the styles curve away from one another above. 



262. Crataegus L. 



White, protogynous flowers smelling like herring-brine (of trimethylamide). The 

 lectar is half-concealed and secreted by a ring in the receptacle. On account of 

 heir odour the blossoms are referred to the class of nauseous flowers, visited by 

 lies that are fond of putrefying substances. 



924. C. Oxyacantha L. (Herm. Muller, 'Fertilisation,' pp. 240-1, ' Weit. 

 3eob.,' II, p. 239; Kirchner, 'Flora v. Stuttgart,' p. 426; Loew, 'Blutenbiol. 



DAVIS. II q q 



