ROSACEAE 



39 



866. P. argentea L. (Herm. Miiller, ' Weit. Beob.,' II, p. 242 ; Knuth, B1. 

 x. Insekt. a. d. nordfr. Ins./ p. 154.) 



Visitors. I only observed Meligethes in the island of Sylt, but bees and flies 

 ire the actual pollinators. Herm. Miiller (H. M.) in Thuringia, and Buddeberg 

 [Budd.) in Nassau, observed the following. 



A. Coleoptera. (a) Buprestidae: 1. Anthaxia quadripunctata Z. (H. M.) ; 



2. Coraebus elatus F. (H. M.). (b) Nitidulidae : 3. Meligethes, nect-lkg. (H. M.). 

 B. Diptera. (a) Muscidae: 4. Anthomyia sp. 5, freq., skg. (H. M.) ; 5. Aricia sp., 

 5kg. (H. M.) ; 6. Ulidia erythrophthalma Mg., in large numbers, skg. (H. M.). 

 [b) Syrphidae : 7. Paragus bicolori^, skg. (Budd.). C. Hymenoptera. (a) Apidae: 



3. Andrena dorsata K. 5, skg. and po-cltg. (Budd.) ; 9. Halictus leucopus K. $>, skg. 

 (Budd.); 10. H. maculatus Sm. $>, do. (H. M.); n. H. morio F. 5, do. (Budd.); 

 12. H. villosulus K. $>, skg. and po-cltg. (Budd.); 13. Nomada fabriciana Z. 5, skg. 

 [Budd.); 14. Prosopis communis Nyl. 5, do. (H. M.); 15. Stelis breviuscula Nyl. 5, 

 do. (H. M.). (b) Evaniidae: 16. Foenus affectator F., nect-lkg. (H. M.). 



Fig. 115. Poientilla minima, Haller f. (after Herm. Miiller). A. Flower, seen from above (x 7) 

 B. Longitudinal section through the same. C. Upper part of a stamen, with laterally dehiscing 

 anther (x 35). a, epicalyx ; b, calyx ; c, corolla : d, stamen ; e, yellow nectar-secreting fleshy ring, into 

 which the stamens are inserted ; f, inner orange-coloured part of this ring, on which a layer of nectar is 

 found ; g, ring of hairs by which nectar is secreted ; A, orange-coloured blotch at base of petal (nectar- 

 guide); /, carpel. 



867. P. procumbens Sibth. 



Visitors. MacLeod noticed 3 hover-flies and a Siricid in Flanders (Bot. Jaarb. 

 ' donaea, Ghent, vi, 1894, pp. 313-14); and Verhoeff saw a Sphegid (Oxybelus 

 Mglumis Z., skg.), in Norderney. 



868. P. minima Hall. f. (Herm. Miiller, ' Alpenblumen,' p. 217.) The small 

 :llow blossoms of this species are homogamous, but at the beginning of anthesis 

 ie petals are not quite fully expanded, so that the middle of the flower is the most 

 )nvenient alighting-place, and visitors which come dusted with pollen from an older 

 awer may effect either cross- or self-pollination. Failing insect-visits, automatic 



DAVIS. II g b 



