ROSACE A E 



369 



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

 u. Insekt. a. d. nordfr. Ins.,' p. 154.) — 



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

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

 (Budd.) in Nassau, observed the following. — 



A. Coleoptera. (a) Buprestidae : i. Anthaxia quadripunctata L. (H. M.); 

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

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

 skg. (H. M.); 6. Ulidia erythrophthalma it/^., in large numbers, skg. (H. M.V 

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

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

 (Budd.); 10. H. maculatus Sm. 5, do. (H. M.) ; 11. H. morio F. 5, do. (Budd.); 

 12. H. villosulus K. 5, skg. and po-cltg. (Budd.); 13. Nomada fabriciana L. }, skg. 

 (Budd.); 14. Prosopis communis iVy/. J, do. (H. M.) ; 15. Stalls breviuscula A3'/. $, 

 do. (H. M.). (b) Evaniidae: 16. Foenus affeclator /^., nect-lkg. (H. M.). 



Fig. 115. Poleniilla ininiuia^ llallcr f. (after Hcrjii. MUllerJ. A. Flower, seen Irom above (x l) 

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

 anther (X 35). a, epicaly.x ; b, caljTC : c, corolla ; d, stamen ; g, yellow nectar-secreting fleshy ring, into 

 which the stamens are inserted ; _f, inner orang^e-cotoured part of this ring, on which a layer of nectar is 

 found ; .^, ring of hairs hy which nectar is secreted ; /;, orange coloured blotch at base of petal (nectar- 

 guide); /. carpel. 



867. P. prccumbens Sibtli. — 



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

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

 uniglumis Z., skg.), in Norderney. 



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

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

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

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

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



DAVIS, n B b 



