284 ANGIOSPERMAE^DICOTYLEDONES 



A. Hymenoptera. (a) Apidae: 1. Andrena cineraria Z. 5, po-cltg. ; 2. A. 

 fulvicrus K. $, do. ; 3. A. gwynana K., var. aestiva Sm. 5, do. ; 4. A. pilipes F. 5, do.; 

 5. Coelioxys conica Z. 5, skg. ; 6. C. elongata Lep. $, do. ; 7. C. sp., do. ; 8. Colletes 

 fodiens K. $, do.; 9. Macropis labiata Pz. 5, do. (?>) Sphegidae: 10. Cerceris 

 arenaria Z. 5 and J, skg. (c) Vespidae: 11. Odynerus parietum L., var. renimacula 

 Z<?/., skg.; 12. Eumenes coarctata Z., do. B. Diptera. {a) Chtronomidae: 13. 

 Ceratopogon fasciatus Mg. <j>. (<5) Conopidae: 14. Physocephala rufipes Z\, skg. 

 (c) Muscidae: 15. Olivieria lateralis /l (<f) Syrphidae: 16. Eristalis intricarius Z., 

 skg. ; 17. Helophilus pendulus Z., do. ; 18. Melithreptus sp. ; 19. Volucella bombylans 

 Z., do. 



Friese, quoting Konow and Sajo respectively, gives Systropha curvicornis Scop., 

 not infrequent, for Mecklenburg, and Osmia grandis Mor. (a J) for Hungary. 



Alfken observed the following bees at Bremen. 



1. Andrena flavipes Pz. $; 2. A. propinqua Schenck 5 ; 3. Bombus lapidarius Z. $f. 



Ducke saw the following bees at Aquileja. 



1. Eucera (Macrocera) ruficornis F. $ ; 2. E. (M.) salicariae Lep. 5. 



Schletterer and von Dalla Torre noticed the bee Halictus rubicundus Chr. J, 

 in the Tyrol. 



Schmiedeknecht mentions Andrena nasuta Gir. as a rare visitor. 



Schulz observed flowers perforated by bees. 



683. M. dentata Pers. 

 Visitors. In this species also Schulz observed flowers perforated by bees. 



684. M. caerulea Desr. ( = Trigonella caerulea Ser.). (Kirchner, 'Beitrage,' 

 p. 41.) The bright blue flowers of this plant, which are arranged in short crowded 

 racemes, possess a mechanism agreeing with those of the other species of Melilotus ; 

 but the stigma is either surrounded by the anthers or projects but little beyond 

 them. The calyx is 3-4 mm., the limb of the vexillum 5 mm., the alae 3 mm. 

 and the carina 2 mm. in length. Each ala possesses a basal process overlapping 

 the staminal tube, so that the alae and carina can only be depressed by the 

 application of considerable force. The stamens and pistil then spring up towar 

 the vexillum, but return again into the carina when the pressure is removed. 



Visitors. Kirchner observed the honey-bee. 



207. Trifolium Tourn. 



Yellow, white, or red bee flowers (very rarely Lepidopterid flowers as well] 

 arranged in heads; nectar-secreting and odorous. There is a simple valvular 

 arrangement as in the last genus. According to Kuhn (Bot. Ztg., Leipzig, xxv, 1867), 

 some species bear cleistogamous flowers; Darwin states that this is the case in 

 T. polymorphum ('Forms of flowers'). 



685. T. repens L. (Herm. Muller, 'Fertilisation/ pp. 181-3, 'Weit. Beob.,' 

 II, p. 246; Darwin, Ann. Mag. Nat. Hist., London, Ser. 3, ii, 1858, p. 460; 

 Lindmann, 'Bidrag till Kanned. om Skand. Fjallvaxt. Blomn. o. Befrukt.'; Verhoeff, 

 ' Bl. u. Insekt. a. d. Ins. Norderney ' ; MacLeod, Bot. Jaarb. Dodonaea, Ghent, vi, 

 1894, pp. 342-9; Loew, 'Blutenbiol. Floristik,' p. 395; Knuth, 'Bl. u. Insekt. a. d. 

 nordfr. Ins.,' pp. 59-60, 153, ' Weit. Beob. ii. Bl. u. Insekt. a. d. nordfr. Ins.,' p. 232, 

 * Bl. u. Insekt. a. d. Halligen,' ' Bl. u. Insekt. a. Helgoland,' ' Bloemenbiol. Bijdragen,' 



