LABIATAE 295 



Visitors. — Herm. Muller (H. M.) and Buddeberg (Budd.) give the following 

 list.— 



A. Diptera. Syrphidae: i. Rhingia rostrata L., skg. (H. M.); 2. Xylota 

 sylvarum Z., vainly searching for nectar (H. M.). B. Hymenoptera. 3. Anthidium 

 manicatum L. % and S, freq., skg. (H. M., Budd.); 4. Anthophora furcata Pz. 5 

 and S, less freq., skg. (H. M., Thuringia) ; 5. A. quadrimaculata Pz. $ and $, freq., 

 skg. (H. M.) ; 6. Bombus agrorum F. 5 and 5, do. (H. M.) ; 7. B. hortonim Z. S, 

 skg. (H. M.) ; 8. B. pratorum Z. 5 and S, skg. (H. M.). 



Alfken observed 10 bees, skg., at Bremen. — 



I. Anthidium manicatum Z. 5 and $; 2. Bombus agrorum /'. 5 ; 3. B. der- 

 hamellus .A'. 5 ; 4. B. lapidarius Z. 5 ; 5. B. sylvarum Z. 5 ; 6. Osmia caerulescens 

 Z. 5; 7. O. rufa L.%; 8. Podalirius borealis Mor. $ and S; 9. B. furcatus Z. 5 

 and $; 10. P. vulpinus Pz. 5 and S. 



The following were recorded by the observers, and for the localities stated. — 



Knuth (Schleswig-Holstein), 2 humble-bees (Bombus agrorum F. and B. hor- 

 torum Z., skg.) and 2 po-dvg. hover-flies (Eristalis tenax Z., and Platycheirus sp.). 

 Wustnei (Alsen), the bee Anthophora quadrimaculata F. Loew, Brunswick (B.), and 

 Steiermark (S.), 2 bees (' Beitrage,' p. 53) — Anthidium manicatum Z. 5 (B.) and 

 Bombus agrorum F. 5, skg. (S.) : (Berlin Botanic Garden), the bee Anthidium mani- 

 catum Z. 5 and S, skg., and in copula. Hoppner (Bremen), 4 bees — i. Apis mellifica 

 Z. ; 2. Andrena convexiuscula K. 5; 3. Bombus arenicola Ths. 5 and $; 4. 

 Podalirius retusus Z. 5. Rossler (Wiesbaden), 2 moths — Penthina fuligana Hb., and 

 Botys stachydalis Zk. Friese (Baden and Thuringia), the bee Podalirius furcatus Pz., 

 one S. Heinsius (Holland), 3 bees, skg. — i. Bombus agrorum F. '<^\ 2. B. hor- 

 tonim Z. $; 3. Apis meUifica Z. 5 (Bot. Jaarb. Dodonaea, Ghent, iv, 1892, 

 pp. 1 1 i-i 3). MacLeod (Flanders), 4 long-tongued bees and a Lepidopterid (op. cit., 

 v, 1893, p. 373) : (Pyrenees), the humble-bee Bombus alticola Krchb. 5 (op. cit., iii, 

 1 89 1, p. 332). Scott-Elliot (Dumfriesshire), 3 humble-bees and a hover-fly ('Flora 

 of Dumfriesshire,' p. 138). 



2329. S. palustris L. (Sprengel, 'Entd. Geh.,' p. 308; Delpino, ' Ult. oss.,' 

 p. 149; Herm. Muller, 'Fertilisation,' p. 487, ' Weit. Beob.,' Ill, p. 49; Knuth, 

 ' Bl. u. Insekt. a. d. nordfr. Ins.,' pp. 118, 166, 'Weit. Beob. ii. Bl. u. Insekt. a. d. 

 nordfr. Ins.,' p. 239, ' Bloemenbiol. Bijdragen'; VerhoefF, 'Bl. u. Insekt. a. d. Ins. 

 Norderney'; MacLeod, Bot. Jaarb. Dodonaea, Ghent, v, 1893, pp. 373-4 ; Schulz, 

 ' Beitrage,' II, p. 221; Kirchner, 'Flora v. Stuttgart,' p. 626.) — In this species the 

 lower lip of the bright-purple corolla is marked with a whitish and dark-red patch. 

 The corolla-tube being only 8-9 mm. long, all our native humble-bees (including 

 B. terrester Z. with proboscis 7-9 mm. long) can suck nectar legitimately. The four 

 stamens are of equal length. The anthers of the outer stamens are situated at first 

 in front of those of the inner ones, and dehisce first. Then they bend outwards and 

 are separated from the dehiscing inner ones. Finally, the tip of the style grows 

 downwards between the latter, the stigmatic branches diverging at the same time. 

 Automatic self-pollination is therefore easily possible should insect-visits fail. Kerner 

 says that this is effected in the same way as in the preceding species. Warnstorf 

 describes the pollen-grains as white in colour, ellipsoidal, closely beset with small 

 tubercles, about 44-7 /x long and and 25-31 \i broad. 



Schulz says that Bombus terrester Z. frequently obtains nectar by perforation, 

 in spite of the fact that its proboscis is long enough to suck legitimately. 



