LABI ATA E 251 



'Beitrage,' II, p. 195; Loew, 'Blutenbiol. Floristik,' p. 398.)— Schulz says that 

 this species also is sometimes gynomonoecious, and sometimes, though less frequently, 

 gynodioecious with strongly protandrous hermaphrodite flowers. The latter are about 



3 mm. long, and the female ones are only a little smaller, with reduced stamens. 

 Sometimes only gynomonoecious stocks are found. Heinsius states that the herma- 

 phrodite flowers in Holland are homogamous, and that purely female stocks also 

 occur there. 



Visitors. — Heinsius gives the following list for Holland. — 



A. Diptera. (a) Conopidae: i. Conops quadrifasciatus Z'f^. S. (^) Muscidae: 

 2. Echinomyia magnicornis Zeti.i; 3. E. tessellata .^. 5 ; 4. Sarcophaga sp. 5. 

 (f) Syrphidae: 5. Eristalis arbustorum L. $ and 5; 6. E. nemorum Z. S; 7. 

 Melithreptus dispar Lw. $. B. Hymenoptera. (a) Apidae : 8. Andrena nigriceps 

 I^. 5; 9. Apis mellifica Z. 5; 10. Halictus flavipes -F. ^; 11. H. zonulus Sm. j; 

 12. Fshhynis vestaMs I^ourcr. i ; 13. Sphecodes gibbus Z. S. {6) Sphegidae: 14. 

 Ammophila sabulosa Z. ; 15. Cerceris variabilis Schr.; 16. Oxybelus trispinosus 

 F.i. C. Lepidoptera. Rhopalocera: 17. Coenonympha pamphilus Z. ; 18. 

 Epinephele hyperanthus Z. ; 19. Lycaena aegon W.V.^; 20. Pieris napi Z. $. 



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



Herm. Muller (Alps), 8 flies, 5 Hymenoptera, and 3 Lepidoptera. Schletterer 

 (Tyrol), 2 bees — Halictus morbillosus Krchb., and Sphecodes gibbus Z. von Dalla 

 Torre (Tyrol), the Vespid Eumenes puniformis F. Loew (Tyrol), the hover-fly 

 volucella inanis Z. (' Beitrage,' p. 50) : (Berlin Botanic Garden), A. Diptera. (a) 

 Muscidae: i. Luciiia caesar Z. (b) Syrphidae: 2. Eristalis nemorum Z. ; 3. 

 Syritta pipiens Z. ; 4. Syrphus balteatus Deg. B. Hymenoptera. Vespidae: 5. 

 Odynerus parietum Z., var. renimacula Lep. ; also in the var. abyssinica the hover-fly 

 Syritta pipiens Z., and in the var. nemorosa L. Willd. the hover-fly Eristalis 

 nemorum Z. MacLeod (Pyrenees), 4 Hymenoptera, 5 Lepidoptera, 2 beetles, 



4 hover-flies, and 4 Muscids (Bot. Jaarb. Dodonaea, Ghent, iii, 1891, pp. 324-5). 



2232. M. Pulegium L. (Schulz, ' Beitrage,' II, p. 195.) — This species also 

 possesses gynomonoeciously and gynodioeciously distributed female flowers, as well 

 as protandrous hermaphrodite ones. 



704. Lycopus Tourn. 

 Gynomonoecious or gynodioecious, or protandrous hermaphrodite flowers with 

 concealed nectar. The female flowers are generally smaller than the herma- 

 phrodite ones. 



2233. L. etiropaeus L. (Herm. Muller, 'Fertilisation,' pp. 471-2; Schulz, 

 ' Beitrage,' II, pp. 125-6; Knuth, 'Bl. u. Insekt. a. d. nordfr., Ins.,' pp. 117, 165, 

 ' Bloemenbiol. Bijdragen'; Kirchner, ' Flora v. Stuttgart,' p. 610.) — The small white 

 flowers of this species generally possess nectar-guides in the form of red spots on the 

 lower lip. The corolla-tube of the hermaphrodite flowers is only 3-4 mm. long, 

 about 2^ mm. wide at the entrance, and scarcely a mm. wide at the base. The 

 secretion of nectar is, as usual, effected by the large, fleshy base of the ovary. The 

 inner surface of the corolla-tube is closely beset with vertical hairs to protect the 

 nectar from rain. The latter is accessible even to very short-tongued insects, as the 

 corolla-tube is short and wide. 



In the first stage of anthesis, the two mature stamens with pollen-covered anthers 

 project from the flower, while both sligmatic branches are still apposed. In the 



