Willis and B nr kill. — Floivers and 
260 
4. Observations at Cambridge, 1892-4. 
I. H. B. AND J. C. W. 
Only four flowers were carefully watched, and their visitors 
are noted below. 
LABIATAE : 40 . Origanum vulgare L. [Class B, Lit. 1 , 2, 
3, 4, 17, 18, 21, 26, &c.] A great mass of this plant was 
growing in the Botanic Garden (for the experiments described 
in 26) and the insects visiting it were noted, during the years 
1892 - 3-4 (middle of July to about Aug. 20 ). 
Visitors. Lepidoptera. Rhopalocera : (1) Pieris brassicae L., 
s. h. freq. (2) P. napi L., do. (3) P. rapae L., do. (4) Vanessa 
urticae L., do. (5) Polyommatus phloeas L., do. Heterocera : 
Pyralidae : (6) Pyrausta ostrinalis Hb., s. h. Hymenoptera. Aculeata : 
Acutilingues : (7) Apis mellifica L., s. h. ab. (8) Bombus hortorum 
L., do. (9) B. pratorum L., do. (10) B. terrestris L., do. (11) 
Psithyrus vestalis Fourc., s. h. (12) P. quadricolor Lep., s. h. (13) 
Andrena sp. ?, s. h. (14) Halictus minutissimus Kirby, s. h. 
Eumenidae'. (15) Odynerus sp.?, s. h. Diptera. Syrphidae : (16) 
Syrphus balteatus Deg. (17) S. ribesii L. (18) S. vitripennis Mg. 
(19) Eristalis tenax L. (20) E. pertinax Scop. (21) E. horticola 
Deg. (22) Myiatropa florea L. Tachinidae : (23) Siphona geniculata 
Deg. Anthomyiidae : (24) Anthomyia sp.? (25) Homalomyia cani- 
cularis L. Cordyluridae : (26) Scatophaga stercoraria L. Coleoptera : 
(27) Meligethes aeneus F., f. p. Hemiptera : (28) Calocoris 
bipunctatus F. (29) Anthocoris sp.? (30) A. sp ] 
41 . Ballota nigra L. [Class H, Lit. 1, 3, 4, 11, 17, 18, 
21, &c.] Abounds in the district. The observations were 
mostly made at Grantchester, in Aug. 1893 . 
Visitors. Lepidoptera. Rhopalocera : (1) Pieris rapae L., s. h. 
Heterocera: Noduidae : (2) Plusia gamma L., s. h. Shelford, Oct. 7, 
1894. Hymenoptera. Aculeata: Acutilingues'. (3) Bombus cog- 
natus Steph., s. h. (4) B. muscorum L., s. h. (5) B. latreillellus 
Kirb., s. h. (6) Halictus sp. ?, s. h. Diptera. Syrphidae'. (7) 
