Insects in Great Britain . 
255 
Visitors . Lepidoptera. Heterocera : Noctuidae : (1) Plusia gamma 
L., s. h. Hymenop tera . Aculeata : Acutilingues : (2) Bom bus lapi- 
darius L., s. h. and c. p. (3) B. muscorum L., s. h. and c. p. very ab. 
(4) B. hortorum L., s. h. Myrmicidae : (5) Myrmica rubra L., s. h. 
Diptera. Syrphidae : (6) Melanostoma scalare F. (7) Platychirus 
manicatus Mg. (8) Syrphus balteatus Deg. (9) S. ribesii L., s. h. 
(10) Sphaerophoria scripta L. (n) Eristalis tenax L., s. h. Tachi- 
nidae : (12) Siphona geniculata Deg., s. h. Muscidae : (13) Lucilia 
cornicina F., s. h. (14) Calliphora erythrocephala Mg., s. h. Antho- 
myiidae : (15) Antbomyia radicum L., f. p. (16) A. brevicornis Ztt, 
s. h. Cordyluridae : (17) Scatophaga stercoraria L., s. h. Cole- 
optera : (18) Crepidodera ferruginea Scop., s. h. (19) Meligethes 
picipes Sturm, s. h. (20) M. viridescens F., s. h. 
LABIATAE : 87 . Mentha aquatiea L. [See No. 12 , Auchen- 
cairn.] Observed Sept. 20 to Oct. 7, 1893. This species is 
largely visited on the Scarborough cliffs. It is gynodioecious, 
the two forms occurring in almost equal numbers and both 
freely visited. [In the list of visitors, the letters in brackets 
denote the form visited ; H — hermaphrodite, F = female.] 
In the dusk, Plusia gamma was observed seeking for flowers 
on a flowerless plant, and so had probably been attracted 
thither by the smell. If this be so, the diminished con- 
spicuousness of the female flowers may not be much of a dis- 
advantage. The style in these flowers lies close under the 
upper lip, scarcely being touched by insects until mature. 
The flowers are protandrous. Thrips and small parasitic 
Hymenoptera are common, lounging in the flowers. The 
larva of Eupithecia centaureata S. V. was observed destroying 
a large number of flowers by devouring the style and 
stamens. 
Visitors, Lepidoptera. Rhopalocera : (1) Vanessa urticae L., s. h. 
(H). Heterocera : Noctuidae'. (2) Plusia gamma L., s. h. (H). 
Crambidae : (3) Chilo furcatellus Ztt., s. h. (H). Pteraphoridae : (4) 
Pterophorus fuscus Retz., s. h. (H, F). Tineidae : (5) Plutella cruci- 
ferarum Zel., s. h. (H, F). Hymenoptera. Aculeata : Acutilingues : 
(6) Bombus hortorum L., s. h. (PI). (7) B. lapidarius L., s. h. (H). 
(8) B. muscorum L., s. h. (H). Terebrantia: Ichneumonidae : (9) one 
