PART IIT. | THE MECHANISMS OF FLOWERS. 475 
ab.; (4) Andrena nigrozwnea, K. ?, s.; (5) Megachile cireumcincta, K. ¢, s. ; 
(6) Nomada germanica, Pz. 2, s.; (7) Celioxys sp. g, s.; (b) Sphegida : 
(8) Ammophila sabulosa, L. 9 ¢, s., ab. ; (9) Cerceris variabilis, Schr. 2 g, - 
s. ; (10) Lindenius albilabris, F., s. B. Diptera—(a) Bombylide : (11) Sys- 
teechus sulfureus, Mik., s.; (b) Syrphidw: (12) Eristalis arbustorum, L., very 
ab., s. ; (13) E. sepulcralis, L., s. ; (14) Syritta pipiens, L., s., ab. ; (15) Volu- 
cella bombylans, L., s. ; (¢) Conopide : (16) Conops flavipes, L., s. ; (17) Sicus 
ferrugineus, L., s.; (18) Myopa testacea, L., s.; (d) Muscide: (19) Lucilia 
cornicina, F. ; (20) Echinomyia tesselata, F. ; (21) Gymnosoma rotundata, L. ; 
(22) Ocyptera brassicaria, F., ab. ; (23) Sarcophaga carnaria, L., very ab. ; (24) 
S. albiceps, Mgn., very ab., all only sucking. C. Lepidoptera—(a) Rhopalo- 
cera: (25) Satyrus pamphilus, L. ; (26) 8. Janira, L. ; (27) Argynnis Aglaia, 
L. ; (28) Lyceena icarus, Rott. ; (b) Sphinges: (29) Sesia empiformis, Esp 
(Almethal) ; (30)_S. tipuliformis, L.,—all sucking. See also No. 590, 111., and 
No. 609. 
I have observed altogether on 7’ ishli — 
| 
Apidx. aeons Diptera. fot ches Total. 
= foal 
In the Alps... 
| 
In the Lowlands: 7 17 20 on 30 
ie 
25 65 30 | 2 | 122 
In every 100 insect-visitors there are, therefore :— 
Apide. Lepidoptera.| Diptera, {Other Insects.) Total. 
In the Lowlands 
23°6 27°7 41°6 6°9 99°9 
| 
: 
In the Alps... .. | 20°5 53°2 24°6 1°6 99°9 
341. THYMUS VULGARIS, L.—I have observed the following 
visitors in my garden :— 
A. Hymenoptera—(a) Apide: (1) Apis mellifica, L. $,s. ; (2) Halictus, 
small species, s. and ¢.p. ; (b) Sphegide: (3) Ammophila sabulosa, L. 9 ¢, s. 
B. Diptera—(a) Empide: (4) Empis livida, L.,s:; (b) Syrphide : (5) Syritta 
pipiens, L., s. and f.p., ab.; (c) Muscide : (6) Sarcophaga albiceps, Mgn., s., 
ab. C. Lapidoplora-—Rohinges ; (7) Sesia tipuliformis, L., s. 
342, ORIGANUM VULGARE, L.—This plant agrees with Thymus 
in consisting of large-flowered proterandrous hermaphrodite, and 
small-flowered female individuals, and in the whole mechanism of 
the flowers; and if it is inferior to Thymus in perfume and in the 
