Robertson — Flowers and Insects — Labiate. 103 
I have found the flowers in bloom from July 25 to Sept. 16. 
On seven days, Aug. 13-Sept. 16, I observed the following 
insects visiting the flowers for honey :— 
Diptera — Bombylide: (1) arene acaee Say; Empide: (2) 
Empis clausa Rob. aca Syrphide: (3) Tropidia quadrata Say; (4) Syritta 
pipiens L.; Dexide: (5) Rhynchodexia pi ; (6) Scotiptera parvicornis 
Twns. (Ms); ; Tachinides (7) Jurinia smaragdina Mcq.,ab.; (8) J. apicifera 
Wik.; Muscide: (9) Lucilia sylvarum Mg.; (10) L. cornicina F. 
Hymenopte hin Asairmenleies (11) Augochlora pura Say ¢; Philanthide: 
(12) Eucerceris zonatus Say; Sphecide: (13) A fnnvephine vulgaris Cr.; (14) 
A. gracilis Lep.; (15) Isodontia philadelphica Lep.; Pompitides (16) 
Pompilus marginatus Say; Scoliide: (17) Myzine 6-cincta F.; (18) M. inter- 
rupta Say 
ee ee (19) Pieris rape L.; (20) Ancyloxypha numi- 
” oreapiees — Lampyride: (21) Chauliognathus pennsylvanicus DeG. 
At first I expected to find a preponderance of hymenoptera, 
but I found diptera more abundant. The most frequent visitor 
was Jurinia smaragdina. In showing a preponderance of 
species of diptera, my list agrees with the lists of European 
species observed by Miiller and MacLeod, as shown in the fol- 
lowing table: — 
ere leae 
a legis sis 2 
& |8eigs fs 
Ee ise 
Alf |n [5 
Mentha arvensis —Low ee ee be ee ey os ee oe a peas ee 
aquatica — 18} 5 23 
sylvestris — Alps — Miller «+..4.0222) SoS Bsc eg 
nees — MacLeod.....| 8 | 4] 8] 2|...-| 19 
ancseusin ss Tiltnoter case ee ee 10 8 2 1 bees 21 
Lycopus sinuatus El\l.— This species is common in wet 
places. The stems sometimes grow as tall as one metre, and 
are considerably branched. The flowers are arranged in 
axillary whorls. 7 
The plant is gynodiccious.* The corolla is white and 
* According to Schulz, L. europswus bears female flowers — Beitrige zur 
Kentniss der Bestéubungseinrichtungen u. d. Geschlechtsvertheilung b. d. 
Pflanzen. 
