1895.] Flowers and Insects. 107 
genus. I have mentioned (23) the flowers on which species 
of Macropis have been observed. Patton (12) states that 
Dufour found both sexes of JZ. daézata on flowers of Alisma 
plantago, and Schenk one or both on Sryouta, Rubus 
caestus, Cirsium arvense and Picris, but no one has seena 
female Macropis collecting .pollen of any flower except Ly- 
Simachia and Stetronema. 
Stetronema ciliatum agrees in all essential particulars with 
S. lanceolatum (23). It grows taller and has larger flowers. 
In Connecticut Patton (13) saw the flowers visited by Macro- 
pis ciliata Pttn. 2 and by M. patellata Pttn. g. In Illinois I 
have seen them visited by WZ. steironematis Rob. 89, the fe- 
male collecting pollen. The latter bee does not seem to have 
a decided preference for yellow, for all of the other flowers I 
have taken it on are white (23). 
On the literature of Lys¢machia and Steironema see:— 
und 
der Befruchtung der Blumen. 1793. JZ. guadrifolia and vulgaris, 104. 
) Kerner, Die Schutzmittel des Pollens 27. 1873.—(3) Miiller, Be- 
fruchtung der Blumen durch Insekten. 1873. Z. vudgaris and num- 
cl. Nat. 17:—.1874. Visits of Macropis to L. vulgaris and punctata 
observed by Piccioli, Miiller and Delpino in Westfalia, at Firenze and 
. vulgaris, visits of radese $a 21; Miiller’s two 
forms, 126.—(6) Darwin, The variation of animals and plants under 
domestication 2: 154. 1876. 2d edit. L. nummudaria, sterility— 
(7) Darwin, The different forms of flowers on plants of the same spe- 
clés. 1877. L. vulgaris, Miiller’s two forms, 4, 342.—(8) Miiller, Das 
Variiren der Grésse gefarbter Bliithenhiillen und sein Einfluss auf die 
Naturziichtung der Blumen. Kosmos. 2: 11-25, 128-139. 1877. JZ. 
vulgaris, (Abstract in Just’s Bot. Jahresbericht 5': 740.\—(9) Henslow, 
On the self-fertilization of plants. Trans. Linn. S < Ot bs 228, 
taires. Extrait des Ann. des Sci. Nat. Bot. VI. 8: 140. 1879. (Just’s 
Bot. Jahresbericht 7': 120.)—{12) Patton, Observations on the genus 
Macropis. Am. Journ. Sci. and Arts. III. 18: 211-14. 1879. LZ. vud- 
€aris and S. ciliatum. (Just’s Bot. Jahresbericht 7+: 145.)—(13) Patton, 
Description of the species of Macropis. Ent. Monthly Magazine 17: 
