444 Trans. Acad. Sci. of St. Louis. 
able condition for insect visits at different times. May 5 and 
9,* principally on the former day, I captured the following 
visitors: — 
sda ac der (1) Apis mellifica L. 8, s. and c. p., ab.; (2) 
Bombus americanorum F. 9,s.; (3) Ceratina dupla Say ¥,s.; Andrenidae: 
(4) Andrena bicolor F. @, s.; (5) A. sayi Rob. 9,8.; (6) A. pepinsltsn 
Rob. §'9, 8., freq.; (7) A. flavo-clypeata Sm. ¢'2, 8., ab.; (8) A. 
Rob. i, s.; (9) A. forbesii Rob. 9, s.andc.p.; (10) A. claytoniae hab. oe 
8., freq. ; (11) A. crataegi Rob. 9'Q,8s.,ab.; (12) Halictus arcuatus Rob. 2,8.; 
(13) H. lerouxii Lep. 9, s. and c. p., freq.; (14) H. cressonii Rob. Q.8.; 
(15) H. zephyrus Sm. 9,s. and c. a el (16) H. confusus Sm. 9, s.; 
(17) H. stultus Cr. 9, s. and c. p., ab.; (18) Ra ca pura Say a ee 
(19) Colletes inaequalis Say ae Veapidae: (20) Vespa germanica F 
(21) Polistes metrieus oo 8.; (22) P. pallipes Lep., = Eumenidae: "'ag) 
Odynerus tigris Saus 
Diptera — Onuipttacs C#) Myopa vesiculosa Say, s., ab.; Syrphidae: 
(25) Pipiza pistica Will.; (26) Chrysogaster ustulata Lw.; (7) Myiolepta 
strigillata Lw., freq.; (28) Eristalis dimidiatus Wd.; (29) Helophilus 
similis Mcq.; (30) alas fraudulosa Lw.—all s. and f. p.3; t noNSntiaes 
(31) Hyalomyia sp., s.; Sarcophagidae: (32) ec sp., 8.; Muscidae 
(33) “adseae ervthroce phala Mg., s.; (34) C. vomitoria L.,s.; (35) Luci- 
lia caesar L ; (36) L. cornicina F., s.; (37) Cyrtoneura sp., s.; Antho- 
myidae: (38) Chewetias 
Coleoptera — Scarab jaitaen oo Euphoria fulgida F.; Cerambycidae 
(40) = sds fee cscs ; Chrysomelidae: (41) Diabrotica vittata 
F.; Oedemeri (42) Asclera ss aeteaieitts Say — alls. orf. p 
Depideneara = Nypephatigis: (43) Grapta interrogationis F., s. 
Cratargus cocciwea L.—The flowers of this form agree in 
most essentials with those of the variety, but are more fragrant, 
smaller, grow in smaller cymes, and the nectar-bearing disc is 
more concave and narrow. 
When the flowers open, the receptive stigmas are exposed 
above the anthers, which are still closed. The stamens are 
bent inwards over the disc. They turn outwards in succession, 
the outer ones discharging pollen first. 
The flowers bloom from May 5 to 22. On the 9th and 12th, 
the following visitors were noted :— 
enn in. (1) Apis mellifica L. 8, s. andc. p., freq.; (2) 
Bombus americanorum F. Q, s., freq.; (8) B. virginicus Oliv. 9, s-3-(4) 
Ceratina dupla as oe 8. ¢- (8) ainiaie articulata Sm. <j, 8.; ‘Andrenidae: 
(6) Andrena sayi Rob. 9, 8.; (7) A. perezi Rob. 6j', 8.; (8) A. cressonii Rob. 
* I did not find the flowers under favorable conditions for insect visits 
this date. 
