464 Trans. Acad. Sci. of St. Louis. 
(11) Agapostemon texanus Cr. 9, 8.; (12) A. viridula F. 9, s. andc. p.; 
(13) Halictus gery Say 2, c. p.; (14) H. pilosus Sm. Q, c. p.; (15) H 
stultus Cr. 
Saji Conceaie (16) Zodion leucostoma Will.; (17) Z. fulvifrons 
Say; Syrphidae: (18) Allograpta obliqua Say; (19) Eristalis latifrons Lw.: 
(20) E, transversus Wd.— all s 
ro gi creme i (21) Danais archippus F.; (22) Colias philo- 
dice Gdt., freq. —bot 
PARTHENIUM INTEGRIFOLIUM L.— The stems grow from 
seven to ten decimetres high, and bear dense flat-topped 
corymbs of heads which measure about eight millimetres 
across. 
Each head contains five fertile flowers with broad and short 
obcordate ligules. Each fertile flower thus has a cup-like 
form. The disc flowers are numerous and sterile. The pis- 
tillate flowers are white. The lobes of the staminate flowers 
and the chaff are terminated by white club-shaped hairs which 
make the heads looks somewhat woolly and very white. 
The flat corymbs form a very conspicuous and convenient 
landing place. The shallow ray-flowers furnish nectar, and 
the disc-flowers afford abundant pollen. Numerous small 
and short-tongued visitors are the result. 
I have found the Parthenium in bloom from June 6 to July 
30. Onthe 21st and 27th of June and the 11th of July I 
noted as visitors: — 
Hymenoptera — Apidae ( te Ceratina dupla Say 9,8. and c. p.; (2) Me- 
en montiva aga Cr. Pye ; (8) ee carinatum Cr. (2, Ss: apn ~ 
Say; Philanthidae: (18) Cerceris robertsonii Fox x; a9) C. compacta Cr.; 
‘pale (20) Ammophila intercepta Lep.; Scoliidae: (21) Myzine sex 
ncta F.; Chrysididae: (22) Hedychrum ‘yiolaceum Brullé v. parvum 
aie Braconidae: (23) Bracon sp.; (24) Agathis vulgaris Cr.; Tenthre- 
dinidae: (25) Hylotoma humeralis By. — all s. 
Diptera — Heipidas (26) ae sp., 8.; Conopidae: (27) Zodion 
fulvifrons Say, s.; Syrphidae: (28) Mesograpta marginata Say; (29) ™M. 
geminata Say, ( 30) staaieehised cylindrica Say; (31) Syritta pipiens L-; 
Tachinidae: (32) sp.; (83) Hyalomyia purpurascens Twns. ; (34) Cistogaster 
occidua WI1k.; (35) Ocyptera euchenor WIk.; (36) Miltogramma cinerascens 
Twns., freq.; (37) M. a Twns.; (38) M. flavicornis Twas-; 
