1892. ] Flowers and Insects. 275 
amous. The stamens are so strongly divergent that spon- 
taneous self-pollination is impossible. Nectar is wanting, the 
object of insect visits being the pollen. The plant is common 
and was observed in bloom from June 15th to July 25th. June 
17th, 23d and 24th, the following visitors were noted: 
Hymenoptera—A pide: (1) Apis mellifica L. 3, freq., (2) 
Ceratina dupla Say 9; Andrenid@: (3) Halictus zephyrus Sm. 
9, ab.; (4) H. confusus Sm. 9, ab.; (5) H. stultus Cr. 9, ab.— 
all collecting pollen. 
Diptera—Bombylide : (6) sp. ;(7) Hemipenthes sinuosa Wd.; 
Syrphide: (8) Chrysogaster nitida Wd., ab.; (9) Syrphus ri- 
besii L.,freq.; (10) Allograpta obliqua Say, freq.; (11) Meso- 
gtapta marginata Say; (12) Eristalis dimidiatus Wd. ; Musci- 
de: (13) Lucilia cornicina F.; Anthomyid@: (14, 15) Chorto- 
phila spp.—all feeding on pollen. ‘ 
Coleoptera—Dermestide : (16) Attagenus piceus Oliv. ; Mal- 
achide: (17)Anthocomus erichsoni Lec. ; Cerambycide: (18) 
Euderces picipes F.; Mordellide: (19) Pentaria trifasciata 
Melsh.—all feeding on pollen. 
HOUSTONIA PURPUREA L., VAR. CALYCOSA Gr.—This com- 
mon plant grows in tufts or clusters which are rendered quite 
Conspicuous by the abundant white flowers, the stems rising 
abo 
the stigma. The anthers of the short-styled form are in the 
hele of the mouth of the tube, the stigma of the long-styled 
orm being*more strongly exserted. : 
The anthers of the long-styled form apply their pollen to 
the proboscides of the visitors. The anthers of the short- 
ge form dust their pollen indefinitely upon all parts of the 
sigs Accordingly the long-styled form has a larger 
atina, Calli- 
“fe and Halictus, but are also visited by flies, beetles and 
utterflies, Butterflies, however, are only adapted to pollin- 
ate the short-styled form, since they can suck this form with- 
