cc The Botanical Gazette. 
species. The Muscide are also more abundant while Clema 
tis Virginiana is in bloom. It seems that bees and Syrphitla 
therefore, are less abundant on the Clematis on accountof 
the competition of the lower Hymenoptera and the other 
Diptera. 
As far as I have observed in my neighborhood, this is the 
latest blooming of the Ranunculacez. By late bloomingit | 
gains the signal advantage of avoiding competition with such 
allies as Ranunculus, Isopyrum, Anemonella, etc., and it finds ; 
the general antfophilous "Msect fauna™at its maximum. Is” 
period overlaps with the periods of C. Pitchert and Anemm 
Virginiana. C. Pitcheri, its congene®, is hardly a competitor 
since, as observed below, it is adapted to bumble-bees. 
Anemone, being a pollen flower, also avoids competition 
some €xtent by attracting a different set of insects. 
The following insects were taken from the staminate flor 
ers on July 27th, 28th, 30th and August 3d: 
HYMENOPTERA.—A pidae: (1) Apis mellifica L.% %: CE 
Bombus virginicus Oliv. 8, s. and c. p.; Amdrenidae: (3) Hal 
ictus zephyrus Sm. 9, s. and c. p.; (4) H. confusus Sm. 
s. and c. p.; (§) H. stultus Cr. 49, s. and ¢. ps the a 
abundant visitor; (6) H. cressonii Rob. 4; (7) Sphecodes # 
vensis Pttn. 4, s.; (8) S. confertus Say? s.; (9) Prosopt 
affinis Sm. 89, s.; Eumenidae: (10) Odynerus tigris Sauss..§) 
(11)O.foraminatus Sauss. ,s.; Crabronidae : (12) Crabro mint” 
ics 65 (ES) C: interruptus Lep., s.; (14) Oxybelus me 
Say, s.; Myssonidae: (15) Nysson plagiatus Cr., sh 
(16) Pelopoeus cemenrarius Dru., s.; (17) Isodontia phi 10 
phica Lep., s.; (18) Sphex ichneumonea L., s.; Scoliidac: (9 
Scolia bicincta F., s. ig 
DIPTERA.—Conopidae: (20) Oncomyia loraria LW, 
Syrphidae: (21) Platychirus quadratus Say; (22) ' 
obliqua Say; (23) Mesograpta marginata Say; (24) SP 
Phoria cylindrica Say; (25) Eristalis transversus Vd. 
Syritta pipiens L.; Tachinidae: (27) Exorista sp-; (28) 
globosa Twns.; (29) Hyalomyia purpurascens . 
Jurinia apicifera Wik.; (31) J. smaragdina Mcq-; (3?) 
palpus fulgens Mg.; (33) Frontina flavicauda Riley 
Siphona illinoensis Twns.; (35) Miltogramma @ 
Twns. ; (36) Sarcomacronychia aurifrons Twns.; 
tdae: (37) Sarcophaga sp. ; Muscidae: (38) Calliphora 
cephala Mg.; (39) Graphomyia sp.; (40) Lucilia SP- 
ad 
az 
