156 BOTANICAL GAZETTE [Aucus1 
Ptelea goes out of bloom. Of the twelve species of lower Hymen- 
optera taken on Plea, not one is flying during the period of 
Xanthoxylum. The inflorescence of Pre/ea is more favorable for 
their visits. ; 
The principal pollinators are Andrenide. May 28th, 30thand 
June Ist, 4th and 8th the following list was observed: 
HyMENOPTERA—A fide : (1) Apis mellifica L. ¥,s., freq.; Andrenide: (2) 
Halictus coriaceus Sm. 9, s.; (3) H. ligatus Say 9, s.; (4) H. lerouxii Lep. % 
s.; (5) H. cressonii Rob. 9, s. & c. p.; (6) H. pilosus Sm. 9, s.; (7) H. com 
fusus Sm. 2, s. & c. p.; (8) H. stultus Cr. 9, s. & c. p.; (g) H. tegularis Rob. 
@, 8. & c. p.; (10) Agapostemon radiatus Say, 9, s.; (11) Augochlora pur 
Say, 2s.; (12) Andréna roberteonii D. T., 2, s. & c¢. p., freq.; (13) A. platy 
paria Rob. 39, s. & c. p.; (14) A. cressonii Rob. 9, s.; (15) A. bipunctata Cr. % 
s.& c. p., freq.; (16) A. nuda Rob. ¢, s. & c. p.; (17) A. rugosa Rob. 2, $5 
(18) A. spirzeana Rob. 49, s.; (19) A. hippotes Rob. 9, s. & ¢. p., abs; (20) A. 
claytonie Rob. 9, s., freq.; (21) A. crataeegi Rob. 9, s. & c. p.; (22) Sphecodes 
confertus Say ¢, s., freq.; (23) Prosopis modesta Say, 4, $.; Eumenide : (24) 
Eumenes fraternus Say, s.; (25-27) Odynerus spp., s.; (28) O. unifascia’m 
Sauss., s.; (29) O. tigris Sauss., s.; (30) O. foraminatus Sauss., S.; Crabronide : 
(31) Oxybelus illinoensis Rob. (MS), s.; Philanthid@ : (32) Cerceris cone 
Cr., s.; Sphecide: (33) Ammophila vulgaris Cr., s.; Scolitde: (34) Elis con 
fluenta Say, s.; Chalcidide : (35) Leucospis affinis Say, s. a 
DIPTERA—Stratiomyide : (36) Stratiomyia meigenii W4d.; Conopide (37), ; 
Conops brachyrhynchus Mcq,, s.; (38) Myopa vesiculosa Say, $+; ee . 
(39) Sphzerophoria cylindrica Say, s.; (40) Myolepta nigra Will si (44 me 
Volucella vesiculosa F., s.; (42) Mallota cimbiciformis Fil. f. bautias ee 
S.; (43) Syritta pipiens L., s.: Zachinide : (44) Trichopoda sp., 5; (45) Jum 
smaragdina Mcq., s.; (46) J. apicifera Wlk., s.; (47) Micropalpus fulgens 
8. 8.; Muscide : (48) Lucilia cornicina F., s.; Anthomyide : (49) Phorbie 
fusciceps Zett. 2g 
eterocer™ 
LEPIDOPTERA—Rhopalocera : (50) Neonympyha eurytris F..S.; . 
(51) Alypia octomaculata Hbn. 
Trelease (MS notes) captured the following insects 0” " 
flowers: 
HYMENOPTERA—A fide : (1) Psithyrus (Apathus) laboriosus F., 
Nomada sp.; Andrenide : (3) Halictus pilosus Sm., 2; (4) Andren? 
Rob., %; (5) A. illinoensis Rob., ¢; (6) A. crateegi Rob., 25 (7) meee 
viridulus F., 9; (8) Sphecodes confertus Say, 23 (9) Prosopis we 
9% Vespide: (10) Vespa germanica F.; (11) Polistes metricus Say; a 
