Robertson — Flowers and Insects. 445 
OP, 8; (9) A. flavo-clypeata Sm. (9, s. - p., ab.; (10) A. ziziae 
Rob. oj’, s., freq.; (11) A. rugosa Rob. PL te Shee aiae Rob. <j, 8., 
freq.; (13) A. crataegi Rob. ¢'9,8., ab.; (14) Halictus lerouxii Lep. Q, s.; 
(16) H. ligatus Say 9, s.; (16) H. “fheclatus Nyl. 9,.8.,: freq.; 17) H. 
aide Sm. 9, s., freq.; (18) H. confusus Sm. 9, s.; (19) H. stultus Cr. 
©,8.; Vespidae: (20) Polistes metricus Say, s., freq.; (21) P. pallipes Lep., 
8,3 Seoliidae: (22) Tiphia inornata Say, s. 
iptera — Empidae: (23) Empis sp., s.; Bombylidae: (24) Bombylius 
major L. ” 8.5 ik (2) Myopa vesiculosa Bays s.; Syrphidae: (26) 
(29) Mesograpta pambiste Say; (30) Myioleyin: strigillata I w., freq.; (31) 
Eristalis aeneus F.; (32) E. dimidiatus Wd.; (33) Helophilus similis Mcq.; 
(34) Mallota cimbiciformis Fll. —all s. or f.p.; Tachinidae: (35) Gonia fron- 
tosa Say, s.; Sarcophagidae: (36) Cynomyia sp., 8.; (37-38) Sarcophaga 
SPp., 8.5 re: (39) Calliphora erythrocephala Mg., s.; (40) Lucilia sp., 
8.; (41) L. sie s.; (42) L. pag s., freq.; (43) Compsomyia 
macellaria i, 44) Cyr toneura sp. 
Coleoptera — ~ oer: (45) Wonadiatee: 15 —maculata Muls., s.; 
(46) Coccinella sanguinea L., s.; Scarabaeidae: (47) Euphoria fulgida F., s. ; 
Cerambycidae: (48) Molo ane bosnewiiees Say, s-, freq., in cop.; Chrysome- 
lidae: (49) “exc vittata F., f. p.; Caitenebidaks (50) Asclera puncti- 
collis Say., 
bnidninn ics Npmaphandaes (51) Danais archippus F., s.; (52) Pyrameis 
huntera 
CRATAEGUS cRUS-GALLI L.— This species resembles the 
preceding. The trees are even more conspicuous with the 
white blossoms. It blooms later — May 20 to June 1— 
and consequently shows an increase in Aculeate Hymenoptera. 
With the exception of No. 8, which was taken on May 29, 
all of the visitors were observed May 22. 
Hymenoptera — Apidae: (1) Apis sr oats L. 8,8. rine Ze ,ab,; (2) Bom- 
bus regains Oliv. 2, s.; (3) B. americanorum F. 9, (4) B. pennsyl- 
aa DeG. 2, s.; (5) B. separatus Cr. oF s.; ‘ syauaiowie speciosa Cr. 
(6 
nes Ceratina pee Say ’, s.; (8) Megachile infragilis Cr. <j’, 8.; (9) 
Hitades piiiadeion Rob. g', s.; (10) Panurgus (?) andrenoides Cr. 2 8 <3 
ae dae: (11) Andrena sp. 9, 8.and c. p.; (12) A. bicolor F. 2, s. and 
p.; (18) A. sayi Rob. 9, s. and c. p.; (14) A. cressonii Rob. 2, 8. and 
p., freq.; (15) A. flavo-clypeata Sm. ¢'Q, s. and c. p., the most abun- 
dant visitor; (16) A. ziziae Rob. ¢'Q9, s. and c¢. age (17) A. forbesii 
ob. 9,8. and c. p.; (18) A. claytoniae Rob. 9, and - eat ; (19) A. 
crataegi Rob. 79,58. andc. p., ab.; (20) Halictus peacitis b. 9, 8. and 
c. p., freq.; (21) H. seamen Sm. 9,8. and c.p.; (22) H. auc Nyl. 9, 
s § 
stultus Cr. 9, s. andc. p., ab.; (27) H. iets Rob. 9,8 req 
(28) Augochlora iii Rob. 9 , 8. and c. p., freq.; (29) itis peaeoe 
Say 9, s. and c. p.; (30) Prosopis sp. 3; 8.3 (31) P. affinis Sm. ¢'@, s., ab.; 
