Robertson — Flowers and Insects. 437 
Rob. 9,8. and c¢. p., ; Vespidae: (28) Polistes metricus Say, s. Ten- 
sivatnidae? a0) Senne Ficus Say, s 
Dipter I tls a Sn (30) Steationyta quaternaria Lw., 8.; Hmpidae: 
(31) Rhamphomyia ; Conopidae: (82) Myopa vontulowa Say,s.; Syr- 
phidae: (33) Pipiza vita Will, 8.; (34) Chrysogaster nitida Wd.,s.; (35) 
Syrphus ribesii L., f. p.; (36) Subaeeanhalth sagt Say, s.; (87) Myiolepta 
Strigillata Lw., s.; (38) EriStalis aeneus F., s., freq.; (39) E. dimidiatus 
d., s.; (40) sets pipiens L., s.; Tachinidae: (41) Gonia frontosa Say, 
8.; Sarcophagidae: (42) Cynomyia sp., s.; (48) Sarcophagasp., s.; Muscidae: 
(44) sypesgaa atythancoghale Mg., 8.3; (45) Lucilia sp., s.; (46) * 
caesa ) L. cornicina F., s.; (48) L. latifrons Schin 
iad o) Chortophila sp., s.; Cordyluridae: (50) Ssatephtie 
squalida Mg., 
Lepidonern — Nymphalidae: (51) Danais archippus F., s.; (52) Pyrameis 
huntera F. 
epi = Cerambycidae: (53) Molorchus bimaculatus Say, s 
SPIRAEA ARUNCUS L.—The flowers of this plant are said by 
Miiller * to be devoid of honey, but I have seen insects sucking. 
If the flowers were destitute of nectar, the plants which bear 
only pistillate flowers, which of course supply no pollen, would 
not be visited by insects. This comes nearer to being a beetle- 
flower than any flower I have observed. Of the twenty-four 
species of insects taken on the flowers, fifteen are beetles. As 
far as observed the flowers bloom from June 6 to 16. June 
7th and 10th, the following visitors were taken :— 
Coleoptera — Dermestidae: (1) Anthrenus musaeorum L., ab.; (2) C. 
rhopalum haemorrhoidale Lec.; (3) C. triste Lec., ab.; (4) Orp shilus gira 
tus F., freg.; Cerambycidae: (5) sp.; (6) Euderces picipes F., ab.; 
Acmaeops directa Newm.; Chrysomelidae: (8) sp.; Bruchidae: (9) ekhas 
hibisci Oliv.; Mordellidae: (10) Mordella marginata Melsh., ab.; (11-12) 
~ asaagreng ae ; (18) M. biplagiata Heb. ; wr (14) Centrinus 
Picumnus Hbst., ab.; (15) Coleop. sp.— all f 
"Hymenoptera ndrentee: a Andrena sp. 2, s.; (17) A. rugosa Rob. ?, 
+} (18) A. crataegi Rob. 9, c. p.; (19) A. eressonii Rob. ni s.; (20) Halic- 
“id stultus Cr. 2, s.; (21) seomizen affinis Sm. ¢' 9, 8- and f. p., freq. 
Diptera—Empidae: (22) Empis distans Lw.., 8. ; Cucuisas (23-24) spp., Ss. 
In his garden at Lippstadt Miller found the flowers to be 
visited by four beetles and five other insects. 
Rusus occiwentaris L.— The flowers grow in quite incon- 
spicuous clusters, and open in succession. They expand as 
* Fertilization of Flowers, 224. + See Table III. 
