ROBERTSON FLOWERS A INSECTS, ASCL. TO SCROPII. 573 



Lepidoptera. — Bombycidiv, (7) Callimorpha fulvicosta* Clem., p. 

 Noctuidcp^ (8) Agrostis upsilon Rott. ; (9) Drasteria erechtea* Cram., p. 



It is a common thing to find dead hive-bees hanging to the 

 tlowers. It is evident, therefore, that, to effect the pollination of 

 A. Cornuti with certainty, an insect must be larger or stronger 

 than the hive-bee, or at least more able to free itself from the 

 flowers. 



The following visitors either do not extract the pollinia at all, 

 or could liardly be expected to transfer the pollinia to any great 

 extent without danger of losing their lives : 



Hvmenoptera. — Apidce. (10) Megachile brevis Say 9 i (n) Coelioxys 

 8-dentata Say %,'^,q. Andrenidte. (12) Augochlora lucidula Sm. 9 ? 

 (13) Halictus fasciatus Nyl. 9 • c. P/iilattt/iidce, (14) Cerceris clypeata 

 Dahlb. 



Diptera. — Strait'omyidce, (15) Odontomyia cincta Oliv. Bombylidce^ 

 (16) Hemipenthes sinuosa Wied. Co7iopid(^, (17) Stylogaster biannu- 

 lataSay. Syrphidce, (18) Eristalis dimidiatus Wied., p. t.; (19) Tropidia 

 mamillata Lw., p. ; (20) T. quadrata Say, h. ; (21) Syritta pipiens L., p. 

 Tackttiidce. (22) Trichopoda trifasciata Lw.. p.t. ; (23) Cistogaster divisa 

 Lw. ; (24) Jurinia apicifera Walk., p.; (25) Micropalpus sp. ; (26) 

 Frontina sp. . p. Attthomyidce, (27) Limnophora sp., p. 



Lepidoptera. — Rhopalocera, (28) Thecla calanus Hiibn. ; (29) Chry- 

 sophanus thoe Bd.-Lec. ; (30) Pamphila peckius Kby. ; (31) P. cernes 

 Bd.-Lec. ; (32) P. dionEdw. ; (33) Pholisora catullus F. SphiiigidtB^ 

 (34) Chserocampatersa L., h. Pyralidce. (35) Scepsis fulvicoUis Hubn.. 

 h. ; (36) Eurycreon rantalis Guen. 



Coleoptera. — Lampyridce^ (37) Photinus pyralis L.. h. 



Hemiptera. — LygividcB^ (38) Lygreus fasciatus Dall.. h. ; (39) L. turci- 

 cus F.. h.c. PetitatomidcB. (40) Euschistus variolaris P.B., h. ; (41) Po- 

 disus spinosus Dall., p., frequents the flowers for entangled insects. 



The following visitors may be expected to transfer the pollinia 



without ditilculty : 



Hymenoptera. — ApidcF, (42) Bombus separatus Cr. 9 ? • t. ; (43) B. 

 pennsylvanicus DeG. ^ ; (44) B. americanorum F. 9 > (45) J^Ielissodes 

 obliqua Say (^. p, Eumenidce. (46) Odynerus arvensis Sauss., h. P/ii- 

 lantliidce. (47) Cerceris bicornuta Guer., h. BembecidcB, (48) Bembex 

 nubillipennis Cr.. h. Sphecidce. (49) Pelopoeus cementarius, Dru. ; (50) 

 Sphex ichneumonea L., h. : (51) Priononyx atrata Lep., p. ; (52) P. 

 thom?e F., h. Scoliidce. (53) Myzine sexcincta F., h. ; (54) Scolia 

 bicincta F., h. 



* Kindly determined for me by Prof. G. H. French. 



