574 TRANS. ST. LOUIS ACAD. SCIENCE. 



Lepidoptera. — Rhofalocera, (55) Papilio philenor L. ; (56) P. aste- 

 rias F, ; (57) Colias philodice Godt. ; (58) Danais archippus F., h. ; (59) 

 Argynnis idalia Dru. ; (60) A. cybele F., h. ; (61) Grapta interrogalionis 

 F., h.t. ; (62) Vanessa antiopa L., h.c; (63) Pyrameis atalanta L., h. ; 

 (64) Limenitis disippus Godt.; (65) Eudamus lycidas Sm.-Abb.. h.; 

 (66) E. tityrus F. 



Diptera. — MtdasidcB, (67) Midas clavatus Dru., t. 



Coleoptera. — Scarabcsida;, (68) Trichius piger F. 



I have also found these beetles gnawing the flowers : Melatiotus com- 

 mu7iis Gyll.. Macrodactylus angustaius Bv., and Tetraopes tetraophthal- 

 mus Forst.; plants growing in my yard were freed from the latter pest by 

 the rose-breasted grossbeak, Habia liidoviciatta. 



Of the 39 species bearing" pollinia of this Asclepias^ 30 have 

 the corpuscula on the hairs of their legs, 15 have them on their 

 pulvilli, 6 have corpuscula attached to their tongues, and 5 have 

 them attached to their claws. 



Asclepias SnUivautii Engelm. — The insect visitors of this 

 plant v^^ere observed on 25 days, between June 22 and Aug. 20. 

 The anther wings are much longer and stronger than in A. Cor- 

 miti^ and the hoods are deeper. Accordingly, the number of 

 insects which can pollinate the flower with safety is not so great. 



Insects of the following species were found dead on the 

 flowers ; they must, therefore, be regarded as not adapted to 

 the flowers, although some of them may sometimes effect pol- 

 lination : 



Hymenoptera. — Apidif, (i) Apis mellifica L. ^, and one '^ , c.p.t. ; 

 (2) Xenoglossa pruinosa Say 'J, , c, one; (3) Megachile infragilis Cr. 

 '^ , c, one: (4) M. brevis Say 'J, 9' c. Attdrenidce. (5) Halictus lerouxii 

 Lep. % , p.c. ; (6) H. ligatus Say '^ , c. ; (7) H. fasciatus Nyl. % . c. Lar- 

 ridcs. (8) Astata unicolor Say, one. Sphecidce^ (9) Isodontia philadel- 

 phica Lep., h.c. one. 



Diptera. — BombylidcB^ (10) Sparnopolius fulvus Wied., one. Syr- 

 phid(E, (11) Eristalis seneus F., c, one; (12) Syritta pipiens L.. one. 

 Muscidce, (13) Lucilia cornicina F. 



Lepidoptera. — Rhopalocera, (14) Pamphila peckius Kby.. p. Pyyali- 

 d(B. (15) Scepsis fulvicoUis Hiibn. 



Coleoptera. — Scarab(zidce, (i6) Trichius piger F,, c. 



This list plainly indicates that only the largest insects are 

 adapted to transfer the pollen of this Asclepias. 



