57^ TRANS. ST. LOUIS ACAD. SCIENCE. 



rias F., h.; (3) P. troilus L., h.; (4) Pieris protodice Bd.-Lec. h.; (5) 

 Colias philodice Godt.. h., (6) Danais archippus F.; (7) Argynnis idalia 

 Dru.,h.; (8) A. cjbele F., h, ; (9) Phjciodes tharos Dru. ; (10) Thecla 

 titus F.; (11) Chrjsophanus thoe Bd.-Lec; (12) LjcTena comyntas 

 Godt. Pyraltd(L\ (13) Scepsis fulvicollis Hubn.. h. 



Hymenoptera. — AfidcB. (14) Apis mellifica L. ^ . h. ; (15) Megachile 

 brevis Say^ 9 \ (^6) M. montivaga C'r. 9 ; (17) Coelioxys S-dentata Say 

 9,h.c. Attdrenidie, (18) Augochlora humeralis Patton ^,c. Sfheci- 

 dce, (19) Ammophila intercepta Lap., h. ; (20) Sphex ichneumonea L. 

 h.; (21) Priononyx thomse F., h. ; (22) P. atrata Lep. 



Diptera. — TachinidK^ (23) Acroglossa hesperidarum Will., h. 



I have also seen the flowers visited by the ruby-throated humming- 

 bird, Trochilus coliibris L. 



Of the 15 species bearing pollinia of this plant, 14 have cor- 

 puscula fastened to the hairs of their legs, 3 have them on their 

 claws. 



Asclepias pitrpiirascois L. — This is also a butterfly-flower. 

 I have found it visited by the follov^^ing insects : 



Lepidoptera. — Rhopalocera, (i) Papilio phiienor L.; (2) P. cresphon- 

 tes Cram. ; (3) Colias'philodice Godt.; (4) Danais archippus F. ; (5) 

 Argynnis idalia Dru.. h. ; (6) A. cybele F., h. ; (7) Melitrea phaeton 

 Dru., h. ; (8) Pyrameis atalanta L., h. ; (9) Thecla acadica Edw. ; (10) 

 T. calanus Hiibn.; (11) Chrysophanus thoe Bd.-Lec; (12) Lyctena co- 

 myntas Godt.; (13) Pamphila zabulon Bd.-Lec; (14) P. peckius Kby. ; 

 (15) P. cernes Bd.-Lec. ; (r6) P. verna Edw. ; (17) P. manataaqua Scud. ; 

 (18) Eudamus pylades Scud., h. 



Hymenoptera. — ApidiK^ (19) Apis mellifica L. ^ , h. ; (20) Bombus 

 separatus Cr. 9 ; (21) B. vagans Sm. 9 '- (22) B. americanorum F. 9 ; 

 (23) Anthophora abrupta Say '^ 9 • Andi'enid<e, (24) Augochlora pura 

 Say 9 ; (25) Halictus confusus Sm. 9- Sphecida', (26) Priononyx atra- 

 ta. Lep. 



Diptera. — Tachtnt'dn^ (27) Acroglossa hesperidum Will., h. 



Ilemiptera. — Lysc'vidoi. (28) Lygneus fasciatus Dall., h. 



The flowers are also visited for honey by the humming-bird, Trochilus 

 colubris L., and are gnawed by Tetraopes tetraophthalmus. 



The S species of insects bearing pollinia of this Asclcpias have 

 the corpuscula attached only to their tarsal hairs. 



Acerates longifolia Ell.- — The list of visitors was observed on 

 19 days, between July 5 and Aug. i. The names of the insects 

 are followed by f., 1., t., or v.s., according as the corpuscula 



