1886.] BOTANICAL GAZETTE, ‘263 
tes and P. Turnus as high as 9mm, H. Miiller gives a figure of 
the leg of a butterfly showing eleven corpuscula, seven of which 
are fastened above the claws, four forming a combination ona 
tibial spur. *Dr. A.S. Packard, Jr., figures a Tachytes (?)’ show- 
ing pollinia much as they appear on visitors of the smaller flow- 
ered species. In addition to those mentioned above, I have 
found, among the visitors of A. incarnata, A. verticillata and A. 
tuberosa, insects of the following genera with pollinia upon the 
hairs of the tarsi above the claws: Apathus, Melissodes, Cera- 
‘tina, Magachile, Epeelus, Halictus, Vespa, Polistes, Odynerus, 
Cerceris, Crabro, Pelopoeus, Ammophila, Stizua, Bembex, As- 
tata, Tachytes, Pompilus, Priocnemis, Myzine, Pieris, Colias, 
Libythea, Conops, Midas, Trichisa, and Euphoria. A theory of 
pollination can not, therefore, be limited to an account of the in- 
sertion of pollinia which are attached to the claws; and it is 
34 specimen of Sphex Pennsylvanica in the collection of Prof.S. A. Forbes at Cham- 
paign, Ill., has pollinia which I refer to A. Sul-ivantii s y situated on its legs. 
fig. 1 ; 
5 Am. Nat, vol. I., p. 105, and * Guide to the Study of Insects’’, p. 165. Dr. Packard. 
regards the tarsus as that ‘‘ of a wasp belonging probably ”’ to Tachytes. Mr. W. H. Patton, 
in Proc. Bost, Soc. Nat. Hist., XX., p. 397, says, ‘Indeed. that figure bears @/resemblance 
to the tarsus of Tachytes, but represents tolerably well the tarsus of Sphex, an insect of a 
different family ’’. 
