1 889. J BOTANICAL GAZETTE. 299 



TT * 



Hymenoptera — Apidce: (i) Apis mellifica L., 8. and c. p. ; 

 (2) Bombus separatum Cr. 9 , s. ; (3) B. virginicus OH v. 9 , 

 s ; (4) B. americanorum F. 9 , s. ; (5) Synhalonia honesta 

 Cr. <? 9 , s. ; (6) Ceratina dupla Say <? s. ; (7) Osmia ligna- 

 ria Say £ , s. ; (8) Nomada sp. 9 , s. Andrenidcz: (9—1 1 ) 

 Andrena spp. ^?,s.; (12) Halictus sp. 9 , s. ; (13) //. con- 

 fusus Sm. 9 , s. ; (14) H. staltns Cr. 9 , c. p. 



Diptera — Bombyltdaz: (15) Bombylius Jratel/usWied. s. 



Syrp/iidce: (16) Syrphus ribesii¥.\ (17) Sphczrophoria cyl- 

 indrica Say, both f. p. 



Lepidoptera — -Rhopalocera: (18) Lyc&na comyntas Godt. ; 

 (19) Papilio ajax L. 



At Madison, Wis., in May, Prof. Trelease found it visited 

 by Ceratina dupla, Osmia albiventris, <? , and Pieris rapas. 



Geranium maculatum L. : ' — The flower agrees with the 

 larger flowered species (G. palustre and pratense) described 

 by Midler. The five outer stamens discharge their pollen 

 over the center of the flower, and afterwards the five inner 

 do the same. The anthers commonly fall off before the stig- 

 ma is receptive, and the power of self-fertilization is lost. I 

 have observed that the flowers change slowly in bad weather ; 

 some of them are in the male stage for three days and others 

 in the female stage for as long. But on warm fair days they 

 go through both stag?s on the same day. 



Some small insects light upon the petals and are able to 

 reach the nectar, though they are of doubtful value, since 

 they are by no means certain to touch the anthers and stig- 

 mas. Miiller found species of Halictus especially numerous 

 on G. palustre, and I have found several species of Andren- 

 idas on this plant : but the larger bees seem to be more use- 

 ful. 



Visitors (observed on seven days between May i and 

 21): Hymenoptera— Apida: (i) Apis mellifica L. 5 ; (2) 

 Bombus vagans Sm. 9 ; (3) B. americanorum F. 9 ; (4) Syn- 

 halonia speciosa Cr. $ ; (5) Ceratina dupla Say 9 ; (6) Os- 

 mia montana Cr. $ . Andrenidat: (7-9) Andrena spp. & 9 , 

 s. and c. p. ; (10) Augocholora pur a Say 9 ; (n ) Halictus 

 coriaceus Sm. 9 ; (12) ' H. pilosus Sm. 9 ; (13) H. conjums 

 Sm. 9 . 



Diptera— Empida: (14) Empis labiaia Lw. Syrphid : 



philus latif\ 



~~^ Macloski Box. Gaz., IX, 157. For references to literature of P°lH''ation of G«;r- 

 aniacea see Trelease ; North Am. Geraniawre, Mem. Bost. Soc Nat. Hlft, IV, 101. For u. 

 lustration of this species see Goodale: Wild Fls., PI. III. 



