ROBERTSON — FLOWERS & INSECTS, ASCL. TO SCROPH. 581 



Sjnhalonia speciosa Cr. f^^^jS.; (10) S. honesta Cr. $ , s. ; (ii)S.atri- 

 ventris Sm. J^, s. ; (12) Osmia albiventris Cr. 9 , c.p. Andrenidte, (13) 

 Augochlora pura Say 9; (h) Halictus confusus Sm. ^ — both crawling 

 into tube. 



Lepidoptera. — Rhopalocera, (15) Danais archippus F. ; (16) Pyra- 

 meis atalanta L. ; (17) Papilio troilus L. ; (iS) Nisoniades juvenalis F. 

 — all s. Sp7iittffid(X'. (19) Hemaris thysbe F.. s. 



Diptera. — Bombylidiv, (20) Bombylius fratelliis Weid., s. Syrphidm, 

 (21) Rhingia nasica Say. s. & f.p.; (22) Teuchocnemis literatus Lw., f.p. 



According to Schneck,* this flower is perforated by a, bumble-bee — 



either B. americanoriim or B. pe^insylvanicus. Only female bumble-bees 



lly wiiile Meriensia blooms, and. since the females of both of these bees 



can easily drain deeper flowers. I see no reason why they should make 



holes in this flower. 



CONVOLVULACE.E. 



Ifomosa pandurata Meyer. — Insects can crawl into the tube 

 of the corolla as far as three centimetres. The nectar, which is 

 secreted by a fleshy disc surrounding the base of the ovary, is 

 concealed by the broad, hairy bases of the filaments, between 

 which bees must insert their proboscides. The stamens are of un- 

 equal length, so that some of the anthers reach beyond the stigma. 



The flowers are very large and white, with purple in the bot- 

 tom of the tube. A proboscis 14 mm. long can reach all of the 

 nectar. The flower is visited mainly by a remarkable assemblage 

 of bees of characteristic American genera. The following were 

 observed on eight days, between July ir and Aug. 36: 



Apidce, (i) Bombus separatus Cr. rj*, s.; (2) B. americanorum F. 9 

 § 1 s. ; (3) Entechnia taurea Say (j^ 9 . s., ab. ; (4) Emphor bombiformis 

 Cr. ,^', s., one; (5) Xenoglossa ipomoeje Rob. ,^9'S.. ab.; (6) X. 

 pruinosa Say 1^ 9 • s-, ab. ; (7) Melissodes bimaculata Lep. {f'9i s- & 

 c.p.. ab. 



Convolvulus sepiujn L. — In Europe the distribution and fer- 

 tility of this plant is supposed to have some relation to the distri- 

 bution of Sphinx convolvuli^^ though jMiiller has found it visited 

 by other insects b}' day. 



On 3 days, between June 29 and July 27, I found it visited in 

 sunlight by the following insects : 



Apida-. — (i) Bombus americanorum F. 9 $ ' ^-j ^^-i (2) Anthophora 

 abrupta Say 9 > s- ! (S) Entechnia taurea Say ^, s. ; (4) Melissodes bi- 

 maculata Lep. (^, s.; (5) Ceratina dupla Say 9> s. 



* Bot. Gazette, xii. iii ; xiii. 39. t Fertilization of Flowers, 424. 



