﻿Lovell : The Insect-Visitors of Flowers 387 



Hub. C. Diptera — (a) Syrphidae : (14) Sphacrophoria cylindrica 

 Say; (15) Sericomyia militaris Walk. ; (16) 5. cJuysotoxoides Macq. 

 (17) Pipisa pisticoidcs Will.; (18) Criorhina intcrsistcnas Walk. 

 (19) Chilosia tristis Loew ; (20) BracJiypalpus marginatas Hunter 

 (21) Criorhina nigra Will. ; (22) Xanthogramma acqualis Lw. ; (b) 

 Muscidae : (23) Mordlia micans Macq. ; (24) Lnci/ia comicina 

 Fab. ; (25) Pyr cilia cadaverina L. ; (26) Mydaca alone Walk. ; (c) 

 Sarcophagidae : (27) Hclicobia hdicis Town. ; (28) Sarcophaga sp. ; 

 \d) Empididae : (29) Rhamphormyia minytus Walk. ; (c) Anthomy- 

 'dae: (30) Phorbia fuscipes Zett. ; (31) Phorbia sp. ; (/) Asilidae: 

 (32) Cyrtopogon chrysopogon Loew, one specimen ; (g) Stratiomy- 

 ldae •' (33) Odontoviyia intcrrupta Oliv., one specimen. D. Cole- 

 optera — (a) Elateridae : (34) Cardiophorns sp. ; (b) Lampyridae : 

 (35) Ellychnia corrusca L. ; (36) TeLphorus fraxini Say. July 1 1- 



July 



1. 



Cornus sto lo n i fer a Michx. Red-osier Cornel. 



Flowers white, in flat cymes, sweet-scented, honey abundant, 

 secreted by a brown fleshy ring at the base of the style. Stigma 

 covered with a viscid secretion and in a receptive condition when 

 the flower expands, the anthers dehisce within an hour. The 

 stamens stand nearly erect, are rather longer than the pistil and 

 nave their pollen-covered sides turned away from the stigma. The 

 flower is 1 cm. broad so that fertilization of the stigma by the 

 anthers of neighboring flowers does not occur. The flower of 



b"^ 1 "^ 



«j o 



fortius Canadensis L. is only 3 mm. wide. 



The abundance of the honey attracts frequent visits of bumble- 

 bees, but the number of diptera is much less than in C. Canadensis 

 L Two species of millers were collected upon the sweet-scented 

 flowers in the evening. 



Visitors: A. Hymenoptera— (a) Apidae : (1) Apis mdlifica 

 L -- $ ; (2) Bombns temarins Say, 3 ; (3) B. tcrricola Kirby, $ ; 

 (4) B. borcalis Kirby, 9; (b) Andrenidae : (5) Andrcna salicis 

 Rob., ?; (6)ProsopissparsaCv., 9 ; {?) Sphccodcs dechroa Sm., 3 ; 



(0 Eumenidae : (8) Ancistroceras capra Sauss., 3 ; id) Ichneu- 

 ni onidae: (9) Ichneumon Wilsonh fCr., 3; B. Diptera—<a) Syr- 



Phidae: ( 10) Syrp/ms rifesii I..; (11) Inpidia quadrat a Say; (b) 



Muscidae: (12) Pollenia rudis Fab.; (13) LudHa caesarL.; (14) 



