38 THE AMERICAN NATURALIST. | [Vor. XXXIV. 
Visitors : Hymenoptera — Apidæ : (1) idt mellifica L., 9; 
Andrenidæ: (2) Andrena vicina Sm., 9. 
Diptera — Syrphidæ : (3) Syrphus ribesii L. 
Coleoptera — Cerambycide: (4) Pachyta monticola Rand; 
Mordellidæ : (5) Anaspis rufa Say. Waldoboro, May 19 to June. 
Sambucus canadensis L. American Elder. 
The broad, flat cymes are very numerous and conspicuous. 
The flowers attract very few visitors, as they contain no honey 
and bloom at midsummer, when they come in competition with 
many nectariferous blossoms. Only four species of flies have 
been collected, and repeatedly the blossoms were examined 
without observing a single visitor, and yet upon the jewel-weed 
(Impatiens) and the red-osier cornel, a few yards away, scores 
were at work. The perfume is agreeable and increases in the 
evening, but fails to attract crepuscular insects. The stamens 
are slender, surpassing the nearly sessile stigmas. 
Visitors: Diptera — Syrphidæ: (1) Mesogramma marginata 
Say; Sarcophagide: (2) Helocobia helicis Town.; Muscide: 
(3) Lucilia cornicina Fab. ; Anthomyide : (4) Phorbia fusciceps 
Zett. Waldoboro, July. 
Sambucus nigra L. Black Elder. 
A variety of this species, S. zzgra laciniata (Mill.) DC., has 
escaped from cultivation at Cape May, N. J. According to 
Knuth, the flowers of S. zzgra are yellowish-white, honeyless, 
and conspicuousness is gained by their aggregation in a dense 
corymb. There are few visitors, partly because the strong 
scent is probably repellent to bees, and partly because of the 
absence of nectar. In the Island of Föhr, Knuth collected two 
flies feeding upon the pollen, and in Helgoland a single fly, 
Lucilia cesar. In middle and southern Germany, Müller 
observed six flies, two beetles, and one sawfly. 
VIBURNUM L. 
There are fourteen species in the Northern States. The 
flowers are in compound cymes, which bloom in early spring 
or midsummer, and are white, fragrant, and nectariferous. 
