172 Trans. Acad. Sci. of St. Louis. 



Hoplia trifasciata Say, freq.; (5") Euphoria fulgida F.; (6) VaIo;us canalicu- 

 latus F. ; Cerambycidae: (7) Molorchus bimaculatus Say, ab.; Mordellidae: 

 (8) Mordellistena blplagiata Hel.,freq.; (9) M. aspersa Mels., freq.; (10) 

 M. grammica Lee. — all s. or f . p. 



Bees — Andrenidae: (11) Halictus pectoralis Sm. $, s. & c. p.; (12) An- 

 drena sayi Rob. $, s.; (13) A. serotina Rob. $, s. & c. p.; (14) A. cressonii 

 Rob. $ , s. & c. p. ; (15) A. nuda Rob. 9 , s. ; (16) A. rugosa Rob. ? , s. ; (17) 

 A. claytoniae Rob. $,s. ; (18) Prosopis modesta Say 9> s. 



Diptera — Empidae: (19) Empis huniile Coq. (MS.); (20) E. otlosa Coq. 

 (MS.); (21) E.distans Lw.; (22) Rhamphomyia priapulus Lw. ; Tachinidae: 

 (23) Siphona illinoensis Twns. — all s. 



On the pollination of Viburnum see: — 



(1) Sprengel, Das entdeckte Geheimniss, 21, 33, 43, 82, 159-60. 1793.— 

 (2) MiiUer, Befruchtung der Blumen, 364. 1873. Fertilization of Flowers, 

 291. 1883.— (3) Delpino, Ulteriori osservazioni. II. 2: 238, 311. 1875. 

 Atti d. Soc. Ital. d. Sci. Milano 17:—. 1874. (Just 2: 882)— r4) Lubbock, 

 British wild flowers in relation to insects, 108. 1875. V. opuliis. — (5) Dar- 

 win, Forms of Flowers, 6, 7. 1877. — (6) Errera et Gevaert, Sur la structure 

 et les modes de f^condation des fleurs. Bull. Soc. Roy. Bot. Belgique 17: 

 146. 1878. Fls. agamo-monoiques. (Just 6^: 310)— (7) Henslow, On the 

 self-fertilization of plants. Trans. Linn. Soc. II. Bot. 1: 327. (1877.) 1880. 

 V. opulus.—{S) MuUer, Weitere Beobachtungen. Ill, 75. 1882.— (9) Kirch- 

 ner, Neue Beobachtungen iiber die Bestilubungseinrichtungen einheimls- 

 cher Pflanzen. Progr. 68 Jahresfeier d. K. Wiirttemb. landwirtschaftl. 

 Akad. Hohenheim, 66. 1886. V. lantana. (Just 141; 793)— (10) Hildebrand, 

 Ueber die Zunahme des Schauapparates bei den Bllithen. Pringsheim's 

 Jahrbiicher 17: 622-41. 1886. (Just 14^: 804)— (11) Loew, Blumenbesuch 

 von Insekten an Freilandpflanzen. Jahrbuch Bot. Gartens Berlin 4: 167. 

 1886. — (12) Schulz, Beitrage zur Kenntniss der Bestaubungseinrichtun- 

 gen und Geschlechtsvertheilung bei den Pflanzen 2: 95. 1890. (Just 18^: 

 519)— (13) Kerner, Pflanzenleben 2: 183, 195, 324. 1891. Oliver Transla- 

 tion 2: 187, 200, 326. 1895. V. opulus, lantana, peripheral fls., aminoid 

 scent, geitonogamy. (Just 17^: 632-3) — (14") Fritsch, Caprifoliaceae. Engler 

 u. Prantl, Die nat. Pflanzenfamilien. IV. 4, 159. 1891. (Just 19i: 409}— (15) 

 MacLeod, Bevruchting der bloemen van Vlaanderen. Bot. Jaarboek. 5: 254, 

 389. 1893. 6:372-3,438. 1894.— (16) Loew, Bliitenbiologische Floristik, 

 249. 1894. V. opulus, lantana. 



Symphobicarpos Jus. — The observations made ui^on S. 

 racemosus indicate an adaptation to wasps. Although the 

 flowers are visited by other insects, the wasps usually occur in 

 numbers which in proportion to other guests are only observed 

 in cases of flowers which have been regarded as wasp flowers. 

 There is certainly nothing to indicate an adaptation to the 



