172 Trans. Acad. Set. of St. Louis. 



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

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

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

 M. grammica Lee. — all s. or f . p. 



Bees — Andrenidae: (11) Halictus pectoralis Sm. 9, s. & c. p.; (12) An- 

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

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

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



Diptera — Empidae: (19) Empis humile Coq. (MS.) ; (20) E. otiosa 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) Miiller, Befruchtung cler 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)— (4) Lubbock, 

 British wild flowers in relation to insects, 108. 1875. V. opulus. — (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 1 : 310) — (7) Henslow, On the 

 self-fertilization of plants. Trans. Linn. Soc. II. Bot. 1: 327. (1877.) 18S0. 

 V. opulus.— (8) Miiller, "Weitere Beobachtungen. Ill, 75. 1882.— (9) Kirch- 

 ner, Neue Beobachtungen uber die Bestaubung.«einrichtungen einheimis- 

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

 Akad. Hohenheim, 66. 1886. V. lantana. (Just 14 1 : 793)— (10) Hildebrand, 

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

 Jahrbiicher 17: 622-41. 1886. (Just 14 1 : 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 1 : 

 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 1 : 532-3) — (14) Fritsch, Caprifoliaceae. Engler 

 u. Prantl, Die nat. Pflanzenfamilien. IV. 4, 159. 1891. (Just 19 1 : 409)— (15) 

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

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

 249. 1S94. V. opulus, lantana. 



Stmphoricarfos Jus. — The observations made upou 8. 

 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 



