Robertson — Floivers and Insects. 175 



4 : iC, 41. 1892. — (20) Knuth, Blumen unci Insekten auf den Nordfriesischen 

 Inseln, 81. 1894.— (21) Loew, Bliitenbiologische Floristik, 147, 250, 391. 

 1894. S. racemosus. — (22) Knuth, Weitere Beobachtungen iiber Blumen 

 nnd Insekten auf den Nordfriesischen Inseln. Schr. d. Nat. V. f. Schleswig- 

 Holstein, 10: 235. 1895, 



Aster ericoides L. var. villosus Torr. & Gr. — A. 

 ericoides pilosus (Willd.) Porter — This is a common plant, 

 having rather small heads with yellow discs and white rays. 

 It blooms from Aug. 21 to Oct. 17. The following visitors 

 were taken on the flowers on Sept. 14, 18, 20-24, 26, 28 and 

 Oct. 8 and 10 :— 



Hymenoptera — Apidae: (1) Apis melliflca L. ^, s.; (2) Bombus 

 virginicus Oliv. (5^g, s. & c. p. ; (3) B. araericanorum F. (f^, s. ; (4) B. 

 separatus Cr. cf ^ , s. ; (5) Melissodes confusa Cr. cf ? , s. & c. p., f req. ; (6) 

 M. nivea Rob. 9> s. & c. p., freq.; (7) M. autumnalls Rob. $,8. &c. p., 

 ab. ; (8) Ceratina tejonensls Cr. J^, s. freq.; (9) C. dupla Say 9, 8.; (10) 

 Megachile latimanus Say 9, s. & c. p. ; (11) Heriades carinatum Cr. 9> ^' ^ 

 c. p.; (12) Coelioxys altilis Cr. ?, 8.; (13) C. dubitata Sm. ?,.8.; (14) 

 Epeolus cre3Sonii Rob. ?, s. ; (15) E. illinoensis Rob. c^9, 8.; (16) E. 

 pectoralis Rob. ^i s.; (17) E. donatus Sm. 9,s.; (17) Nomada vicina Cr. 

 (^, 8.; (18) Calliopsis asteris Rob. J*?* s. & c. p.; in cop., ab.; (19) C. 

 compositarum Rob. (^9, s. & c. p., in cop., ab.; (20) C. andreniformis Sm. 

 9, s. & c. p.; (21) Perdita 8-maculata Say 9« s. & c. p.; Andrenidae: (22) 

 Halictus foxii Rob. ?, s.; (23) H. coriaceus Sm. (^, s. ; (24) H. llgatus Say 

 (^, s. ; (25) H. pilosus Sm. (f, s.; (26) H. confusus Sm. (^, s.; (27) H. 

 stultus Cr. (^, s.; (28) Agapostemon viridula F. 9,8. & c. p.; (29) A. 

 radiatusSay ?, s.; (30) Augochlora para Say ?, s. ; (31) A. similis Rob. 

 9, 8.; (32) Andrena asteris Rob. (^9> s. &c. p.; (33) A. solidaginis Rob. 

 J^9» 8. & c. p., freq.; (34) A. nubecula Sm. 9» s. & c p.; (35) Colletes 

 americana Cr. (^9» s. & c. p., freq.; (36) C. compacta Cr. (^9» s. & c. p., 

 freq.; (37) Sphecodes stygius Rob. 9> s. ; (38) Prosopis pygmaea Cr. 9» 

 s.; (39) P. modesta Say 9i s.; Vespidae: (40) Vespa maculata L. ; (41) V. 

 germanica F., freq.; (42) V. cuneata F. ; (43) Polistes metricus Say; (44) 

 P. annularis L.; (45) P. pallipes Lep. ; Eumenidae: (46) Eumenes fraternus 

 Say; (47) Odynerus sp.; (48) 0. capra Sauss. ; (49) 0. campestris Sauss. ; 

 (50) O. tigris Sauss.; (51) O. forminatus Sauss.; (52) O. anormis Say; 

 Mimesidae: (53) Mimesa cressonii Pack.; Philanthidae: (54) Cerceris 

 clypeata Dlb.; (55) C. fulvipes Cr. ; Sphecidae: (56) Ammophila gracilis 

 Lep.; Scoliidae: (57) Scolia bicincta F. ; Ichneumonidae : (58) Metopius 

 polycinctorius Say var. — all s. 



Diptera — Empidae: (59) Empis clausa Rob. (MS.); Bombylidae: (60) 

 Argyramoeba albofasciata Mcq.; (61) Anthrax alternata Say, freq.; (62) 

 Sparnopolius f ulvus Wd. ; (63) Systropus macer F., freq. ; (64) Toxophora 

 amphitea Wlk. ; Conopidae: (65) Zodion fulvifrons Say; (66) Z. nanellum 

 Lw.; Syrphidae: (67) Syrphus ribesii L., freq.; (68) S. americanus Wd. ; 

 (69) Xanthogramma emarginata Say; (70) Allograpta obliqua Say; (71) 

 Mesograpta marginata Say; (72) M. geminata Say; (73) Sphaerophoria cyl- 



