ROBERTSON — FLOWERS & INSECTS, ASCL. TO SCROPH. 593 



I observed the following visitors on 8 days, between July 7 and 

 August 1 1 : 



Hymenoptera. — Apt'd'e, (i) Apis mellifica L. 5,8.; (2) Bombus va- 

 gans Sm. ^ , s. ; (3) B. americanorum F. ^, s.; (4) Melissodes bimacu- 

 lata Lep. (^, s:\ (5) Ceratina dupla Say ^,s. Sc c.p. ; (6) Alcidamea 

 producta Cr. 9,s.; (7) Heriades carinatum Cr. 9» c.p. Andrem'dce, 

 (8) Agapostemon nigricornis F. (^9> s.;; (9) Augochlora pura Say (^ 

 9.S. &c.p. ; (10) Halictus coriaceus Sm. $.c.p.; (11) H. confusus Sm. 

 9, c.p. SphecidiKy (12) Ammophila procera Klug; (13) Sphex ichneu- 

 monea L. 



Lepidoptera. — Bkopalocera, (14) Pjrameis huntera F. ; (15) Chry- 

 sophanus thoe Bd.-Lec. ; (16) Lyc^na comyntas Godt. ; (17) Pieris ra- 

 pje L. Pyralidw, (iS) Scepsis fulvicoUis Hiibn.; (19) Nemophila noc- 

 tuella V. ; (20) Eurycreon rantalis Guen. — all s. 



Diptera. — Botnbyltd'.e, (21) Exoprosopa fasciata Macq., s. Syrphidce^ 

 (23) Mesograpta geminata Say, f.p. ; (23) Eristalis transversus Wied., 

 f.p. Tachinid(e, (24) Jurinia apicifera Walk., s. 



Hymenoptera. — Lygu'idie^ (25) Lj'gseus turcicus F., s. 



Seymeria macrophylla Nutt. — In the American Naturalist, 

 xix. 73, this flower is described and figured by Foerste, and I 

 have little to add to his description, except a list of visitors. The 

 tube of the corolla is strongly compressed horizontally, so that the 

 upper and lower walls are closely applied to each other. In the 

 throat the corolla is strongly bearded, which serves to exclude 

 small intruders, and enables the bees to hold on better when they 

 are collecting pollen. 



A bee with a proboscis 9 mm. long can reach the nectar from 

 the outside, while short-tongued bees can reach it by squeezing 

 into the throat. This cannot be accomplished with ease except 

 by the larger and stronger bees. 



The style is very short, so that there is nothing to prevent pol- 

 len from the anthers being carried back to the stigma. 



The plants are scattered under the trees on whose roots they 

 form parasitic attachments. The flowers are yellow, arranged in 

 interrupted, leafy spikes, and are not very conspicuous. 



The principal visitors are bumble-bees. On one occasion I 

 counted 67 individuals at work on the flowers. On 6 days, be- 

 tween July 38 and Aug. S, I observed the following visitors: 



Hymenoptera. — Apt'dK, (i) Apis mellifica L. 5,8., one; (2) Bom- 

 bus vagans Sm. j^ , s. iS: c.p., ab. ; (3) B. americanorum F. ^.s. &c.p., 



V-— 3— I 7 



