98 
Psyche 
[April 
evidently developed as a predaceous organ, but is also used for 
sucking nectar. Paremyis clausa is evidently exclusively an- 
thophilous. It flies 113 days after all of the other species have 
disappeared. Being 4 per cent of the species, it makes 27 per 
cent of the visits. 
Stratiomyidce. — Of 53 visits of 13 species to 36 flowers, 45.2 
per cent are to Mis, 43.3 to Pol, 60.3 to white, 35.8 to yellow 
and 41.5 to Umbelliferse. Red shows 3.7, in the Alps 40.0. 
Tachinidoe. — Of 842 visits of 108 species to 158 flowers, 
53.4 per cent are to Mis, 29.8 to Pol, 66.5 to white, 25.2 to 
Umbelliferae and 33.9 to Compositse. After June the maximum 
shifts from A 37.5 to B’ 46.3. White changes from 59.3 to 
70 . 1 and yellow from 37 . 5 to 26 . 0. 
Other Calyptratce.—Oi 692 visits of 50 species to 140 flowers, 
48 . 2 per cent are to Mis, 29 . 6 to Pol and 64 . 5 to white. 
Of total Calyptratse visits, 23 per cent are to Umbelliferae 
and 25.5 to Compositae. 
Acalyptratce. — Of 178 visits of 53 species to 59 flowers, 47.1 
per cent are to Pol, 43.8 to Mis, 55.0 to white, 43.8 to yellow, 
58 . 4 to Umbelliferae and 12 . 3 to Compositae. 
Muscoidea. — Of 1712 visits of 211 species to 191 flowers, 
50.3 per cent are to Mis, 31.6 to Pol, 64.3 to white, 31.7 to 
yellow, 26.6 to Umbelliferae and 28.3 to Compositae. Pol is 12 
per cent of flowers visited. Red shows 3 . 9 per cent of the visits, 
to 14.1 in the Alps. They are probably more important to 
flowers than the Syrphidae, since they are usually after nectar. 
Of the total fly visits 45 . 3 per cent are made by Muscoidea and 
30 . 8 by Syrphidae. 
Tahanidce, Scenopinidce, Pipunculidce, Leptidce, Phoridce . — 
Of 18 visits of 9 species to 13 flowers, 77 . 7 per cent are to Pol. 
72 . 2 to white and 72 . 2 to Umbelliferae. 
Nematocera. — Of 44 visits of 15 species to 24 flowers, 50 
per cent are to Pol, 56.8 to white, 43.1 to yellow and 50.0 to 
Umbelliferae. These flies are usually associated with more 
