1914] Bromley—Asilids and their Prey 193 
carry off a male Erax estuans, and have also seen hornets kill small 
Asilids. Spiders are, however, formidable enemies of robber-flies 
I have taken three Proctocanthus philadelphicus from webs of 
spiders; one from an Epeirid web and two from a web of Agalena; 
six Deromyia umbrina from Argiope riparia, Dasyllis thoracica from 
Theridium tepidarorium, and many small Asilids and Erax estuans 
from Theridium, Epiera and Linyphia. 
I am greatly indebted to Mr. C. W. Johnson of the Boston 
Society of Natural History for many suggestions and kind assist- 
ance in naming the insects included in the following lists. 
List or Insects aND NUMBER OF SPECIMENS TAKEN FROM ASILIDS. 
Asilus sericeus Say. 
(Lepidoptera) 
1 Euvanessa antiopa 1 Archytas analis 
1 Satyrus alope 1 Eudamus tityrus 
2 Colias philodice 1 Noctua sp. 
2 Chrysophanus hypophleus 
(Diptera) 
Asilus lecythus Walker. 
(Odonata) 
1 Enallagma sp? 
Asilus orphne Walker. 
(Hemiptera) 
1 Typhlocyba sp? 
Asilus notatus Wiedemann. 
(Diptera) 
2 Metopia leucocephala 2 Sarcophaga sp? 
(Neuroptera) 
1 Chrysopa sp? 
Asilus erythrocnemius Hine. 
(Hymenoptera) 
1 Formica sp? 2 
Asilus latipennis Hine<’. 
(Diptera) 
1 Asilus latipennis 3 
