54 



Tachinid fly Cisfogaster immaciilata 55 



Pennsylvania Bumblebee Bomhus pennsylvanicus 50, 52, 55, 176 



False Bumblebee PsitJiyrns variabilis 176 



Eucerid bee Mclissodcs himacnlata 48 



Nomadid bee EpcoUis concolor 48, 52 



Halictid bee Halictus ohscnnis 55 



Halictid bee Halictus fasciatus 48, 52 



Black Digger-wasp Clilorion atratum 55 



Pennsylvania Digger-wasp Chlorion pennsylvanicum 55 



Alyzinid wasp My due sexcincta 52, 55 



Ant Formica pallid c-fidva schaufussi 



incerta 52 



The general conditions of this prairie appear to have been less dis- 

 turbed than at Station I ; at least the prairie vegetation is more exten- 

 sive and uniform. The change in the vegetation is i^pparently greater 

 than the change in the kinds of animals. Their feeding and breeding 

 relations appear to be much like those at the prairie stations previously 

 discussed. 



In the flowers of the cup-leaved rosin-weed (Silphimn integri- 

 foliuui) was found a giant bee-fly (Bxoprosopa fasciafa) which had 

 been captured by the ambush spider (Misiimcna alcatoria) , and on 

 webs in colonies of this same plant the garden spider (Argiope aiiran- 

 tia) was observed, with a grasshopper (Melanoplus diffcrentialis) en- 

 tangled in the web. From the flowers of this SUpJiiuui the following 

 insects were taken : Epicauta marginata and B. pcnnsylvanica, Rhyn- 

 chitcs (uncus, Phyniata fasciafa, Encoptolopluis sordidus, Melanoplus 

 diffcrentialis (nymph), Xiphidiuni strictuni (adult and nymph), A'. 

 attcnuatuni, Mclissodcs hiniaculata and obliqua, Bpcolus concolor, and 

 Halictus fasciatus. The margined blister-beetle (Bpicauta marginata) 

 was found both upon the flowers and the leaves of the plant. On the 

 flowers of the purple prairie clover {Petalosteniuni purpurewni), Bom 

 bus pcnnsyh'anicus, Xiphidium strictum, and Buscliistus variolarius 

 were taken. Collection 176 was taken from the flowers of Liatris 

 scariosa, and Nos. 55 and 178 from the flowers of Bryngium yiicci- 

 folium. 



Swarms of the small corn syrphid, Mesogramma politum, were 

 present, on one day settling by dozens on my hands and clothes, where 

 they were easily grasped by the wing. It had been a warm day, and 

 this swarming was in the sunshine at about 4 :30 p. m. The flies came 

 from a large corn field a few feet away. 



