and our latest was July 8, also in 1908. Fraterna is one of the oak- 

 hickory-persimmon species, especially characteristic of southern Illi- 

 nois, these three kinds of trees giving us 95 percent of our specimens. 

 Three and five tenths percent came from willows, and a very few from 

 poplars and black walnuts. 



Phyllopliaga profunda Blanchard 



Profunda is strictly confined to southern Illinois, all our 1336 

 specimens coming from that section except one from Hoopeston, in 

 Vermilion county. This species was especially abundant in the south 

 in 1910, when it made 11 percent of our collections there, being sur- 

 passed in numbers only by Mrticula, micans, and vehemens. It was 

 first taken that year on April 9, and for the last time July 21. All 

 but scattering specimens, however, came between May 2 and 26. It 

 is to a marked degree an oak-hickory species, 90 percent of our 1083 

 specimens coming from these two kinds of trees, and another 7 per- 

 cent from the persimmon. 



Pliyllophaga tristis Fabricius 



Tristis, nowhere very abundant in our collections, is one of the 

 May-beetles most closely limited to a single food-plant, being essen- 

 tially an oak species. Sixteen hundred and thirty-four specimens 

 were obtained in 130 collections from oak — an average of 9.6 to the 

 collection — only 131 specimens coming from other food-plants, of 

 which hickory was the most important. Nevertheless, it appears from 

 our data that if equal numbers of collections had been made from 

 hickory and oak, the specimens from hickory would have numbered 

 only 3.4 percent of those from oak. Notwithstanding this controlling 

 preference for oak leaves as food, only about 9 percent of the Phyl- 

 lophaga specimens obtained from oaks belonged to this species. 



Tristis was obtained thruout the state in collections ranging from 

 Cook to Union counties, numbering 523, 1037, and 324 in those from 

 northern, central, and southern Illinois respectively. 



It was curiously limited, however, in its local occurrence, all our 

 specimens from oaks coming from Aurora, Galesburg, Anna, and Car- 

 bondale, while large collections made in the same years from these 

 trees in McLean and Champaign counties and small collections from 

 Cook and Perry counties, did not give us a specimen of this species. 

 It was taken infrequently at lights, only 191 specimens of it occurring 

 among 29,752 May-beetles obtained by us from lights and light-traps ; 

 and these small miscellaneous collections were distributed like those 

 from their food-plants, except that 24 specimens came from Danville, 

 in Vermilion county, on the eastern border of the state. Evidently 

 the distribution of this species is restricted by ecological conditions 

 other than those connected with latitude and food. 



