THE NATURAL HISTORY SURVEY. 



1885. Illaenus daytonensis. Foerste, Bull. Sci. Lab. Den. Univ., 

 vol. 1, p. 104, pi. 14, figs. 4a-4b, 6, 7a-7c. 



Clinton: Near Dayton and at Fair Haven, Ohio. 

 1887. Illaenus daytonensis. Foerste, Bull. Sci. Lab. Den. Univ., 

 vol. 2, p. 93, pi. 8, figs. 6-7. 



Clinton: Ohio. 



1895. Illaenus daytonensis. Foerste, Geol. Surv. Ohio, vol. 7, 

 p. 525, pi. 26, figs. 4a-4b, 6, 7a-7c; pi. 27, figs. 6, lOa. 

 - Clinton: Ohio; Lockport, X. Y. 

 Illaenus graftonensis M. & W. 



1870. Illaenus (Bumastus} graftonensis. M. & W., Proc. Acad. 

 Xat. Sci.- Phil., for 1870, p. 54. 

 Niagara: Grafton, 111. 



1875. Illaenus (Bumastus) graftonensis. W. & M., Geol. Surv. 111., 

 vol. 7, p. 508, pi. 25, fig. 4. 



Niagara: Grafton, 111. 



1907. Illaenus graftonensis. Weller, This Bulletin, p. 223, pi. 16, 

 . figs. 4-6. 



Xiagaran: Joh'et, and near Lemont, 111. 

 Illaenus harrisi Weller. 



1907. Illaenus harrisi. Weller, This Bulletin, p. 218, pi. 16, figs. 1-3. 



Niagaran: Bridgeport; 111: 

 Illaenus imperator Hall. 



1861. Illaenus imperator. Hall, Rep. Prog. Geol. Surv. Wis., for 



1860, p. 49. 



Niagara: Racine, Wis. 



1862. Illaenus imperator. Hall. Geol. Surv. Wis., vol. 1, p. 433 



(no description). 



Niagara: \"isconsin. 



1865. Illaenus imperator. Hall, /Vdv. Sheets, 18th Rep. N. Y. St. 

 Cab. Nat. Hist., p. 28. 



Niagara: Racine and Waukesha, Wis. 



1867. Illaenus imperator. Hall, 20th Rep. N. Y. St. Cab. Nat. 

 Hist., p. 332, pi. 22, figs. 15-17; pi. 23, figs. 2-3. 



N iagara : Wisconsin . 



1870. Illaenus imperator. Hall, 20th Rep. N. Y. St. Cab. Nat. 

 Hist (rev. ed.), p. 420, pi. 22, figs. 15-17; pi. 23, figs. 2-3. 



Niagara: Wisconsin. 



1882. Illaenus imperator. Whitf., Geol. Wis., voL 4, p. 306, pi. 

 21, figs. 4-5. 



Niagara: Burlington, Wis. 



1907. Illaenus imperator. Weller, This Bulletin, p. 225, pi. 16, figs. 

 13-16. 



Niagaran: Joliet, 111. 

 Illaenus insignis Hall. 



1865. Illaenus insignis. Hall, Adv. Sheets, 18th Rep. N. Y. St. 

 Cab. Nat. Hist., p. 27, figs. 5-6. 



Niagara: Waukesha and Milwaukee, Wis.; Illinois. 

 . 1867. Illaenus insignis. Hall, 20th Rep. N. Y. St. Cab. Nat. 

 Hist., p. 331, figs. 5-6, pi. 22, figs. 13-14. 

 Niagara: Waukesha and Milwaukee, Wis. 



