| PHILADELPHIA — Zoological Society 
| Annual Report of the Board of Directors, 1920. 
Ip. — Academy of Natural Sciences È 
Proceedings Vol. LKX, p. i; Vol. LXXI, p. 1, 1 e m. 
St. Lours — Missouri Botanical Garden. 
Bulletin. Vol. VII, n. 5-10; Vol. VII, n. 1-10. 
WasHINGTON — U.S. Department of Agriculture 
Yearbook. 1918, 1919. 
Bulletin n. 794. 
Ip. — Smithsonian Institution 
Annual Report, 1917, 1920. 
— U.S. National Museum 
Rie ingo Vol. 54, 55. 
Bulletin, 99, 100, p. 3, 4; 5, 7; 103, 107, 108, 110, ti 
Vol. 21; Vol. 22, p. 1-8; Vol. 23, p. 1. 
URBANA — Illinois University 
Biological Monographs. Vol. IV, n. 1-2-3-4; Vol. V, n. 1. 
— SVEZIA 
SrockHoLm — Entomologiska Fòoreningen 
Entomologisk Tidskrift. Arg. 40, N. 1-2, 4. 
UPPSALA — Kungl. Universitet ° 
Bulletin of the Geological Institution. Vol. XVI. 
SVIZZERA 
BAsEL — Naturforschende Gesellschaft 
Verhandlungen Band XXIX e XXX. 
BERNA — Nat. Ges. 
Mitteilungen 1916, 1917, 1918. 
LAUSANNE — Sociét6 Vaudoise de Sciences Naturelles 
Bulletin. N. 196-198, Centenaire. 
Lucano — Società Ticinese di Sc. Nat. 
Bollettino, XI- XIV anno. 
NEUCHATrEL — Soc. Neu. de Sc. Nat. 
Bulletin, t. XLIII (1917-18). 
ZuRrIico — Naturf. Gesell. 
Vierteljahrsschrift, H. 3 e 4 (1918) e 1-2 (1919). 
