FOR SALE 
The Ants of North America, by Professor Wm. S. 
Creighton. Published in April, 1950, as volume 104 of the 
Bulletin of the Museum of Comparative Zoology, with 585 
pages and 57 plates. Price $10.00 (postpaid). Send orders 
to Museum of Comparative Zoology, Harvard College, 
Cambridge, Mass. 
BLACK STEEL INSECT PINS 
Trade Mark “Elephant", the ideal black insect pin. Trade 
Mark “IMPERIAL", formerly Czechoslovakia. Both types in 
sizes No. 000-7. Also Minuten Nadeln. Request samples 
and prices from the manufacturer: Emil Arlt, Spezial- 
NADELFABRIK, SALZBURG, 2, P.O. BOX 76, AUSTRIA. 
