142 
William Morton Wheeler 
Addendum. 
While the preceding pages were passing through the press, Mr. William A. Haren, 
of St. Louis, Mo., has sent me for study a small collection of amber inclusions containing 
the following ants: 
Monomorium pilipes Mayr, one worker; 
Iridomyrmex goepperti (Mayr), six workers and one female; 
Iridomyrmex samlandicus Wheeler, one worker; 
Asymphylomyrm ex balticus Wheeler, seven workers; 
Rhopalomyrmex pygmaeus Mayr, one worker; 
Gesomyrmex hoernesi Mayr, one worker; 
Prenolepis henschei Mayr, six workers, one larva and three male pupae ; 
Lasius schieff erdeckeri Mayr, one worker; 
Lasius pusillus Mayr, three workers; 
Formica flori Mayr, four workers; 
Camponotus mengei Mayr, one worker. 
The three male pupae of Prenolepis henschei in this collection are nude, 
i. e. not enclosed in cocoons, a fact of considerable interest as showing that as far back 
as the early Tertiary the larvae of this genus of Camponotince had lost the cocoon- 
spinning instinct which is still so rigidly preserved by most of the genera of the subfamily. 
