142 William Morton Wheeler 



Addendnm. 



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; 



Iridomyrraex samlandicus Wheeler, one worker; 



Asymphylomyrmex balticus Wheeler, seven workers; 



Ehopalomyrmex pygmseus Mayr, one worker; 



Gesomyrmex hoernesi Mayr. one worker; 



Prenolepis henschei Mayr, six workers, one larva and three male pupse ; 



Lasius schiefferdeckeri Mayr, one worker; 



Lasius pusillus Mayr, three woriiers; 



Formica flori Mayr, four workers; 



Camponotus mengei Mayr, one worker. 



The three male pupse of Prenolepia 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. 



