June. 191 1.] Proceedings of the Society. 131 



On motion of Mr. Groth a vote of thanks was tendered to Professor 

 Smith for his interesting lecture. 

 Society adjourned. 



Meeting of Tuesday, April 19, 1910. 



Held at the American Museum of Natural History at 8:15 p. m. President 



C. \V. Leng in the chair with seventeen members and three visitors present. 



Dr. Osburn reported the receipt of a number of photographs to add to 

 the collection of entomologists and stated that the curator had provided a 

 suitable place for storing and exhibiting future additions in this line. 



Mr. Dow. of the Field Committee, reported that short collecting trips would 

 be taken on Saturday afternoons and Sundays ; and requested that those who 

 desired to take these trips should keep in touch with the committee. The 

 librarian, Mr. Schaeffer. asked for permission to buy four volumes, unbound, 

 of the Deutsche Entomologische Zeitung to exchange with Mr. Angell for four 

 bound volumes of the same publication. 



Mr. Grossbeck read a paper on the subject of " Observations on the 

 Behavior of the Digger Bee, Emphor bombiformis Cresson." Mr. Grossbeck 

 stated that observations were made on a colony of these bees discovered at the 

 edge of a cat-tail swamp near Arlington, N. J.. August 26, 1909. The bees 

 were busily engaged in digging burrows in the hard, shaly soil and provision- 

 ing them with masses of soft yellow pollen. Over an area three feet in 

 diameter, one main colony of 70 bees had made 127 holes. Three other smaller 

 colonies in the neighborhood were observed. He described their method of 

 burrow-making as well as the burrows, their carrying and storing of pollen 

 of the swamp rose mallow and the egg laying on the pollen balls. Specimens 

 of the bees, plaster casts of their burrows and balls of pollen were exhibited. 



Mr. Engelhardt mentioned finding a small burrowing bee at Ft. Lee, 

 N. J., and in Utah, and Mr. Hallinan spoke of noticing similar bees in 

 Panama. 



Mr. Schaeffer exhibited a collection of Mycetophagus and made some 

 remarks concerning their structural characteristics and their fungus-feeding 

 habits. 



Mr. Shoemaker exhibited some varieties of Papilio philenor which he had 

 bred last summer, one showing abnormally shorter tails and another with 

 more evidence of white markings on the wings. 



Mr. Lutz exhibited and explained a cyanogen gas tank which he had 

 constructed for killing insect pests in the insect collection. 



Mr. Engelhardt exhibited some South American and West Indian butter- 

 Mies and called attention to the close resemblance between Danais erippus and 



D. plexippus and spoke concerning protective mimicry among the butterflies. 



Mr. Davis exhibited Professor Wheeler's new book on "" Ants," 

 Society adjourned. 



