1917.] NATURAL SCIENCES OF PHILADELPHIA. 205 



June 12, 

 Adjourned Meeting. 

 The President, Samuel G. Dixon, M.D., LL.D., Sc.D., in the Chair. 



Eighteen members present. 



The reception of papers under the following titles was reported 

 by the Publication Committee : 



"New species of North American bees of the genus Andrena, " 

 by Henry L. Viereck (May 23). Referred to the American Ento- 

 mological Society, (Entomological Section of the Academy.) 



"A new humming bird from the Santa Marta region of Colombia, " 

 by Witmer Stone (May 25). 



"Marine mollusks of Hawaii, I-III," by Henry A. Pilsbry (May 

 26, June 11). 



" Dermapterological notes" by Morgan Hebard (June 25). 



The deaths of the following members were announced : 



Robert J. Hess, M.D., June 20, 1909. 

 Henrv A. Green, 1913. 

 Eugene I. Santee, M.D., June 16, 1915. 

 Frederick Gutekunst, April, 27, 1917. 

 William H. Newbold, May 25, 1917. 



On Hagenius hrevistylus. — Dr. Philip P. Calvert exhibited two 

 larval exuvise of the large dragon fly, Hagenius hrevistylus, from 

 Darby Creek above Heyville, June 18, 1916, and a female imago of 

 the same species from Crum Creek, near Castle Rock, June 23, 1916, 

 both localities in Pennsylvania within nine miles from Philadelphia. 

 He remarked that only one previous record (a larva, Fairmount Park, 

 1893, by the late C. Few Seiss, of this Academy) of this species within 

 the Philadelphia area existed and called the attention of those present 

 to the desirability of noting additional specimens in the present month. 

 The peculiar shape of the larva was commented on. 



Beltian Bodies on Acacia. — Dr. Calvert also exhibited specimens 

 of a Bull's Horn Thqrn {Acacia costaricensis Schenck) from Costa 

 Rica, showing the paired thorns and the "Beltian bodies" at the tips 

 of the pinnules, and specimens of ants {Pseudomyrma nigrocincta) 

 from one of these thorns, all collected by himself. He stated the 



