384 ENTOMOLOGICAL NEWS. [Oct., 'l2 



Dr. Calvert exhibited a pair of Erpetogomphus from Costa 

 Rica representing a new species, which he proposed to call 

 E. tristani, in honor of their collector, Prof. J. F. Tristan. 

 They were of interest, not only because they confirmed the 

 existence of this genus so far south (only one specimen being 

 hitherto known from Costa Rica), but also because of the re- 

 markable modification of the head of the female, probably as 

 an adaptation in mating. The vertex has a deep longitudinal 

 groove into which the inferior appendage of the male can 

 fit, as must be the case if the male holds the female in copula- 

 tion as do other Gomphinae. The presence of this groove 

 alters the position of the median ocellus of the female in a 

 way unlike that of any other Odonate known to the speaker. 



HENRY SKINNER, Recording Secretary. 



ENTOMOLOGICAL SECTION, ACADEMY OF 

 NATURAL SCIENCES, PHILADELPHIA. 



Meeting of March 28th, 1912, Mr. Philip Laurent, Direc- 

 tor, presiding. Twelve persons were present. 



Mr. Rehn said the collection of Orthoptera had been in- 

 creased during the last month by over five hundred speci- 

 mens, from various sources. 



Dr. Skinner said a large number of specimens of Trogo- 

 derma stcrnale Jayne, had been collected from the mounted 

 mammal heads in the hall of the Academy, and he exhibited 

 both sexes. 



Dr. Calvert commented on the editorial in the March ENTO- 

 MOLOGICAL NEWS, on the subject of priority in nomenclature 

 and read letters relating to the same question, and gave the 

 text of an editorial for the April NEWS in relation to the dis- 

 cussion. 



Mr. Rehn said he was in favor of priority in nomenclature. 

 He spoke of his work on the Catalogue of North American 

 Mammals, wherein the law of priority was upheld. He 

 thought that the practicability of iiomina conservanda was 

 hopeless and considered that stability would only come from 

 upholding the law of priority. 



