1912.] NATURAL SCIENCES OF PHILADELPHIA. 157 



FIXATION OF THE SINGLE TYPE fLECTOTYPIC) SPECIMENS OF SPECIES OF 



AMERICAN ORTHOPTERA. 



DIVISION II. 

 BY A. N. CAUDELL and MORGAN HEBARD. 



The Species of North American Orthoptera Described by 



Andrew Nelson Caudell. 



The desirability of selection and fixation of a single type was 

 pointed out by the last International Entomological Congress, and 

 the first paper on this subject with reference to the North American 

 species of Orthoptera by Mr. James A. G. Rehn and the junior 

 author of the present paper has recently appeared in the Proceed- 

 ings of the Academy of Natural Sciences, 1912, pp. 60-128. 

 In the preface to that paper the subject is discussed and method of 

 selection of lectotypic specimens as followed in that contribution 

 explained. In the present paper the work is made easy, owing to the 

 fact that the author of all the species treated has selected from the 

 typical series that specimen for single type which he would have 

 selected at the time the species was described, had such action at 

 that time been customary. The type numbers of the United States 

 National Museum for Orthoptera are not available in fixing single 

 types, though they are given in the original descriptions of all new 

 species recently described or named from material belonging to that 

 institution. This is due to the fact that in the Orthoptera Collec- 

 tion these type numbers do not refer to a single type, or to the male 

 and female types of a species, but usually to the entire typical series. 

 Of the seventy-five species described by the senior author which are 

 found in North America, we find sixty-two single types in the United 

 States National Museum, seven in the Museum of the Brooklyn 

 Institute of Arts and Sciences, two in the Scudder Collection, and 

 one each in the American Museum of Natural History of New York, 

 the Saussure Collection, and the Morse Collection, while of one 

 species the typical series is lost. At the present day all of these 

 single types ?.re extant, with the exception of the one mentioned as 

 lost; those of the United States National Museum are in Riker 

 Mounts. The nomenclature given is that of the original description, 



