OF WASHINGTON, VOLUME XIII, 1911. 87 



and their faint lispings do not readily indicate their position 

 amidst the grass stems. These little insects may easily be ob- 

 served and their song-habits carefully noted if they are con- 

 fined in suitable boxes. 



Under the heading Notes and Exhibition of Specimens, Mr. 

 Hunter mentioned the report of Dr. Darling relative to the 

 humming of mosquitoes. Mr. Knab said that Landois has 

 reported the sound as produced by the thoracic spiracles. 



Mr. Rohwer exhibited a gynandomorphic wasp. 



Dr. Dyar spoke of the troublesome genus Diatr&a and an- 

 nounced his success in separating as two distinct species the 

 forms feeding on corn and on sugar cane in the United States 

 in characters of both the larvae and the adults. 



Mr. Webster said that both the spotted and the immaculate 

 forms of larvae occur in corn. 



Mr. Kelly spoke of the known life history of an often 

 troublesome chrysome'id beetle (Myochrous denticollis} of 

 corn. The larvae found in the ground feeding on the roots 

 of cocklebur were exhibited. Discussed by Messrs. Webster 

 and Knab. 



Mr. W. D. Hunter exhibited a catalogue of the Coleoptera 

 of Mexico which appears to have been overlooked by the 

 compilers of the Zoological Record and other bibliographies. 

 It is not referred to in connection with the treatment of the 

 Coleoptera in the Biologia Centrali Americana. The full 

 title of the paper is as follows: 



Cat.ilogo | de la | Coleccidn de Coledpteros Mexicanos | Del Museo 

 Nacional, | formacla y clasificada | por el Dr. D. Eugenio Dugtfs. | 

 (Salon de Entomologfa.) | Segunda Edicion. | Mexico | Imprenta del 

 Museo Nacional. | 1901. | 



The catalogue contains 148 pages and 12 colored plates of 

 good execution. These plates cover 101 species. In five 

 cases species are figured which do not appear in the list. 



The catalogue contains a hundred or more manuscript 

 names of Dr. Duges. These are, in the most part, noniina 

 ntntd, but five of the species bearing Duges's name, are illus- 

 trated in the plates and can probably be recognized. The 

 work has a considerable number of incidental notes regarding 



