174 AUSTIN AND GRIMES: BEAT RECEPTION 



of the description all apply to Ceropales (as now understood) 

 and not to Gorytes, and because it is certain that Latreille in- 

 tended the name for the groups of Psammocharid wasps it does 

 not seem desirable or justifiable to go against the rules and 

 opinions governing zoological nomenclature and change the 

 interpretation of a name which has had standing for more than 

 two generations. The following synonymy seems to the author 

 to be correct: 



Ceropales Latreille, 1796. Type. — Evania maculata Fabricius. 



Agenioxenus Ashmead, 1902. Type. — {Ceropales rufiventris 

 Walsh) Ceropales robertsoni Cresson. 



Ceratopales Schulz, 1906 (an emendation which is accepted by 

 Banks, Bui. Mus. Comp. Zool., 63: 18 19, p. 248). 



Hypsiceraeus Morice and Durrant, 1915. Type. — Evania 

 maculata Fabricius. 



Because of the controversy between Viereck and Ashmead 

 (see Knt. N., 13: p. 275 and p. 318, 1902) concerning the 

 generic name Agenoxenus a few words of explanation are neces- 

 sary. In proposing the generic name Agenioxenus Ashmead 

 definitely cited as the type Ceropales rufiventris Walsh. This 

 species has been correctly synonymized with Ceropales robertsoni 

 Cresson by Fox (Trans. Amer. Ent. See, 19: p. 57, 1892) 

 and is a true Ceropales. The genus Agenioxenus is, therefore, a 

 synonym of Ceropales. It so happens, however, that the prob- 

 able specimen on which Ashmead founded his genus is a male of 

 the variable Batazonus interruptus (Say.). Ashmead's state- 

 ment that the specimen he had was probably a cotype of C. 

 rufiventris is undoubtedly wrong as the specimen will not agree 

 with the original description and bears only a name label in 

 Ashmead's hand writing and the printed label "Through C. V. 

 Riley." This case is covered by opinion 65. 



RADIOTELEGRAPHY.-A/'o/^5 on beat reception. L. W. Aus- 

 tin and W. F. Grimes, U. S. Naval Radio Research Labora- 

 tory. 



Effect of Regeneration.— According to some authorities, the 

 great sensitiveness of the oscillating tube is mostly due to its 



