Vol. XXviii] ENTOMOLOGICAL NEWS. 293 



In conclusion, while the penis in certain groups of Zygop- 

 tera has little value as a generic character, and in other groups 

 has little value as a specific character, in this particular group 

 of the Legion Protoneura it is of considerable assistance in 

 defining both genera and species. As was stated at the be- 

 ginning of this article, only a monographic study of the penis 

 throughout the entire sub-order of Zygoptera can show what 

 value to place on the penis in any group as a systematic help. 

 In all the work this character appears to be suggestive rather 

 than positive and final. 



Explanation of Plates XXI-XXIII. 



Drawings of penes in the Legion Protoneura, being lateral and ven- 

 tral views of the last two segments. 



Figs. 1-2, Palacmnema pauUna Drury, genotype. El Fiscal, Guat, 

 June 6, 1909, in coll. Williamson. 



Figs. 3-4, Palaemnema angclina Selys; Atoyac, Vera Cruz, Mex. 

 May, H. H. S., in coll. Calvert. 



Figs. 5-6, Platysticta maculata Selys, genotype; Ceylon, in coll. 

 Hagen, M. C. Z. 



Figs. 7-8, Platysticta tropica Selys; Ceylon, in coll. Hagen, M. C. Z. 



Figs. 9-10, Disparoneura glauca Burm., genotype; Cap[e] in coll. 

 Hagen, M. C. Z. 



Figs. 11-12, Disparoneura westermanni Selys; Nilgiris, in M. C. Z. 



Figs. 13-14, Caconeura dorsalls Selys, genotype; Lohabu, N. Borneo, 

 in coll. Williamson. 



Figs. 15-16, Caconeura insignis Selys; Java, Tilg., in coll. Williamson. 



Fig. 17, Nososticta solida Selys, genotype; Queensland, in coll. Wil- 

 liamson. 



Figs. 18-19, Isosticta simplex Martin; Sydney, N. S. W., coll. by 

 Tillyard, in coll. Kahl. 



Figs. 20-21, Neosticta canoscens Tillyd., genotype. Tabalam, N. S. 

 W., cotype, in coll. Kahl. 



Figs. 22-23, Idioneura ancilla Selys, genotype; Brazil, Winthem, in 

 coll. Hagen, M. C. Z. 



Figs. 24-25, Microneura caligata Selys, genotype; Cuba, 1864, in coll. 

 Hagen, M. C. Z. 



Fig. 26, Protoneura capillaris Ramb., genotype; Portland, Jamaica, in 

 coll. Calvert. 



Figs. 27-28, Protoneura calvcrti Williamson; Tumatumari, Brit. Gui- 

 ana, in coll. Calvert. 



Fig. 29, Epipleoncura lamina Williamson, genotype; Wismar, Brit. 

 Guiana, in coll. Williamson. 



