JOUENAL 



OF THE 



ROYAL MICROSCOPICAL SOCIETY. 



DECEMBER, 1915. 



TRANSACTIONS OF THE SOCIETY. 



VIII. — On the Male Genital Armature of the Dermaptera. 



Part II. : Psalidai. 



By Malcolm Burr, M.A. D.Sc. F.L.S. F.E.S. 



Communicated by John Hopkinson, V.-P. R.M.S. (Read May 19, 1915.) 

 Plates X to XII and Figs. 58 to 64. 



PSALID.E. 



As Zacher remarks, the classification of this group is one of the 

 most difficult of the taxonomic problems offered by the Dermaptera. 

 The best solution tendered yet is that of Zacher, based almost 

 exclusively on the genital armature of the male ; these certainly 

 offer extremely valuable specific and generic characters, but he did 

 not have sufficient material at his disposal to enable him to judge 

 the relative value of the different features. He observes that very 

 useful characters are afforded by the form of the pronotum, and of 

 the antennae, both of which are of generic value, of the structure of 

 the end of the abdomen in the male, which offers both generic and 

 specific characters ; and he suggests two more which have not yet 

 been properly examined in this group — namely, the size of the eyes 

 and their distance from the posterior margin of the head-capsule, 



EXPLANATION OP PLATE X. 



FIG. FIG. 



1. Homceolabis maindroni Bor. 6. Psalis gagatina Klug. (= Carcino- 



2. Titanolabis colossea Dohrn. 



3. Labidurodes robustus Dubr 



4. Mandex peruviana Borm. 



5. Psalis americana Beauv. 



phora robusta Scudd). 



7. Logicolabis vosseleri Zacher. 



8. Anisolabis pagana Burr. 



9. A. littorea White. 

 10. A. verhoeffii Zacher. 



Dec. 15th, 1915 2 o 



