Male Genital Armature of tlie Derma'ptera. Part III. 11 



Chelisoches morio, to the well-defiued reniform vesicle of Hamaxas 

 nigrorufus, we have an approach to the Forficviline type. 



The usually well-defined, long and narrow, horny cliitinous 

 lobes attached to tlie vesicle are characteristic of the group, as 

 well as the tendency to lateral foliation and external emargination 

 of the metaparameres, culminating in the highly ornate forms seen 

 in Chelisoches ritsemiv. and Hamaxas nigrorufus. 



It is yet, however, premature to say whether the study of tlie 

 genitalia will modify the existing system of the family. 



Family FOKFICULID^. 



Zacher has shown that the Anechurinm, Forficidinie, and 

 Opistkocosmiin^ all have a very similar type of genital armature. 

 Characteristic of the group are the almost invariably elongate, 

 apically rounded metaparameres, well-developed reniform basal 

 vesicle of the virga, sometimes with chitinous appendages, and nearly 

 straight or gently sinuous virga of varying length. Useful charac- 

 ters are afforded by the manner in which the virga is connected 

 with the vesicle. Sometimes it enters with no appreciable angle, 

 sometimes it is strongly elbowed. The vesicle itself is almost 

 truly reniform, and its appendages offer some diversity of form. 



In the Anechuri7ise, the virga appears to be always elbowed at 

 the junction with the vesicle. This is well seen in Zacher' s 

 figures of Burriola euxina Sem., Burriola reiseri Wern., Meso- 

 chelidura bolivari Dubr , and Chelidura acanthopygia G-ene. It 

 is also very noticeable in the accompanying figures of Anechura 

 hi'pu7ictata Fabr,, and Allodahlia scahriuscula Serv. 



As a rule, the metaparameres are rather narrow, as in Zacher's 

 figures of Mesoehelidura bolivari, Anechura bipunctata, and Burriola 

 euxina, where they are nearly parallel-sided, and apically rounded. 

 In Allodahlia scabriuscula they are, however, decidedly roundly 

 convex externally, broad, and broadly rounded at the tips (PI. II, 

 fig. 16), This species also shows an appendage to the vesicle 

 and a narrow chitin-plate in the prseputial sac. A somewhat 

 similar appendage to the vesicle is seen in Zacher's figures of other 

 AnechuriniB, except A. bipunctata, but my figure shows a rather 

 feebly-developed and indistinct appendage. No chitin-plates are 

 recorded in the prseputial sac, except in Allodahlia scabriuscula. 



Subfamily Anechurinm. 



My inclination to unite the Chelidurinae with the AnechuriiicV 

 is justified by the genitalia. After all, the reduction of the elytra 



