528 Transactions of the Society. 



In the males of some species, the sides of some of the abdominal 

 segments, usually the seventh, eighth and ninth, but sometimes the 

 sixth, and even the fifth, show a characteristic sculpture ; these are 

 often produced into an acute point, and more or less corrugated and 

 rugulose, sometimes with a sharp and well-marked keel running 

 down into the point. The point of the ninth segment usually 

 corresponds with a lateral keel or crest on the tenth tergite, and 

 then with the external keel or ridge of the forceps. 



Sides of the 5th, 6th, 7th, 8th, and 9th Abdominal Segments of 



the Male. 

 Acute — 



Westralica Burr. Isomorpha Bor. 



Festse Bor. Incisa Bor. 



Tellinii Bor. Silvestrii Bor. 



Mauritanica Luc. Addita Burr. 



Lmta Gerst. Saramaccensis Zacher. 



Compressa Bor. Sumatrana Borm. 



Annulipes Luc. Marginalis Dohrn. 



Maxima Brulle. Brunneri Dohrn. 



Maritima Bon. Pacifica Erichs. 



Littorea White. Owenii Burr. 



Dubronii Kirby. Vicina Burr. 



Infelix Burr. JEthiopica Burr. 



Verhcejji Zacher. Kristenseni Burr. 



Horvathi Burr. Hottentotta Dohrn. 



Pervicina Burr. Braueri Zacher. 



Tumida Bor. Felix Burr. 



Angulifera Dohrn. Woodwardi Burr. 



Sides of the Abdomen of the Male not Acute. 



PerJcinsi Burr. Pagana Burr. 



Xenia Kirby. Silvestrii Bor. 



Occidentalis Kirby. Infelix Burr. 

 Marginalis Dohrn. Vosseleri Burr. 



Kudagse Burr. Gestri Bor. 



Turgida Burr. Atra Bor. 



Quserens Burr. Picea Bor. 



The Psalidie can thus be divided into two groups of very unequal 

 proportions. The first, the Titanolabides, contains those genera in 

 which the sternal plates are lobed posteriorly ; these are four in 

 number, occurring partly in the Oriental, but mainly in the 

 Australian regions. 



The remaining division contains all the other Psalidse, and 

 these, unfortunately, cannot be divided conveniently by any ex- 

 ternal feature, nor by any geographical feature. We have to 



