16 



INSECTS OF SAMOA. 



third plate which extends entirely across the dorsum, and an apical transverse 

 plate. All these plates bear numerous small setae, and the posterior two exhibit 

 several long setae along their posterior margins. The apical plate extends on 

 to the ventral side, and almost to the genital opening. Occupying the median 



Text-fig. 4. — Ornitheza metallica {Schmer) ; a, clypeal region ; b, last three segments 

 of posterior tarsus ; c, wing. From same specimen as text-fig. 3. 



portion of the venter are a pair of large, oval plates, which bear but few setae. 

 The external genitalia are represented merely by two short flaps, beset with 

 nimierous setae. It is not possible to study the genitalia in the available material. 



It should be noted that another species of this genus, 0. andaiensis (Rondani), 

 possibly identical with 0. metallica, has been recorded from the South Pacific 

 region, and that species of Halcyon are included among its reputed hosts. 



Lynchia Weyenberg. 



The nomenclatorial vicissitudes of this genus need not be recited in detail 

 here, and it must suffice to say that it is to the present genus that the name 

 Olfersia has commonly been applied by recent authors. Aldrich, however, 

 pointed out that the true Olfersia really belongs to the group which has been 

 called Pseudolfersia, and he accordingly proposed the new name Omitho'ponus 

 for the present genus. Subsequently Bequaert showed that the type of the 



