10 [Transactions of the Society. 



We now come to a type, or rather a group of types, of nieta- 

 parameres that appears to be essentially different, being far 

 more complex than those so far mentioned. But a little consider- 

 ation will show how the external bulging so marked in C. morio, 

 P. fuscipennis, P. simulans, etc., by exaggeration may develop into 

 tlie three remarkable forms following. 



Proreus delicatulus Burr. (N. India.) 



The metaparameres are rather broad ; on the external margin 

 near the apex there is a strong emargination, which has the effect 

 of leaving a short, broad, triangular external lobe, and an inner, 

 narrow, recurved, acute internal lobe. 



The virga is not very long, and there appears to be only one 

 chitin-lobe to the virga (PI. II, fig. 11). 



Chelisoches ritsem/v Borm. 



Here the emargination of the metaparameres is carried still 

 further, and takes the form of a deep incision, forming two lobes. 

 The basal one is broad, narrowed at the apex to a blunt point ; the 

 inner lobe is longer, and much narrower, regularly tapering to an 

 acute point. Tiie virga is not much longer than the metaparameres, 

 and strengthened by a long narrow chitin-plate. The basal vesicle 

 is rather more developed than usual in this group, with the spiral 

 structure quite clear upon the basal portion of the virga ; it is 

 provided with one long chitin-lobe (PI. II, fig. 13). 



Hamaxas nigrorufus Burr. (New Guinea.) 



Here we have a very remarkable form of metaparamere. 

 Instead of two lobes being formed by an external incision, we have 

 the tendency to external dilation carried to an extreme, forming a 

 broad lateral lobe half as wide as the whole segment is long ; the 

 posterior margin is convex, the anterior concave, the tip acute ; 

 there are a few tufts of bristles on tlie posterior margin near the 

 tip, and on the anterior margin a few minute irregularities of out- 

 line that have the appearance of papillte. Anterior to these 

 lateral lobes, the margin is strongly concave, the segments 

 terminating in a strongly-narrowed acute point (PI. II, fig. 12). 



The virga is not much longer than the metaparameres ; the 

 basal vesicle is well developed, and spiral structure is seen in the 

 lower part of the virga. A striated chitin-plate, very broad and 

 ill-defined, departs from the upper side of the vesicle. 



In the structure of the virga, with the gradual development 

 of the basal vesicle from the scarcely dilated end of the virga in 



