BY REV. T. BLACKBURN. 663 



K. Form widely oval. Head flat and 



wide nigritula, Clk. 



KK. Form narrowly oval. Head 

 comparatively narrow and 



convex ffiuone, Blackb. 



II. Elytra together fully as wide as 



long. Form'nearly circular Irene, Blackb. 



P. VARIABILIS, Chp. 



This species has ah-eady been discussed as a member of the 1st 

 Subgroup. It is here mentioned again on account of its present- 

 ing the characters which distinguish the 1st from the 4th Sub- 

 group so feebly and uncertainly that it seems to be a connecting 

 link between those subgroups. 



P. SUBCOSTATA, Chp. 



Another species partaking somewhat of the characters of Sub- 

 group i. inasmuch as it is of large size and with more or less 

 indications of prothoracic foveae, but as these are combined with 

 an elytral suture completely of the type of Subgroup iv., I think 

 it may conveniently stand at the beginning of that aggregate, 

 particularly as it would be an entirely isolated species in general 

 appearance if it were placed among the species of the former 

 subgroup, and is less so, I think, in the position I now give it, 

 I have not before me an example named by Dr. Chapuis, but I feel 

 no doubt of the correctness of my identification, although the 

 specimen described by Chapuis was a rare variety of which I 

 have seen only one specimen in a long series that I have examined. 

 It is a large species (long. 4^-6 lines) of depressed and somewhat 

 narrow form (the males less narrow than the females), the head 

 and prothorax closely somewhat strongly and subrugulosely punc- 

 tulate, the latter with more or less distinct sublateral fove?e behind 

 which there is a tendency to gibbosity (occasionally as in the 

 type well defined), the foveolate and gibbous portions are in some 

 examples {e.g., the type) darker than the adjacent surface. The 

 el3'tra are strongly punctulate-striate with evidently convex inter- 

 stices (this sculpture notably stronger than in any of the species 



