April, I92I Bulletin of the Brooklyn Entomological Society 39 



alone in a one ounce salve box and fed grains of wheat. Noth- 

 ing unusual concerning the grub was noted at the time and no 

 special care was given it, and as far as the writer knows it re- 

 ceived no rougher treatment, which might cause a malformation, 

 than any of the others collected at the same time. Some of 

 these grubs have matured and others are alive at the time of 

 writing. 



The time at which the prepupal condition was assumed was 

 not noted. On August 25, 1920, pupation occurred and no 

 unusual condition of the prothorax was observed. Exactly one 

 month later (September 25) the beetle emerged from its pupal 

 " skin," which was shed normally. 



The tergum of the prothorax was found to be divided longi- 

 tudinally, as shown in Fig. i. Otherwise, the beetle had de- 

 veloped normally and was kept alive until the full adult colora- 

 tion was assured, when it was placed in a cyanide bottle and 

 killed. 



At the nearest points of the mesal margins of the divided 

 tergum, there is an intervening space of approximately one 

 millimeter. 



The mesal margins are not jagged but smooth and closely 

 resemble the caudal margins. For a short distance the margins 

 are nearly parallel, but soon diverge both caudad and cephalad 

 to form well-rounded edges. The caudal divergence leaves a 

 considerable portion of the mesothorax exposed, showing the 

 hirsute nature of this region lying immediately under the caudal 

 margin of a normal specimen. An examination of other speci- 

 mens shows the cephalic margin of the mesothorax to be straight 

 and at right angles to the longitudinal axis of the body. In this 

 form it appears sharply angulate with the apex of the angle 

 pointing cephalad. 



Between the parallel mesal margins and cephalad of the 

 mesothorax can be seen a considerable portion of the cervical 

 membrane. The margins of the anterior divergence are less 

 rounded than those of the posterior divergence, and where the 

 margins approach the head rather prominent angles are found. 

 The row of fine golden-colored hairs normally found on the 



