Early Stages of Coleoptera. ■ 333 



AntennjE four-jointed, inserted on a tubercle, first joint 

 short, the second a little over twice as long, the third a trifle 

 longer than the first, the fourth only about one-third as long 

 and tipped with three long bristles. 



Mandibles stout, curved, with a double median tooth, blunt 

 in the full-grown larva. 



Maxillae with a long basal joint equal to the first two joints 

 of the antennae. This joint is slightly curved, does not taper, 

 and is very densely spinose on the inner surface but with long 

 bristles on the other. The outer appendix is four-jointed, the 

 first joint stout, about half the length of the second and some- 

 what exceeded by the third, the fourth joint being ver}- small 

 and pointed at tip. The inner appendix is two-jointed, the 

 first joint stouter and a little longer than the second. 



The mentum is small, broader at. apex, extremely bristly. 

 The palpi are two-jointed, the first joint stouter and about 

 one-half longer than the second. 



The separate description of the segments cannot be taken 

 up as all form was of course destroyed by the process of cast- 

 ing the skin in transformation. 



Legs stout, the coxee conical and prominent, the femora a 

 trifle shorter, the suture of the trochanter distinctly marked. 

 The tibia is much shorter, not being equal to the tarsal joint 

 with claws. 



Pupa dirty white, 15 mm. in length, the head and jaws 

 very large. It is remarkable chiefly for the large bunches of 

 bristles which adorn the first five segments of the abdomen. 



Gyrinus picipes Aube. Plate IX, Fig. 6. 



Color of larva dirty white, with a shade of yellow and an 

 indistinct dorsal brown line. Eye-spots black, filaments clear 

 white. 



Form elongate, tapering to both ends, in section elliptical. 

 Length 10 mm. 



Head elongate, sides nearly straight. 



Prothorax wider than the head, narrowed and rounded in 

 front, with a distinct longitudinal slightly oblique impression. 



