1921] Boving: Larvae and Pupae of Social Beetles 211 



as hypopleurum of eighth abdominal segment, with one small 

 seta and some very minute scattered over whole surface. Tenth 

 abdominal segment as long as one of the well developed abdomi- 

 nal segments, conical, one and one-half times as long as wide ; a 

 ring of small setae right above the truncate end ; also with very 

 minute setae scattered over whole surface. Mesothoracic 

 spiracle about as large as base of claw, situated on top of small 

 softskinned conical tube ; abdominal spiracles half as large and 

 not on tubes. 



Neivly hatched larva: 



Length 1 mm. Width of prothorax 0.25 mm. Length of 

 head and thorax together about as long as abdomen. One very 

 long seta on each side of hind margin of tergum; setae corre- 

 sponding to the small setae along hindmargin comparatively 

 longer than those of mature larva; no setae corresponding to 

 minute setae on the whole tergal surface. 



Eunausibius wheeleri Schwarz and Barber. 



(Described from specimens preserved in U. S. National 



Museum.) 



Mature Larva: 



Length, about 3.5 mm. Width of prothorax, about 0.75 

 mm. Length of head and thorax combined, in proportion to 

 length of abdomen, about as 3:5. Shields thinly chitinized, light 

 grey, shiny. Both thoracic and abdominal segments along hind- 

 margin with a series of six to seven setae on each side; two 

 sets very long, the others short; rest of tergal shield smooth 

 with a few very minute setae. Abdominal hypopleurum with 

 one long and one short seta. Otherwise like Coccidotrophus 

 socialis, to which larva it is very closely related. 



C 3. — General and specific description of the Pupae of 



Coccidotrophus socialis and Eunausibius wheeleri. 



(Plate IX, figs. 19-21, 23) 



General Description. 

 Body somewhat depressed ; about five times as long as width 

 of prothorax. Head large and wide ; not to be seen from above ; 



