1921] Boving: Larvae and Pupae of Social Beetles 209 



C. 2. — Specific Description of Larvae of Coccidotrophics socialis 

 and Eunausibius wheeleri. 



Coccidotrophus socialis Schwarz and Barber 



(Described from specimens preserved in U. S. National 

 Museum.) 



(Plate VII, figs. 1 and 2.) 



Mature Larva: 



Length about 4 mm. Width of prothorax about 1 mm. 

 Whitish, very thinly chitinized. Head with width to length as 

 1:11^. Length of head and thorax, together in proportion to 

 abdomen as 3 :5. Ocelli four in a lower, square group, two in 

 an upper group. Frons with short setae sparsely scattered 

 over the surface; the paired spots at frontal sutures yellow. 

 Clypeal region anteriorly with transverse series of four long 

 setae, laterally with one long seta on each side, several short setae 

 scattered over entire surface. Labrum, with several very short 

 setae. Another part of epipharynx with four long setae along 

 the front margin and one long seta on each side near the attach- 

 ment of the epipharyngeal tendon ; posterior part of epipharynx 

 without setae. Hypostoma about half as long as lateral outline 

 of epicranium. Epicranial postmaxillary margin about half as 

 long as cardo. Epicranium, with a few long and some short 

 setae scattered over the surface. Antenna about half as long 

 as head from front margin or labrum to occipital foramen; 

 basal antennal joint about half as long as second joint (soft- 

 skinned apical part excluded), subcylindrical, twice as long ai 

 wide; second antennal joint clubshaped, with end twice as wide 

 as base, almost one-third as long as length of head; tip of 

 antenna membranous, whitish, low, rounded, not distinctly set 

 off from second joint; no supplementary appendix; a ring of 

 densely set spinules present on distal end of basal joint, numer- 

 ous thin and medium long or short setae irregularly scattered 

 over the whole surface of second joint. Mandible with apical 

 part trifid, several setae of different sizes on exterior lateral 

 mandibular region. Each maxillular area ovate, membranous ; 

 individual setae belonging to series along inner margin of 

 medium size, somewhat curved, bending outward. Maxilla, with 

 end of cardo articulating at a distance from occipital foramen, 



