134 Psyche [December 



larger, more strongly chitinized, light brownish plate with numer- 

 ous minute tubercles and terminating in two comparatively prom- 

 inent chitinous, acutely pointed spines or hooks which are curved 

 upward. 



Pupa. Length, 3 mm. Width, 1.1 mm. Whitish, somewhat 

 elongate, sides subparallel, anterior and posterior ends tapering 

 slightly. Dorsal surfaces of thorax and abdomen clothed with 

 minute fine hairs. Dorsal surface of prothorax bears several long, 

 fine hairs. A transverse row of long, fine hairs on dorsal surfaces 

 of meso and metathorax and each abdominal segment. Anterior 

 edge of prothorax bilobed. Dorsal surface of prothorax bears 

 numerous, uniformly minute, brownish tubercles, a few of which 

 bear long, fine hairs and the remainder, minute hairs. Last ab- 

 dominal segment bears a pair of dorsal, acutely pointed, brown- 

 tipped, diverging spines. Ventral surface and wing cases bearing 

 a few hairs. 



Polyporus versicolor appears to be a favorite food plant of mem- 

 bers of the Cioidcp, many species occurring by hundreds in a small 

 group of sporophores. It does not appear likely that the beetles 

 play anything except possibly an accidental part in the distribu- 

 tion of the spores which are normally wind borne. The beetles 

 frequent the interior of the fungus, appear to shun the light except 

 when in search of fresh food and remain in the sporophore until it 

 is almost all consumed. On account of the abundance of Poly- 

 porus versicolor, fresh food is usually within easy reach and requires 

 only a migration of several inches or less on the part of the beetles. 

 Examinations of the trunks of trees in various degrees of health and 

 which were close to stumps covered by Polyporus versicolor infested 

 by CioidoB failed to reveal the presence of any beetles belonging to 

 this family. 



