213 



the mouth-parts of a larva of Pterostichus, belonging to the 

 Carabidie, a family closely allied, as is well known, to the 

 Dyticidie, but in whose larvae the jaws are adapted for biting 

 and not for sucking. Here (see fig. 6) the hypopharynx (H) 

 is not fused 

 dis tall y with 

 the labium (La), 

 which projects 

 far beyond it. 

 The position of 

 the h y p o - 

 pharynx is dis- 

 tinctly dorsal 

 to that of the 

 base of the 

 maxilla (Ma) ; 

 between the two 

 structures there 

 is on each side 

 a rounded lobe 

 beset with 

 long, flexible 

 hairs (Mx). set 

 somewhat ob- 

 liquely, and 

 evidently corre- 

 sponding to the 

 process wliich, 

 in I ly bi us , 

 M A N G A X has 

 identified as the 

 maxillula. Its 



Fig. 6. — Dorsal view of half hypopharynx (H) and 

 labium (La) of Pterostichus larva, with base of left 

 ma.xilla (Ma) and ma.\illula (Mx). Magnified 75 

 diainctors. 



clear association with llie hypopharynx in Pterostichus strongly 

 supports such an idrntification, and we may hopefully an- 

 ticipate that students of insect anatomy will lind these interesting 

 appendages in beetle larvie of other families. 



