PAEDERIDAE. 277 



Labruiu two-tootlicd ; maxillary pal])! with third joint 

 not much longer than second, gradually thickened toward 

 apex, fourth thin, small, and pointed ; ligula bilohed, para- 

 glossae not longer than ligula ; laljial palpi with first joint 

 reaching to apex of ligula, second longer, slightly curved, 

 third only about half as long as second and much narrower. 



Cryptohiiiin, Mann. 



II, Antennae not elbow^ed. 



1» Anterior tarsi simple ; thorax much narrowed in 

 front. 



A A, Labrum large, with two strong teeth at 

 apex ; legs long. 



Maxillary palpi witli third joint rather longer than 

 second, fourth very small ; ligula bilobed, the lol)es sepa- 

 rated by a horny plate, paragiossae scarcely longer than 

 ligula ; labial palpi with second joint about one-third longer 

 than first, slightly dilated outward before middle, third 

 much narrower and scarcely half as long. Stilicus, Latr. 



H B. Labrum ending in four teeth at apex ; 

 legs rather short. 



Maxillary palpi with third joint not much longer than 

 second, rather strongly thickened, fourth small and fine ; 

 ligula with its middle portion horny, ending in three strong 

 teeth in front ; paragiossae strong and distinctly longer than 

 ligula ; labial palpi with second joint almost double as long 

 as first, scarcely thickened ; third small and fine. 



Scopaeus, Er. 



2. Anterior tarsi slightly dilated ; thorax more or 

 less quadrangular. 



Labrum two-toothed at apex ; palpi and ligula as in 

 Stilicus. LithocJiaris, Dej. 



S, Fourth joint of hinder tarsi bilobed. 



a. Fourth joint of maxillary palpi scarcely perceptible. 



Labrum two-toothed in middle ; ligula bilobed, the lobes 

 separated by a wide excision, paragiossae slightly longer 

 than ligula ; labial palpi with second joint distinctly longer 

 than first, third much shorter and narrower. 



Sunius, Leach. 



b. Fourth joint of maxillary palpi stout, obtuse. 



