CLAVICORNIA. 339 



A 1, Fourth joint of maxillary palpi very 

 small. 



Antennae eleven-jointed, gradually thickened, with large 

 apical joints ; mandihles acute ; maxillary palpi four- 

 jointed, long, third joint very large, fourth very small, often 

 indistinct ; eyes prominent, granulate ; elytra covering 

 abdomen, latter with six ventral segments ; wings absent ; 

 posterior coxae conical, placed apart ; femora clubbed, 

 tibiae slender. Scydinae7iidae. 



JB 1. Fourth joint of maxillary palpi not 

 small. 



Antennae eleven-jointed, with five larger apical joints, 

 often very slender ; both lobes of maxillae membranous ; 

 body l)oat-shaped ; thorax fitting closely to elytra, latter 

 abbreviated, obliquely truncate at apex ; abdomen with 

 from five to seven ventral segments, first one large ; ante- 

 rior coxae approximated, hinder pairs far apart, enclosed ; 

 femora elongate, tibiae more or less long. Scaphidiidae. 



H h. Tarsi with three joints. 



A 1. Wings with a sort of stalk ; abdo- 

 men with five, six, or seven ventral 

 segments. 



Antennae very slender, with abrupt three-jointed club ; 

 labrum large ; maxillae with two lobes, stem much de- 

 veloped, produced ; bases of labial palpi produced at apex ; 

 metathorax very large ; elytra sometimes truncate at apex 

 and abbreviated ; wings thickly fringed with long hairs ; 

 tarsi with a bristle between claws ; hinder pairs of coxae 

 placed apart, posterior pair often much dilated. 



Tr i cho'pterygid a e. 



li 1, Wings without stalk ; abdomen 

 with three ventral segments. 



Antennae rather short, with three-jointed club ; labrum 

 large ; maxillae with one lobe, stem produced ; bases of 

 labial palpi produced ; elytra covering apex of abdomen ; 

 wings fringed ; tarsi with bristle between claws ; hinder 

 pairs of coxae placed apart, posterior pair dilated. 



Sphaeriidae. 



C c. Tarsi with four joints. 

 Antennae slender, with from nine to eleven joints, club 



7. 2 



