STAPIIYLINIDAE. 99 



2. Hind tarsi with the joints 1-4 nearly equal ; 3. 

 Hin<i tarsi with the joints 1--1 decreasing gradually in lengtli ; 4. 



3. Thorax subquadrate ; labrum hilobed. Lathrobium. 

 Thorax nari'owed in front; labium 4-toothed. Scopeeus. 



4. Thorax narrowed in front ; y. 

 Thorax subquadrate ; 6. 



5. Labrum 4-toothed (last two abdominal segments elongated). 



Echiaster. 

 Labrum with two acute teeth. Stilicus. 



6. Labrum vvitli two small teeth. Lithocharis. 

 Labrum rounded, emarginate at tip, Dacnochilus. 

 Labrum entire, elytra very short Liparocephalus. 



B. Hind tarsi with the fourth joint lobed ; 



Last joint of maxillary palpi slender, very minute ; 2. 



Last joint of maxillary palpi obtuse. Paederus. 



2. Elytra longer than the thorax. Sunius. 



Elytra shorter than the thorax. Stilicopsis. 



Group in. — PinopMli. 



Very elongated cylindrical species, sometimes of large size, and 

 found under bark of trees ; some species of Palaminus are also 

 found on leaves of trees. Our genera are but two, both of wide 

 distribution: — 



Abdomen distinctly margined. Pinophilus. 



Abdomen not margined. Palaminus. 



Tribe v.— TACHYPORINI. 



The prothoracic spiracles are visible ; the anterior coxae are 

 large, conical, and prominent, with the trochanters very distinct. 

 The antennre are inserted under the lateral margin of the front. 



Our genera may be separated into five groups: — 



Posterior coxaB transverse. 



Antennse 10-jointed, tarsi 4-jointed. nYPOCYPTi. 



Antennae 11-jointed, tarsi 5-jointed. 



First joint of hind tarsi nearly as long as the tibia. Posterior cox:? 



apparently connate with tlu^ nietast(;rnurn. Tiuchopsknii. 



First joint of hind tarsi moderate or short. Posterioi- coxvo free. 



Head not margined. Tachypori. 



Head margined. IJoLrroisii. 



Posterior coxjb triangular, prominent. 



Antennae 11-jointed, tarsi ij -join ted : head not margined. Habroceri. 



