STAPIIYLINIDAE. 105 



Tilea was established by Faiivcl upon the insect found abund- 

 antly in British Columbia, which we suppose to be Lesteva fasco- 

 nigra jVIackl. Ephelis has been founded by Fauvel upon sonae 

 species described as Coryphium, and we have some doubt whether 

 they should be separated. Of Eudectus we have an undescribcd 

 species from Louisiana, collected by Mr. Salle. 



Tribe IX.— PROTIIVIIVI. 



This tribe contains a very small number of species, approaching 

 closely to the preceding tribe, but differing by the prustcrnum 

 being corneous behind the coxa?, and by the head having no ocel- 

 lus in our genera, and but one in certain foreign genera. The 

 antennas are inserted under the sides of the front ; the anterior 

 coxa; are transverse, subconical, and somewhat prominent; the 

 hind coxae are transverse; the hind trochanters are at the inner 

 margin of the thighs; the tarsi are 5-jointed. 'J'he species live 

 in fungi and under bark. 



Our two genera, without frontal ocellus, are distinguished by 

 the form of the antenna?. 



Aiitenna3 with the joints 9-11 larger. Protinus. 



Antennae with tlie eleventh joint only larger. Megarthrus. 



The latter genus is further remarkable for having the sides of 

 the thorax frequently with an angle behind the middle; the thorax 

 is also always channelled. 



Tribe X.— PIESTIXI. 



Insects having a slender and frequently very depressed form, 

 living under bark. The prothoracic spiracles are covered, and 

 the whole prosternum is corneous, and in some genera separates 

 the anterior coxae so that the eoxal cavities become entire. The 

 antenniB are situated under the sides of the front, straight, slightly 

 thickened externally. The second ventral segment is longitu- 

 dinally elevated at the middle. 



In this tribe the present family shows its strongest tendency 

 towards the collective Clavicorn families in Cuoujidae; in the 

 next we will find this tendency towards another member of the 

 same series. 



Two groups are indicated : — 

 Elytra not longer than metasteriium. Piesti. 



Elytra longer than metasternuni. Tuiconuki. 



