( 20 ) 



Family.— ITEAD^. 



Genus 1. — (?) TRiCHONiscrs (Bra?idt). 

 Genus 2. — (?) Itea {Koch, in part). 



Gfenus 3. — (?) I'HlLOUQiiiA (mihi). 



Body flattened. Head round ; no median or lateral lobes. Internal 

 antennae inconspicuous, three-jointed. External antennae : second joint 

 round, not lobed. Tige subulate, five-jointed ; smooth. Coxae of first 

 abdominal ring small and inconspicuous ; second to fifth, narrow, linear, 

 well marked ; sixth, nearly obsolete. Abdominal false feet : last pair 

 completely uncovered. Peduncle somewhat triangular, articulated in 

 notch at posterior margin of last joint. Ischium trigonal, subulate, 

 smooth, terminating in a filament. Accessory lobe well marked, spring- 

 ing from side of, and nearly attaining, extremity of apex of peduncle. 

 Accessory filament long, subulate, filamentous, smooth. 



This genus is very closely allied to Itea, which is described by 

 Zadach as having the exterior margin of the peduncle of the abdominal 

 false feet free; lateral processes of the front present, beneath the supe- 

 rior frontal margin, above the base of the antennae ; the internal an- 

 tennae one- jointed. Characters, if correctly given, sufficient to constitute 

 the above a genus. 



Some, perhaps, will be inclined to substitute the term genus for 

 family in the above Table, making sub-genera of most of the genera. 

 Against this custom, too prevalent now-a-days, I must enter my protest : 

 every distinct set of forms possessing one or two important parallel cha- 

 racters in common, should rather constitute a genus, than by, as is too 

 often done, grouping a number of these in one genus, necessitate the 

 formation of sub-groups, which are always most puzzling to the student, 

 and of no use unless to the system atist addicted to mere numher of fami- 

 lies in some preconceived order of numeral arrangement. 



List of British Specie^ of Oniacoidea. 



Family.— ARMADILLIDuE. 



Genus. — Armadillium {Brandt). 



(Armadillidium of Brandt shortened in conformity to modem usage.) 



Armadillium vulgare {Latr. sp.) 



Synonyms: Oniscus armadillo {Linn.), 0. cinereus {Zenk.), Arma- 

 dillo vulaa/ris {Latr.), A.variegatus {ib.), Armadillidium Zenckeri {Br.), 

 Armadillo opacm, variegatm^ Willii {Sehmffer). 



