274 PBOCEEDINGS OF SOCIETIES. 



Genus 5. — Diploexochtjs (Brandt). 

 Genus 6. — (?) Aclecia (Dana). 

 (Which probably should stand as a representative of a separate 

 family.) 



Family.— PORCELLIONIDJS. 



Genus 1. — Orcrscus (Latreille). 



Body flattened. Head transverse, lateral lobes well developed from 

 superior margin of third ring, which is emarginate in the median line, 

 not attaining to front, passing out beneath the orbits. Internal antennae 

 inconspicuous. External antennae : peduncle, second joint lobed at 

 base. Tige three -jointed, articulations rounded, cupped. Coxae of 

 first, second, and sixth abdominal rings obsolete ; third to fifth, broad, 

 curved. Abdominal false feet articulated beneath external angle of last 

 ring. Peduncle triangular, lamellar. Accessory lobe obsolete. Ischium 

 compressed, trigonal, lamellose, along with three-fourths of peduncle un- 

 concealed. Accessory appendage curved, trigono- subulate, almost con- 

 cealed, arising from basal angle of peduncle, which is truncate. 



Genus 2. — Pobcellio (Latreille). 

 Body flattened or semi-globose (armadilloides). Head transverse : 

 lateral and median lobes well marked, arising from superior margin of 

 third ring, which surpasses frontal line, and is not continuous beneath 

 orbits. Internal antennae inconspicuous. External antennae : second 

 joint broadly lobed internally. Tige two-jointed ; articulations semi- 

 flattened, hairy. Coxae of first, second and sixth abdominal rings obso- 

 lete, Abdominal false feet of last pair articulated beneath basal angles 

 of last ring. Peduncle triangular, lamellar, three-fourths uncovered. 

 Accessory lobe well-marked, arising from base of peduncle, covered by 

 last ring. Ischium compressed, trigonal, lamellose, acuminate, unco- 

 vered. Accessory filaments curved, trigonal, terminating in a filament 

 nearly completely covered by last abdominal ring. 



Genus 3. — (?) Platyabthtts {Brandt). 

 Genus 4. — (?) Deto ( Guerin). 



Family.— LIGIDJE. 

 Genus 1. — Ligia (Brandt). 

 Body flattened. Head transverse. Internal antennae inconspicu- 

 ous. External antennae : second joint, peduncle without lobe. Tige 

 multi-articulate ; segments globose, cupped, hairy. Coxae of abdominal 

 rings: first and second small; third to sixth, well developed. Abdominal 

 false feet articulated in notch at end of last ring, unconcealed. Pedun- 

 cle quadrilateral. Accessory lobe inconspicuous from truncate apex. 

 Ischium somewhat trigonal, scabrous. Accessory appendage as long as 

 ischium, terminating in a filamentous hair. 



