Pacijic Coast of North A merica. 323 



a' . Eyes lateral. Antennce of the first pair small, with 

 llagellum obsolete. Antennae of the second pair 

 short, with peduncular joints dilated; rudimentary 

 llagellum containing five articles and equal in length 

 to the width of the head. Mandibles with a three- 

 jointed palp and with cuttiug-part composed of live 

 teeth 28. Jceroi>sis. 



25. J^RA, Leach. 



67. Jcera wakishiana^ Spence Bate. 



J(xra wahishiana, Spence Bate, Lord's Naturalist in British Columbia, 

 ii. 1866, p. 282; C. Bovallius, Bihang till K. Sv. Vet.-Akad. Handl. 

 ii. 1886, no. 15, p. 49. 



Hob. Esquimault Harbour, British Columbia. 



66. Ianthe, Bovallius. 



Analytical Key to the Species of Ianthe. 



a. Head with prominent rostrum ; lateral mar- 

 gins incised and produced into two angula- 

 tions. Second and third thoracic segments 

 with epimeral lobes double. Terminal 

 segment of body with lateral angulations 

 and central portion acute 68. /. triangulata, sp. n. 



d . Head without rostrum ; lateral margins 

 entire and produced into one anterior 

 angulation. Second and third thoracic 

 segments with epimeral lobes single. 

 Terminal segment of body with lateral 

 angulations and central portion blunt and 

 rounded 69. /. erostrata, sp. n. 



68. Ianthe triangulata^ sp. n. 



Surface of body smooth ; colour yellow, marked with black 

 dots. 



Head with rostrum in front equal to one half the length of 

 head. Anterior margin lobate, between the rostrum and the 

 lateral angulations. The side of the head is produced in two 

 angulations, the upper one extending in an oblique direction 

 and not reaching beyond the anterior margin of the head. 

 The first pair of antennae are not as long as the width of the 

 head. Tiie second pair of antennas are longer than the body. 



The lateral margins of the first segment are produced into 

 two angulations ; those of the second and third into two, with 

 the epimera produced into two-lobed angulations ; those of 

 the fourth into two lobes, the small epimeral lobe or angula- 

 tion between ; and those of the fifth, sixth, and seventh into 

 one large upper lobe and one small lower lobe. 



