Taxonomic revision of Old World members of the feather louse genus Columbicola (Phthiraptera: Ischnocera), including descriptions of eight new species Author Adams, Richard J. Author Price, Roger D. Author Clayton, Dale H. text Journal of Natural History 2005 2005-12-23 39 41 3545 3618 http://dx.doi.org/10.1080/00222930500393368 journal article 10.1080/00222930500393368 1464-5262 5220802 19. emersoni species group The four species of this group are from the host genera Ptilinopus and Alectroenas . They have the anterior marginal head carina complete, rounded ( Figure 174 ) or indented ( Figure 182 ); body elongate; each side of metanotum with three long, one short setae ( Figure 3 ). Male antenna with ( Figure 174 ) or without ( Figure 178 ) expanded scape and third segment spur; mesosome deeply ‘‘V’’-shaped, with ( Figure 176 ) or without ( Figure 185 ) well defined transverse anterior portion; each side with three or four pores. Female subgenital plate groove variable, rounded anteriorly; 0–4 minute to medium lateral setae.