title: A new species of Cales (Hymenoptera: Aphelinidae) parasitizing Bemisia pongamiae (Takahashi) (Hemiptera: Aleyrodidae) in Taiwan, with a key to world species of the Cales spenceri-group.
abstract: BACKGROUND
  The genus Cales has been extensively revised recently and divided into two species groups, the noacki- and spenceri-groups Mottern et al. (2010), Mottern and Heraty (2014).
  
  
  CONCLUSIONS
  Cales motterni Polaszek, Shih & Ward sp. nov. is described from two females reared from the whitefly Bemisia pongamiae from Taiwan. The species belongs to the spenceri- group, and has a characteristic and unusual antennal clava. A key to the four species currently known from the spenceri-group is provided.
authors.affiliation: Natural History Museum, London, United Kingdom.
authors.forename: Andrew
authors.initials: A
authors.lastname: Polaszek
authors.affiliation: National Taiwan University, Taipei, Taiwan.
authors.forename: Yuan-Tung
authors.initials: YT
authors.lastname: Shih
authors.affiliation: Natural History Museum, London, United Kingdom.
authors.forename: Samantha E
authors.initials: SE
authors.lastname: Ward
keywords: Parasitoid; taxonomy; whitefly pests