Romblonella

David Emmanuel M. General, 2016, Romblonella longinoi (Hymenoptera: Formicidae), a new species and first record of the genus from Sabah, Malaysia, with a key to the species of Romblonella Wheeler, 1935, Halteres 7, pp. 112-119 : 118

Key to the species of Romblonella , based on the worker caste

1 In profile, petiole longer than tall, relatively flat dorsally, without a round dorsal outline ……………….... R. palauensis Smith, 1953 ( Palau Islands)

- In profile, petiole taller than long, with a round dorsal outline.....……….……...……2

2 In full-face view, dorsum of head longitudinally carinate……………………..3

- In full-face view, dorsum of head reticulate…………………………………...6

3 Dorsum of head with interrupted longitudinal carinae…….…….. R. heatwolei Taylor, 1991 ( Australia)

- Dorsum of head with longitudinal carinae that extend from posterior margin of clypeus to posterior margin of head………………..4

4 Mesosoma, petiole and postpetiole dorsally longitudinally carinate ………… R. yapensis Smith, 1953 ( Micronesia: Caroline Islands)

- Mesosoma, petiole and postpetiole dorsally reticulate…………………………………...5

5 In full-face view, sides of head diverging posteriorly; frontal carinae longer, almost reaching posterior margin of head; posteromedian clypeus as wide as frontal lobe……………….……… R. longinoi sp. n. (Mamutik I., Borneo)

- In full-face view, sides of head subparallel; frontal carinae shorter, more than one eyelength from posterior margin of head; posteromedian clypeus wider than frontal lobe..................…… R. townesi Smith, 1953 ( Marianas Islands)

6 Dorsum of first gastral tergite longitudinally costulate with interstitial punctulae; in fullface view, head subrectangular (CI 84-89); median clypeus narrow, only as wide as frontal lobe….....… R. coryae General, 2015 (Palawan I., Philippines)

- Dorsum of first gastral tergite smooth, punctulate or reticulate but never longitudinally costulate; in full-face view, head subquadrate (CI>94); median clypeus wider than frontal lobe………………….....7

7 Dorsum of first gastral tergite smooth ………….. R. liogaster (Santschi, 1928) ( Fiji I.)

- Dorsum of first gastral tergite finely punctulate or reticulate, but never smooth..........................................................8

8 Dorsum of mesosoma longitudinally carinate, with scattered cross-hatches; median clypeus without well-developed median carina........................... R. scrobifera (Emery, 1897) (New Guinea)

- Dorsum of mesosoma reticulate; median clypeus with well-developed median carina………………………………………9

9 In dorsal view, propodeal spines divergent throughout their entire length; body concolorous yellow………….. R. elysii ( Mann, 1919) ( Solomon Islands)

- In dorsal view, propodeal spines basally divergent but distal half parallel or curved slightly inward; body dark-brown with lighter appendages...……………… R. opaca (F. Smith, 1861) ( Indonesia, Philippines)