Prodasineura laidlawi (Forster in Laidlaw, 1907) - excluded species

Fig. 8F

Diagnosis

Bluish Prodasineura that resembles P. coerulescens and P. hoffmanni with thin antehumeral stripe, bluish abdominal tip, appendages in males. Bluish marking covers most of S9, extends to S 8 in P. laidlawi while only dorsal area of S9 blue in P. coerulescens and P. hoffmanni (Kosterin 2015) . Female easily separated from P. coerulescens and P. hoffmanni by posterior pronotal lobe of prothorax having large rounded plate mid-centrally (Fig. 8F) rather than two separate ear-like processes, disposed laterally in P. coerulescens (Fig. 5D), midposteriorly in P. hoffmanni (Fig. 5F).

Remarks

Asahina (1969) reported P. laidlawi from Dinh Quan District of Dong Nai Province, but included no figures of its structures. Other studies in Cat Tien National Park and Dinh Quan District of Dong Nai Province record the similarily marked species P. coerulescens but not P. laidlawi (Do & Dang 2007; Kompier 2019; this study). We suggest that the male of P. laidlawi as identified by Asahina (1969) was probably P. coerulescens . The occurence of P. laidlawi in Vietnam is also unlikely given the known range of P. laidlawi, which has been reported from Malaysia (Orr 2005) and Thailand (Asahina 1983).