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PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxxiii. 



wing, antenodals 18-19, postnodals 15-17; on the sides of the 

 thorax in the black area between the two lateral sutures is a 

 row of yellow spots. G. perakensis Laidlaw was described from 

 the Malay Peninsula; abdomen 59 mm., hind wing 54 mm.; front 

 wing, antenodals 22-23, postnodals 17-18; the abdomen is largely 

 black, with the dorsal basal one-third of 7 yellow; Doctor Laidlaw 

 compared his specimen in coloration with a Macrogomphus in the 

 British Museum erroneously determined as quadratus; there is no 

 similarity between perakensis and quadratus. The two remaining 

 species of Gompliidia are separated at once by the color of the head. 

 G. maclachlani De Selys occurs in Borneo, Sumatra, Tonkin, and 

 Anam; abdomen, male 51-55 mm., female 52 mm.; hind wing, male 

 38-43 mm., female 46 mm.; front wing, antenodals 19-21, postnodals 

 10-14; face entirely black excepting part of the frons. G. t-nigrum 

 De Selys is known only from North India; abdomen 52 mm., hind 

 wing 39.5 mm.; front wing, antenodals 15-16, postnodals 9-10; face, 

 vertex, and occiput largely yellow. An eighth species is described 

 below as new, from a specimen fi'om Siam. 



4. GOMPHIDIA ABBOTTI, new species. 



Abdomen, male without appendages 50 mm., superior appendages 

 3.5 mm.; hind wing, male 41 mm. 



Wings hyaline, without trace of basal spot; membranule white; 

 stigma very dark brown, covering 4 or 5 cells, brace vein present; 



Fig. 9.— Wings of male Gomphidia abbotti from Siam. 



antenodals, front wing 18-19, hind wing 12-13; postnodals, front 

 wing 11, hind wing 10-11 ; triangle in front wing 3 cells long, the first 

 cell divided, making 4 cells in the triangle, followed b}^ 3 cells, then 2 ; 

 triangle in hind wing 2 or 3 cells long, followed by 3 or 4 cells, then 2 ; 

 sub triangle in front wing once divided, in hind wing free; cubital 



