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PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXIIl. 



almost parallel, apically turned rather abruptly downward ; inferior 

 appendage not (piite half as long, the branches inclosing an oval space, 

 in profile forming a semicircle ; female vulvar lamina short and 

 rounded, divided to its middle by a narrow incision; occipital plate in 

 both sexes bearing a number of small spines. 



0. madacMani De Selys. Described from a single female from 

 North Burma. Abdomen 43 mm. ; hind wing 38 mm. ; vulvar lamina 

 destro3^ed . 



0. 7n-Jlatnnn De Selys. India. Abdomen 38-39 mm.; hind wing 

 33-36 mm.; male superior appendages longer than 10, curved toward 

 each other and downward ; inferior appendage of equal length, almost 

 entirely divided into 2 contiguous branches, seen in profile curved 

 upward, bearing near the middle on the upper surface a lateral tooth; 

 female yulvar lamina very long, broad at the base, divided into 2 con- 



FiG. .35.— Wings of male Onychogomphus saundersii from Burma. 



tiguous lanceolate branches of which the acute apices reach the tenth 

 segment. 



0. rnodestus De Sel}'S. India. Abdomen 27-28 mm. ; hind wing 

 23-29 mm.; male superior appendages as long as 9 + 10, slightly 

 curved toward each other and downward; inferior appendages as 

 long, deeply divided into 2 contiguous branches. 



0. nigrescens Laidlaw. Described as a variety of geoTnetricus, from 

 a single female from the Malay Peninsula. Doctor Laidlaw agrees 

 with my suggestion to him that this is really saundersii. The ve- 

 national character pointed out by Doctor Laidlaw is not peculiar to 

 the species, but is common to a large group of genera. 



0. reinwardtii De Selys. Java. Abdomen 33 mm.; hind wing 

 26-29 mm.; male appendages not known; female vulvar lamina one- 

 third as long as 9, triangular, the apex bifid; occipital plate in both 

 sexes with 10-12 small black spines. 



