808 



PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxiii. 



species of Needham's subgenus Stylurus and to related species of 

 which fraternus and vastus may serve as examples. G. xanthenatus 

 is separated at once from melsenops by the spotted upper lip, by the 

 narrower dorsal thoracic stripes, not widening below, by the absence 

 of a distinct pale antehumeral stripe, by the wider black stripes on 

 the lateral thoracic sutures, by the annulation of segments 3-7, and 

 the greater extent of yellow on 9. G. personatus De Selys is known to 

 me only from the description. It is separated from xanthenatus by 

 the presence of a pale antehumeral stripe, sometimes interrupted, by 

 having the stripes on the lateral thoracic sutures very narrow, the 

 first interrupted, by the pectus largel}?- yellow, and by the abdomen 

 with a longitudinal middorsal stripe and not annulated. Gornphus 

 pryeri De Selys, from Japan, and GompJius scissusMcLachlan, from 

 western China, are two related species known only from female 

 specimens. Both are distinct from xanthenatus by a number of 

 characters. 



Pig. 34.^WlNGS OF FEMALE ONYCHOGOMPHUS ANNILARIS FROM BURMA. 



Genus ONYCHOGOMPHUS De Selys. 



Of the about forty described species in this genus, seventeen are 

 oriental. These arranged alphabetically are: 



0. annularis De Selys. Known from two incomplete males from 

 North Burma. Abdomen 34-37 mm.; hind wing 29-32 mm.; 

 abdominal appendages not known. (See fig. 34.) 



0. hiforceps De Selys. Described from a single male from India; 

 recorded from Tonkin by Martin. Abdomen 41 mm.; hind wing 

 32 mm. (if measurements are correct the abdomen is relatively long) ; 

 male superior abdominal appendages longer than 9 + 10, turned 

 abruptly downward near apex ; inferior appendage equally long, near 

 apex curved abruptly upward, the two branches separated for a 

 distance near the base to inclose an oval space. 



