278 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. XXXIII. 



Burma, are distinguished from. atJcinsoni De Selys, from Bengal, by- 

 having the frons less elevated, entirely black in front; 3 yellow 

 lateral thoracic stripes, the middle the widest, instead of 2; and 

 the end of the abdomen a little dilated. (See fig. 5-6.) 



Fig. 6. — Wings of female Orogomphds atkinsoni. De Selys' collection. 



0. splendidus has the wings marked with brownish yellow, the 

 apices reddish brown, and abdominal segments 3-7 black. In 

 speciosus the wings are hyaline, and segments 3-7 are black, with 

 an apical yellow spot on each. 



I. OROGOMPHUS SPECIOSUS De Selys. 



"Taho en Mars (Fea)." Known only from the female. I have 

 not seen specimens. Abdomen 57 mm., hind wing 46 mm. 



Subfamily GO]VIFIII]Sr.3±:. 



Genus ICTINUS Ram bur. 



Fifteen species and one variety of the genus Ictiiius are at present 

 recognized, or twelve species and four varieties, if De Sel^^s's views are 

 followed. Twelve of these sixteen occur in the oriental region. 

 These have been divided into two groups by De Selys, defined most 

 readily by the color pattern of the head, thorax, and legs, as follows: 



First group. — Face largely black; posterior edge of side of thorax 

 black; femora largely black or brown. I. tenax Hagen occurs in the 

 Philippines. It has been described from a single male and an incom- 

 plete female. Accordmg to De Selys it is distinct by havmg the 

 femora with an external double yellow stripe, obliterated on the 

 second femora of the female; the nasus banded, not spotted, with 

 yellow; abdominal segment 7 spotted, not ringed, with yellow; and 

 the inferior abdominal appendage of the male not more divaricate 



