K0.1571. DRAOONFLIES OF BVRMA AND SIAM— WILLIAMSON. 281 



4 male wings and 10 female wings (in three cases slightly abnormal, 

 the divisions obscured or disguised) ; triangle in front wing 3 cells 

 long, the first cell divided, making the triangle 4-celled — in 3 male 

 wings and 15 female wings (disguised in one case) ; triangle in hind 

 wing 2 cells long and 2-celled — in one male wing; triangle in hind 

 wing 3 cells long and 3-celled — in 5 male wings and 19 female 

 wings; triangle in hind wing 3 cells long, the first cell divided, making 

 the triangle 4-celled — in 2 male wings and 5 female wangs. Upper 

 lip entirely black in one male and one female; upper lip with 2 basal 

 yellow spots, more or less distinct, in all the others. Nasus with a 

 more or less distinct yellow spot at either end in all. Pale area of 

 fi'ons above of about uniform width in three males and five females; 

 narrowed or divided in the middle in one male and seven females. 

 Ictinus melsenops, race sumatranus Kriiger from Sumatra does not 

 seem sufficiently different. (See figs. 7 and 8.) 



3. ICTINUS PERTINAX Hagen. 



One male from Burma collected by Earnshaw. 



This has the? upper lip black, with two small squarish basal spots, 

 separated by black, about equal to their width; the antehumeral 

 stripe widely divided. I have two adult males and a teneral male 

 from Tonkin. This teneral specimen, which I refer to "pertinax, has 

 the spots on the upper lip larger and connected ; and the antehumeral 

 stripes are narrowed but not divided above. 



Genus GOMPHIDIA De Selys. 



The seven described species all occur in the Oriental region. G. 

 krugeri Martin is rivalled in size only by perakensis Laidlaw. It 

 is known from Tonkin; abdomen 63 mm., hind wing 50 mm.; front 

 wing, antenodals 24, postnodals 13-14; distinct from all the others 

 by having the dorsal thoracic stripes on either side of the middorsal 

 carina joined at their upper end with a spot which represents the 

 upper end of the antehumeral stripe. G. conjiuens De Selys occurs 

 in Central China, Tonkin, and Anam; abdomen 53 mm., hind wing 

 48 mm.; fi'ont wing, antenodals 19-20, postnodals 11; distinguished 

 from all others by having the dorsal thoracic stripes joined below with 

 the mesothoracic half collar. G. javanica Foerster, from Java, has 

 the abdomen about 53 mm., hind wing 40-43 mm.; front wing, 

 antenodals 16-18, postnodals 12; it is peculiar in having the sub- 

 triangle of the front wing free, not divided (the sub triangle of the fi-ont 

 wing is sometimes free in maclacMani, but in javanica the rhinarium 

 is yellow, while it is black in maclaclilani) . G. Mrsddi De Selys 

 and perakensis Laidlaw are peculiar in having; a relatively large 

 number of postnodals. G. kirscliii occurs in the Philippines, Borneo, 

 and Tonkin; abdomen 45-48 nun., liind wing 38-42 nun.; front 



