78 MR. F. F. LAIBLAW OX THE [Fob. 4, 



other species possessing this character (J/, cincta Rambur, loest- 

 icoodi Salys, horneensis, fumata Kriiger), in which the tooth Ues 

 at the middle of the length of the appendage. 



Idioxtx dohrxi KJrliger. (Plate V. fig. 4.) 

 Idionyx dohrnii, Kriiger, Stett. ent. Zeit. 1899, p. 326. 

 2 . Length of abdomen 26 mm. Length of hind wing 26"5 mm. ; 

 breadth 8-5. 



Triangles of all foui' wings undivided, those of the front ^vings 

 with their anterior borders somewhat broken near their outer 

 angle. Supra -triangular space crossed by a single nerve in all 

 four wings. Triangles followed by a single row of cells ; in the 

 hind -vvings the nerve bordering the first cell of the i-ow ends 

 against the middle of the outer wall of the triangle, so that the 

 second cell comes into contact ■with it {ef. characters of /. optata 

 Selys, in Ann. Mus. Gen. (2) x. p. 472). On the margin of the 

 win^s this single row breaks up into 6 cells on the fore, 7 on the 

 hind wings. The median space in the fore wing is traversed by a 

 single nerve ; hinder wing with two nerves in the median area. 



Sectors of arculus with very long stalk, rising in both front and 

 hind wings almost in the angle made by the arculus and the sub- 

 median vein. Wings tinged with brownish yellow, which is 

 darkest at the base. 



Head brown, with the upper Hp dull yellow. Vertex metallic 

 blue. Thorax brown-green, with three stripes on each side : the 

 front one is yellow at the base of the front pair of legs, and fades 

 into brown as it passes up along the thorax ; the second and third 

 are vellow. The abdomen is very dark bro"vvn, fading into black 

 at tiie end ; the ventral edge of all the segments except the first 

 marginal with a fine yellow line, which is broadest on 2-3. 



This species difiers from all its congenei'S in having the median 

 space of the lower -s^-ing traversed by two nerves. It is also a trifle 

 smaller than the other species. 



One female from Kwala Aring taken in September 1899. 

 I have given the characters of this and the preceding species 

 rather fully because they show some points of variance with the 

 types described by Kriiger, and in the case of the first between 

 the male and female. 



Family ^SCHNID^. 

 Subfamily ^schnin.s;. 

 Anas guttatus (Burm.). 

 Anax guttatus, Kirby, Cat. Odonata, p. 84. 

 One specimen from Kwala Aring. Widely distributed in the 

 East Indies. 



Amphleschxa ampla (Ramb.). 



AmphAreschna ampla, Kirbv, Cat. Odonata, p. 93 ; Karsch, Ent. 

 Nachr. xvii. (1891) no. 18, p.' 10. 



