134 Records of the Indtan Museum. [Vor XTE, 
The description given by de Selys of this insect scarcely does 
justice to its beautiful colouring which is well preserved in spirit 
specimens, The head, prothorax and thorax are a rich dark olive 
green above, passing on the sides to a beautiful shade of blue. 
The first three segments of the abdomen and the last three 
are of a beautiful cherry red colour, the intermediate segments 
being intense black. 
Range: Ceylon, India, Burma, Malay States, Sumatra, Borneo. 
A number of the larvae of C. coromandelianum (Fabr.) were 
taken in the Museum tank, and were hatched out in the Museum 
(No. °3°). The larva shows, especially in the structure of the 
anal lamellae, considerable differences from the larva of such a 
genus as Pseudagrion. ‘The following is a brief account :— 
Body sandy yellow or brown in colour. Total length about 
20 mm. including the anal lamellae. 
Head broad, flat. I can find no indication of the transverse 
frontal ridge of the adult. 
Mask when folded just reaching base of second pair of legs. 
Its outer margin carries about 6 or 7 short stout spines along its 
distal half. On either side of the 
middle line is an oblique row of 5 
setae, diverging distally; the outer- 
most being by far the largest. Ante- 
rior margin of mask bluntly angular. 
The palpi each bear 7 long setae in 
addition to the moveable hook (see 
fig. 1). The length of each of the 
middle pair of legs is about 7 mm. 
The abdomen is cylindrical and 
Fre. 1.—Mask of larvalform of Cevz- tapers very ‘gradually backwards. 
agrvion covomandelianum (Fabr.). Each of the segments has a ring of 
short blunt setae set around its hin- 
der margin, and each of the last five segments has in addition a pair 
of similar setae dorsally, one on either side of the middle line near 
the end of the segment. The pair on segment Io are much more 
remote from each other than those on the other segments. 
The anal lamellae (gills) are leaf-like, ob-lanceolate ; 4—5 mm. 
long, I'5 mm. wide, in one or two individuals acuminate but 
more often irregularly rounded at the apex. They are not jointed 
nor marked with a transverse fold, but the basal half is stouter 
and more strongly chitinized than the apical part. 
Each has two stout, main tracheal tubes forming as it were a 
mid-rib from which a large number of branches run outwards 
increasing the resemblance to a leaf. 
In the lateral pair of lamellae the mid-rib lies nearer to the 
ventral than to the dorsal margin, in the central lamellae the re- 
verse condition obtains. 
In each lateral lamella the basal two-fifths of the mid-rib 
bears a row of chitinous teeth on its outer side. In the central 

