igiQ-] F. C. Fraser : donate larvae and exuviae. 463 



Mask very flat, the mentum slightly rounded, the base fur- 

 nished laterally with a projecting, robust spine and 4 spinous 

 hairs posteriorly, its sides bearing 7 short spines and the antero- 

 lateral corner bearing a single, stout spine, lateral lobes without 

 any armature whatever save for a short, moveable hook. The 

 inner border finely crenulate, the outer bearing two small spines 

 at its base, the mid lobe projecting somewhat like that of an 

 Agrionid, it's border finely crenulate and fringed with short, stiff 

 hairs. The outer surface of the mask coated sparsely with short 

 hairs (pi. xxxiv, figs. 6 and 6a). 



Head triangular, the fore part projecting well in front of the 

 eyes which are rounded and somewhat large. 



Synthorax small, wing-cases short, flat and broad. Abdo- 

 men very broad and greatly depressed as in fact is the whole 

 body of the larva. Dorsal spines on all segments except the last. 

 The three last segments spined laterally. 



Legs robust, femora short, tibiae comparatively long, naked 

 except for a few scattered hairs. 



Hab.— Lies buried in the mud near the borders of running 

 streams. Emerges in considerable numbers about the end of 

 August. 



8. Onychogomphus lineatus, Selys. 



Poona, 9.3. 18. 



Length of body 25 mm. Length of hind femora 5 mm. 

 Length of abdomen 17 mm. 



Almost exactly similar to verticalis. Differs only in its larger 

 size, the short loth abdominal segment, which is not hollowed out 

 above and is similar in size to that of heterostylus. Differs from 

 the latter in having mid-dorsal spines on the same segments as 

 in verticalis. 



Hah. — As for C. verticalis and C. heterostylus. 



Suborder ZYGOPTERA. 

 Subfamily CALOPTERYGINAE. 



g. Matrona basilaris^ Selys. 

 (PI. XXXV, fig. i; pi. xxxvii, fig. i.) 

 Shillong, 4,500-5,000 ft., in streams, Khasi Hills, Assam, 16- 

 20.4.18, N. Annandale, 1320/H2, 1321/H2. 



Length 36 mm. Length of mask 6 mm. Length of caudal 

 appendages 11 mm. 



Head small, eyes globular, antennae typically Calopterygine, 

 the 2nd segment greatly elongated and pigmented on the outer 

 side. This band of brownish pigment is continued across the head 

 and synthorax on to the wing sheaths. Ocelli visible in the last 

 stage. 



Synthorax long and narrow. Wing-cases flat, leaf-like, vena- 

 tion well marked. Abdomen very long and narrow, tapering very 



