462 Records of the Indian Museum. [Vol.. XVI, 



They emerge from the water about the 2nd week in August, 

 often in great numbers and then fly inland for long distances. 

 Finally the imago comes to rest in low growing trees, on the 

 terminals of branches on the leeward side of the trees. Babul 

 trees seem to be their special selection in the Deccan and about 

 the end of August very few of these trees can be found that have 

 not one or two occupants. 



5. Cyclogomphus heterostylus, Selys. 

 (PI. xxxiii, fig. I ; pi. xxxiv, figs. 5, 5a.) 



Poona, 10.9. 17, 1516/H2. 



Length 21 mm. lycngth of hind femora 4*5 mm. Length 

 of abdomen 15 mm. 



Mask very broad, almost square, the base constricted, very 

 flat, the outer surface coated sparsely with short hairs. Mid lobe 

 straight, not projecting, fringed with longish, fine bristles, the 

 lateral lobes somewhat similar to those of annulatus but without 

 a marked, kukri-like bend at the tip, the inner border furnished 

 with blunt, molar-like teeth, the outer with a long, robust, move- 

 able hook (pi. xxxiv, fig. 5 and 5«). 



Antennae clubbed, four segments, the last minute. Head 

 comparatively larger than in annulatus. 



Abdomen tapering slightly, more torpedo-shaped and the end 

 segments not prolonged as in annulatus. The 8th and 9th seg- 

 ments with a robust, mid-dorsal spine projecting back from the 

 apical border, the loth segment very short, unspined, the 7th to 

 9th segments with short spines laterally. 



Legs moderately short (rather shorter than shown in pi, 

 xxxiii), the femora bearing the same fringe of hairs as seen in 

 annulatus. 



Hah. — Found in running streams crawling on the surface of 

 muddy bottoms or rocks. 



6. Cyclogomphus vcrticalis, Selys. 



Poona, 17.8. 19, 1517/H2. 



Length 21 mm. Length of hind femora 4*5 mm. Length of 

 abdomen 15 mm. 



Almost exactly similar to th'^ last. Differs by having blunt, 

 mid-dorsal spines on all abdominal segments except the 9th and 

 loth, the latter segment is more than twice the length of the same 

 segment in heterostylus. This segment also hollowed on the upper 

 surface. Mask scarcely differing from that of heterostylus. 



7. Cyclogomphus miausculus, Selys. 



(PL xxxiii, fig. 2; pi. xxxiv, figs. 6, 6a.) 



Poona, 9. 8. 19, 1518/H2. 



Length of body 15 mm. Length of hind femora 5 mm. 

 Length of abdomen 10 mm. 



