9.8 Records of the Indian Museuni. [Voi,. XXII, 



row of short hairs, and split in the middle by a moderately deep, 

 very narrow, cleft. The lateral lobes are large, slightly concave 

 internally, the distal border rounded, with a slight notch near the 

 apex ; the inner border is slightly and irregularly denticulate along 

 the distal half of its length ; the denticulations of the right and 

 left lobes do not correspond, as may be seen from text-fig. 26. 

 The movable hook is large, strongly built, nearly as long as the 

 outer margin of the lateral lobe below its insertion, and with a 

 slightly nodding apex. No setae -present either on the mentum or 

 on the lateral lobes. 



A comparison between this labium and the types found in the 

 Gomphinae and Petaliini shows that it differs from them mainly 

 in the relative proportionate length of the parts of the lateral lobes 

 and movable hook. In the two groups mentioned the movable 

 hook is alwaj-s either longer than or at least equal to, the 

 length of the margin below its insertion: the shorter movable 

 hook here decribed suggests a comparison with the Megapodagrion- 

 inae and Synlestinae. The proportionate amount of projection of 

 the apical portion of the lateral lobe, internally to the movable hook, 

 is again much less than in the Gomphinae and Petaliini, while the 

 notching of the apex, and the appearance of the most prominent 

 denticulations just below it, suggest the beginnings of the division 

 of this part of the lobe into distinct teeth, as in Z3'goptera. 



Thorax stoutly built, the prothorax without spines, but with 

 its antero-lateral angles produced somewhat cephalad, as two lobes 

 with rounded apices. The prothorax and median portion of the 

 synthorax are very strongly rugose or tuberculated. 



Wing-sheaths laid parallel along the middle line, those of the 

 hindwing projecting backwards to about the middle of the second 

 abdominal segment. This probably indicates that the larva was 

 in the penultimate instar. The sheaths are hairless, but with some 

 patches of dirt adhering to them ; the sheath of the hindwing is a 

 little broader and very slightly shorter than that of the forewing. 

 (The right pair of wing-sheaths was dissected off by Mr. Laidlaw, 

 as shown in plate XIII, fig. i, and mounted on two separate slides, 

 from which the photomicrographs in plate XIII, figs. 2, 3, were 

 taken) . 



The wing-venation is of the very greatest interest. But a 

 study of the photomicrographs shown in plate XIII, figs. 2, 3, 

 although it reveals many points of interest, does not yield enough 

 evidence to allow of a definite placing of the larva in its correct 

 systematic position. After examining these, and also the slides from 

 which they were prepared, I obtained Mr. Laidlaw's permission to 

 cut off the left hindwing and examine it separately on a slide. 

 The Canada balsam mounts prepared from the right fore and 

 hind wings were not satisfactory ; hence I examined this further 

 wing in 70% alcohol only. By using a strong light, transmitted 

 vertically upwards through the wing, it was possible to bring out 

 much more definitely the pale bands foreshadowing the actual 

 imaginal venation, especially on the basal part of the wing, which, 



