356 THE CANADIAN ENTOMOLOGIST 



XXIII, fig. 11) gradually widening from base to distal third, where 

 the breadth is about one-fifth of their length, apically acuminate, 

 terminating in a long slender point; division slightly proximad of 

 the middle. There is a pale ill-defined median area of greater or 

 less extent, the peripheral parts being more transparent. The dark 

 pigment is distributed along the median tracheae, the lateral 

 branches beyond the pale area, and in three transverse, more or 

 less crescentic bands, one at the division, another near the apex 

 and a third between these two; one of these, the basal or the 

 middle band is more conspicuous than the others. The apical 

 band is faint and may be scarcely recognizable. 



The colour-pattern in other respects is entirely similar to 

 that of /. verticalis. All my specimens are rather conspicuously 

 marked but it is probable that the same variations are found in 

 i". cenntla as in /. verticalis. The general colour of alcoholic 

 specimens is a moderately dark brown, spotted and banded with 

 pale yellowish. The dorsum of the head is marked with a number 

 of pale roundish spots, the thorax is more or less distinctly 

 variegated with pale markings and the abdomen longitudinally 

 striped, there being a pale median line between two broader dark 

 bands, and on each side a dorso-lateral and a lateral pale streak. 

 The legs are pale, distinctly ringed with brown, both femora and 

 tibiae being darkened at base, and having each two dark annuli. 



Length of body (without gills) 11.2-12.5; outer wing-pad 

 3.6-3.9; gills 6; hind femur 3. 



Explanation of Plate XXIII. 



Fig. 1. Lestes unguiculatus, teeth of median and lateral 

 lobes of labium, greatly magnified. 



Fig. 2. Lestes forcipatus, teeth of median and lateral lobes 

 of labium. 



Fig. 3. Lestes rectangular is, teeth of median and lateral 

 lobes of labium. 



Fig. 4. Enallagma ebrium, right lateral appendage of male 

 nymph, profile view. 



Fig. 5. Enallagma ebrium, same, dorsal view. 



Fig 6. Enallagma hageni, right lateral appendage of male 

 nymph, profile view. 



