148 Mr. R. M‘Lachlan’s Monograph of the 
Anterior wings dark fuscous, with numerous small rich golden 
spots with a reddish tinge; on the costal margin, large spaces of 
the ground colour and conspicuous golden spots alternate. Pos- 
terior wings dark blackish-grey. Legs brown, darker externally. 
Abdomen dark blackish-fuscous, scarcely paler beneath, In the 
male the lobe from the upper margin of the last segment (during 
life) is broad, with a truncated and emarginate apex, appearing 
more pointed in dry specimens; app. sup. small and somewhat 
triangular; app. inf. larger, rather broad and directed upwards. 
Varies in the number and intensity of the golden spots; in 
some examples the anterior wings appear entirely golden-yellow, 
and sometimes in fresh examples of the female the wings are en- 
uirely fuscous. 
Expanse of fore-wings, ¢ 6—63 lines, 2 7—8 lines. 
A common species about standing waters, appearing In summer. 
It is wonderfully active, and runs with facility on the surface of 
the water. 
Without doubt more species of this genus (as here restricted) 
will be found in this country. 
Genus Cyrnus, Siephens. 
Antenne not so long as the wings, basal joint but little longer 
or stouter than the others. Head very hairy. Ocelli absent. 
Palpi the same as in Polycentropus. Mesothorax robust. An- 
terior wings rather narrow, especially at the base, but slightly 
dilated before the rounded apex; hairy clothing short and dense, 
but easily removed ; neuration somewhat like that of Polycentro- 
pus, but.only the forks 2, 3, 4 and 5 present. Posterior wings 
slightly folded, shorter and rather broader than the anterior ; 
costal margin slightly concave; anal portion angular, scarcely 
developed ; no discoidal cell; forks 2 and 5 present. Legs mode- 
rately long; intermediate tibia and tarsi dilated in the female ; 
anterior tibia with one median and two equal apical spurs; in- 
termediate and posterior tibiae each with two pairs of long un- 
equal spurs. Abdomen slender. In the male there is usually a 
short lobe from the upper margin of the last segment; app. sup. 
small; app. inf. large, with broad apices; sometimes there are 
straight app. intermed. In the female there are small, but rather 
prominent, lateral valves. 
Larva unknown ; inhabiting standing and slowly-flowing waters. 
The more slender form and the differences in the neuration will 
readily separate these insects from Polycentropus, which they 
otherwise greatly resemble. 
