HYDROMETRID^;. 563 



Underside black with a slight silvery gloss. Antenna light 

 brown. Legs light-brown ; thigh* paler beneath ; 1st pair black, 

 yellow beneath, the colour broader and paler on the inner side 

 at the base. 



Head; at the sides a narrow silvery line. Antennae light-brown, 

 the ends of the joints darker j 3rd extremely minute ; 4th dark- 

 brown. Eyes and Ocelli black. Rostrum black ; 1st and 2nd joints 

 dusky-yellowish. 



Thorax. Pronotum ; the 1st region posteriorly not defined, its 

 middle with a slight yellow keel ; hinder angles raised into a long 

 obtuse tubercle ; disk behind the anterior region in front slightly, 

 transversely crenate ; as far as the hinder angles without a per- 

 ceptible keel, but with a slight, broad, longitudinal depression on 

 each side of the middle ; the undercurved sides posterior to the con- 

 striction, with a yellow line, broad posteriorly, narrow anteriorly ; 

 scutellar process convex, reddish or yellowish-brown in the middle, 

 the colour extending forwards to before the hinder angles, and 

 gradually merged into the darker colour of the disk, posteriorly, 

 generally extended to the apex; the middle with a slight keel 

 ceasing at the broad, flattened margin. Elytra black-brown, viewed 

 obliquely with a blueish shade, and sometimes with 2 yellowish 

 streaks j nerves black, with golden scale-hairs. Wings white, on the 

 anterior margin a rather large, pale, brownish-gray spot. Sternum- 

 black with a whitish gloss ; Prosternum yellowish towards the sides, 

 which, seen from above, are bright silvery ; Mesosternum with a fine, 

 shallow, middle channel, deepest in front, and a slight, short, raised 

 line on each side of it diverging backwardly towards the coxae ; the 

 sides viewed from above dull black bounded by glossy, brassy hairs ; 

 Metasternum in the $ , with a scarcely perceptible black tubercle. 

 Sheath of the 2nd and 3rd pairs of coxae above black, beneath pale 

 ochreous, margined internally with a black line and the 2nd pair, 

 more inwardly on the mesosternum, with a silvery gray line. Legs ; 

 coxa black above, pale ochreous beneath ; fulcra pale ochreous, with 

 a loug black spot in the middle, most perceptible on the 1st pair ; 

 thighs ; 1st pair black with a silvery gloss, the underside brownish- 

 yellow on the apical -J, with a broad black line in the middle ; the 

 basal i clear, pale ochreous ; 2nd and 3rd pairs in length subequal, 

 light brown, paler beneath ; tibiae and tarsi brown, merging into 

 black, those of the hinder legs, together, a little longer than the 



