1868. 



137 



apicali sub-rhomboidali,fuseo-marginata ; pedihus testaoeis, tihiis anticis 



Uneis maculisque fuscis, necnon ante medium dente longo inst^^uctis. 



Long. G lin. 



Linear, subcylindric, pale yellowisli-brown. 



Head— divided into two almost equal portions by a deep curved channel between 

 the eyes ; viewed from above the anterior portion has its Bides parallel, the 

 posterior portion somewhat arcuate and tapering towards the thorax, with a 

 very narrow central line and a broader one on each side extending almost to 

 the posterior margin ; viewed from the side ovate, sub-rhomboidal, with a fus- 

 cous line throughout its entire length, interrupted by the eye. Antennos very 

 long, filiform, pale fuscous. Eyes small but prominent, shining, deep pitchy- 

 black. 



Thorax— Pronotum — anterior margin concave, produced on the sides, side margins 

 constricted towards and at the collar j disc with a fine brownish-red central 

 Hue extending over the collar. Mesonofum — sides divergent, with a distinct 

 margin widest at the apex. Scutellum minute, basal angles rounded. Elytra 

 a little more than one-half the length of the abdomen, nervures strong ; base, 

 anterior and interior margins as far as the nerve, pale yellowish and somewhat 

 shagreened ; disc whitish, almost diaphanous, shining, somewhat iridescent, 

 with a row of fuscous spots next the inner marginal nerve, and one or two 

 spots, parallel with the other row, nearer the middle of the disc ; longitudinal 

 nerves on the inside and the nerve at the apex enclosing a rhomboidal cell, 

 margined on both sides with fuscous. Sternum yellowish-brown, more or less 

 mottled with fuscous-brown. Legs pale yellowish-brown. Thighs — 1st pair 

 on the outside with large, irregular, fuscous-brown patches. Tibice with ir- 

 regular, diagonal, fuscous-brown streaks and spots more or less confluent, 1st 

 pair on the under-side before the middle with a long tooth, and between it and 

 the apex a double row of short teeth, with, at intervals of about every fifth 

 tooth, a longer one, the shoi-t teeth entirely and the apex of the others blaok. 

 Tarsi with a brown band at the apex. Claw readies to the long tooth, apical 

 half pitchy-brown. Tarsi of the 2nd and 3rd pairs at the apex and the claws 

 piceous. 



Abdomen — above fuscous-yellow, with a narrow red central line and one down each 

 side next the connexivum, between the central and side lines an interrupted 

 fuscous line, penultimate segment sHghtly green ; underneath fuscous-brown, 

 clothed with minute yellow hairs, central line pale, corinexivum margin pale 

 brownish-yellow, base and apex of the segments, and five or six oblong spots 

 of various sizes, placed at irregular inteiwals, fuscous-brown, at the junctions 

 of the segments a small, round, shining, fuscous wart. 



We have much pleasure in naming this insect after Dr. A. Dohrn, 

 the author of the admirable monograph of the Family, which was pub- 

 lished in the Linnaea Entomologica, vol. xiv. 



The description has been drawn up from a single specimen, taken 

 in April amongst water weeds on the edge of the stream running from 

 Elisha's Fountain. 



