«. 137 
icali sub-rhomhoidali,fusco-marginata ; pedibus testaoeis, tibiis anticis 
leis maculisque fuscis, necnon ante medium dente longo instruct is. 
Long. 6 lin. 
Linear, subcylindric, pale yellowisli-brown. 
'.ad — divided into two almost equal portions by a deep curved channel between 
the eyes ; viewed from above the anterior portion has its sides 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. Anteniue very 
long, filiform, pale fuscous. Eyes small but prominent, shining, deep pitchy- 
black. 
orax—Pronotum — anterior margin concave, produced on the sides, side margins 
constricted towards and at the collar ; disc with a fine brownish-red central 
line extending over the collar. Mesonotum — sides divergent, with a distinct 
margin widest at the apex. Seutellum 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 ceU, 
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. Tibiee with ir- 
regular, diagonal, fuscous-brown streaks and spots more or less confluent, Ist 
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 short teeth entirely and the apex of the others black. 
Tarsi with a brown band at the apex. Claw reaches to the long tooth, apical 
half pitchy-brown. Tarsi of the 2nd and 3rd pairs at the apex and the claws 
piceous. 
\domen — 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 slightly green ; underneath fuscous-brown, 
clothed with minute yellow hairs, central line pale, connexivum mai'gin pale 
brownish-yellow, base and apex of the segments, and five or six oblong spots 
of various sizes, placed at irregular intervals, fuscous-brown, at the junctions 
of the segments a small, round, shining, fuscous wart. 
We have mucli pleasure iu naming this insect after Dr. A, Dohrn, 
e author of the admirable monograph of the Family, which was pub- 
hed in the Linnaea Entomologica, vol. xiv. 
The description has been drawn up from a single specimen, taken 
April amongst water weeds ou the edge of the stream running from 
isha s Fountain. 
