410 MR. A. MURRAY’S MONOGRAPH OF THE FAMILY OF NITIDULARLA. 
sloping posteriorly to the exterior apical angles; apex truncate, but with both the 
exterior and sutural angles rounded, the former broadly rounded. 
From Senegal. I have only seen one specimen in the Berlin Museum, and one in 
Dejean’s collection in the possession of the Marquis de la Ferté. 
2. ECNOMUEUS CONCAVUS. 
Erichs. in Germ. Zeitschr. v. 438 (1844). 
Testaceus, nitidus, subtiliter pubescens, thoracis concavi elytrorumque margine elevato. 
Long. 3} lin. 
Habitat in * Christmas Bay." 
Testaceous, shining, finely pubescent ; the thorax concave, with its margin raised; the 
elytra also with a raised margin. 
Distinguished from Æ. planus by its lighter colour, by its shining through the pubes- 
cence, which is finer and somewhat longer on the upper side, by its breadth behind the 
wide concave thorax, and by the strongly raised margins of the thorax and elytra, as 
well as by the longer elytra. Below, the abdomen has a longer pubescence at the apex 
on each side. 
From Christmas Bay. In the Berlin Museum. 
3. Ecnomaus SCAPHULA. 
Erichs. in Germ. Zeitschr. v. 438 (1844). 
Testaceus, subnitidus, subtiliter pubescens ; thorace brevissimo, coleopterisque leviter con- 
cavis, his margine laterali elevato. Long. 2 lin. 
Habitat in Nubia. 
Testaceous, somewhat shining, finely pubescent, with the thorax very short, the elytra 
slightly concave and with the lateral margin raised. 
Nearly allied to F. concavus (perhaps merely a variety), but only half its size. The 
thorax is proportionally broader and shorter and the elytra less shining. 
From Nubia. There is a unique specimen in the Berlin Museum. 
Genus M sTROPSs. 
Erichs. in Germ. Zeitschr. iv. 234 (1843). 
Lacordaire, Hist. Ins. Col. ii. 294 (1837). 
Othonea (Dej. in litt.). 
Caput sine sulcis antennariis. Labrum bilobum. Abdomen segmentis subzqualibus, segmentulo anali 
in utrovis sexu nullo, segmentis duobus ultimis expositis. Antennz in maribus plerumque longi- 
ores, 
Head without antennal grooves. Antenne of different proportions in different species, 
and in most species of different length in the sexes, longest in the males; the club is 
oval or rounded and compressed. Labrum rather large, bilobed. Mandibles projecting, 
stout, flat, rounded on the outside, simple and sharp at the tip. Lobes of the maxille 
