254 NaTuRAL History BULLETIN. 
M. carinatus, Brend. Dark brown, strongly punctured, 
pubescence thin, recumbent. Length, 1.66 mm. Plate VII., 
Figs. 33 ¢, 34 2. 
Flead ¢ broader than long, eyes very prominent, coarsely 
facetted, tempora much convergent, nearly transverse, little 
shorter than the eye. Sides anterior to the eye convergent, 
frontal margin transverse, triangular, antennal tubercles fiat, 
slightly elevated, separated from the median portion of the 
frontal margin by a fine, slightly impressed line, terminating 
posteriorly in small, very deep foveze, which are situated on a 
line with the anterior margins of the eyes and are mutually 
three times farther distant than either is from the eye. The 
median part of the front is plane, not punctured, triangularly 
produced from the antennal tubercles to the middle, where it 
is narrowed into a septum separating the lateral surfaces of 
the clypeus. The plane triangular surface just described 
shows two pairs of deep punctures, one behind the other. 
The region between this and the occiput and between the 
occipital fovez is very strongly elevated, convex, and crowned 
with a sharp longitudinal crest. The head of the 9 differs 
greatly, and shows better the characters exhibited by the 
European Bythinini; the frontal margin between the tubercles 
is slightly convex, not at all triangular, the region between 
the occipital foveze convex, but little elevated, and just visibly 
separated from the anterior portion by an arcuate line. The 
crest is not high, only just visible. The eyes and other parts 
of the body offer no differences. Pa/pz with the first joint 
very small, second half as long as the head, pedunculate- 
clavate, third globular, fourth as long as the second, cultri- 
form, one-fourth as wide as long. Amfenne distant, as long 
as the head and prothorax together, first joint as wide as the 
last palpal joint, nearly one-third of the entire length of the 
antenne. Second globose, as thick as the first, third to eighth 
very small, from globular becoming gradually transverse; 
ninth and tenth lenticular, the tenth three times as wide as 
long, eleventh as long as the three penultimate ones. Near 
