254 Natural History Bulletin. 



M. CARiNATUS, Brend. Dark brown, strongly punctured, 

 pubescence thin, recumbent. Length, 1.66 mm. Plate VII., 



Figs. 33 I. 34 ?• 



Head I 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 flat, 

 slightly elevated, separated from the median portion of the 

 frontal margin by a tine, slightly impressed line, terminating 

 posteriorly in small, very deep fove£e, 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 foveee is very strongly elevated, convex, and crowned 

 with a sharp longitudinal crest. The head of the ? 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 fovege convex, but little elevated, and just visibly 

 separated from the anterior portion by an arcuate line. The 

 crest is not high, onh^ just visible. The eyes and other parts 

 of the body offer no differences. Palj>i 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. AntemicB distant, as long 

 as the head and prothorax together, first joint as wide as the 

 last palpal joint, nearlv one-third of the entire length of the 

 antennae. 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 



