132 MEMOIRS ON THE COLEOPTERA. 



length to the pro thorax; abdomen at base almost as wide as the elytra, 

 gradually and just visibly tapering throughout; tergites short, the fifth 

 longer than the fourth, the sixth in the type broad and feebly arcuate at 

 apex. Length 1.8 mm.; width 0.45-0.5 mm. Iowa (Keokuk and Iowa 

 City) and Arizona (Williams). 



Recognizable by the sombre color, coarse reticulation, short 

 elytra, form of the head and the unusually coarsely faceted eyes. 

 There seem to be no striking male sexual characters. 



Synaptina consonens n. sp.- father less broad and somewhat more paral- 

 lel, similar in color, in its shining lustre, minute, sparse punctures and very 

 coarse micro-reticulation, which is strikingly coarse on the abdomen, the 

 pubescence coarse and sparse; head nearly similar, feebly swollen basally, 

 convex, the rather prominent eyes similar and coarsely faceted, the fine 

 carinse generally extending but slightly beyond the middle, the antennae 

 similar but rather shorter, paler basally, the second joint evidently shorter 

 than the first and a little longer than the third, the outer joints rather strongly 

 transverse and the last shorter than the two preceding; prothorax similar, 

 convex and shining but with a distinct impression along the median line 

 basally; elytra much less transverse, the apical sinuses still feebler, the 

 suture nearly a third longer than the prothorax; abdomen a little narrower 

 than the elytra, more parallel, scarcely at all tapering even apically, other- 

 wise similar in structure. Length 1.75 mm.; width 0.42 mm. Rhode 

 Island (Boston Neck), New York (near the city) and Iowa (Keokuk and 

 Cedar Rapids). 



Readily distinguishable from the preceding by its very much 

 less abbreviated elytra. Sexual characters are indistinct, but the 

 sixth ventral seems to be more trapezoidal in some examples. 



Synaptina quaesita n. sp. Larger, rather convex, somewhat less shining, 

 the reticulation much finer and normal, that of the abdomen moderately coarse 

 and very uneven, except apically on each tergite, where it becomes finer and 

 transverse, the punctures fine, asperulate and rather close-set, also close and 

 asperulate on the abdomen except apically, the pubescence rather abundant; 

 color black, the elytra rather pale castaneous, the legs pale brown; head 

 wider than long, the eyes larger, more rounded and finely faceted, somewhat 

 convex and at their own length from the base, the tempora feebly arcuate 

 and only scarcely visibly more prominent than the eyes, the carinse subob- 

 solete and not entire; antennae dark, slightly paler basally, only moderately 

 short, gradually rather strongly incrassate, the second joint scarcely longer 

 than the third but much shorter than the first, the outer joints rather strongly 

 transverse, the last pointed from behind the middle to the tip and longer 

 than the two preceding; prothorax formed as in the two preceding but more 

 distinctly wider than the head, slightly narrower than the elytral base, not 

 impressed along the median line but with a small transverse basal impression ; 

 elytra rather strongly transverse, evidently though broadly sinuate at the 

 apices externally, the outer side unusually projecting posteriorly, the suture 



