150 MEMOIRS ON THE COLEOPTERA. 



the sinuses at apex broad but evident; abdomen a little narrower than the 

 elytra, gradually and very feebly tapering and with broadly arcuate sides 

 throughout. Length 2.3 mm.; width 0.57 mm. Canada (Ottawa), Car- 

 rington. 



This species is the only one here described which is really closely 

 allied to the European fungi, and it does resemble it to a great 

 degree; on close observation, however, it is readily perceived to 

 differ in its paler, much more slender and less distally incrassate 

 antennae, with longer first and third joints, in its larger and more 

 transverse head, less transverse prothorax and less abbreviated 

 elytra. 



Acrotona renoica n. sp. Rather stout and convex, shining, the punc- 

 tures fine, somewhat close-set, dense, stronger and asperate on the elytra; 

 color dark piceous-brown, the head and abdomen black, the elytra not paler 

 than the prothorax, the legs very pale brownish-flavate ; head strongly 

 transverse, the eyes well developed, at less than their own length from the 

 base, the parallel tempora scarcely at all swollen; antennae rather long, very 

 slender, just visibly incrassate, pale brownish, becoming gradually pale tes- 

 taceous basally, the first joint much longer and stouter than the second, the 

 latter only very little longer than the third, the fourth decidedly elongate, 

 the tenth very nearly as long as wide, the last pointed and as long as the two 

 preceding; prothorax large but only moderately transverse, subparallel 

 and strongly rounded at the sides, the truncate apex distinctly narrower than 

 the strongly rounded base, much wider than the head and evidently wider 

 than any part of the elytra, with a rounded and feeble, sometimes evanescent 

 basal impression; elytra subparallel, not very short, the suture barely per- 

 ceptibly longer than the prothorax, the apical sinuses broad but rather deep; 

 abdomen at base only slightly narrower than the elytra, gradually and feebly 

 tapering and with feebly arcuate sides throughout. Length 2.0 mm.; 

 width 0.5 mm. Nevada (Reno). 



Distinguishable at once from fungi by the relatively much larger 

 head and prothorax and shorter elytra, as well as by the less in- 

 crassate antennas. 



Acrotona ardelio n. sp. Much narrower and more parallel, smaller and 

 darker than the preceding, piceous-black, the elytra not paler, the head and 

 abdomen black, the legs pale brownish-flavate; surface shining, the punc- 

 tuation and vestiture nearly as in renoica and others; head well developed, 

 transverse, evidently inflated at base, the tempora a little shorter than the 

 eyes; antennae nearly as in the preceding, pale but still paler basally, slender, 

 only just visibly incrassate, the second joint decidedly longer than the third, 

 the fourth less elongate, the outer joints nearly similar; prothorax large, 

 transverse, inflated and strongly rounded at the sides, moderately narrowed 

 at apex and broadly rounded at base, much wider than the head and distinctly 

 wider than any part of the elytra, the rounded basal impression small and 



