240 MEMOIRS ON THE COLEOPTERA 



Group II. 

 Subgenus Acmaeopsilla nov. 



A single very small and slender species of peculiar and extremely 

 constant coloration, alone constitutes this subgenus of Leptacmoeops 

 as follows: 



Body narrow and convex, alutaceous in lustre, black, the head before 

 the antennae, the prothorax and occasionally the tip of the abdomen 

 red; legs black throughout; pubescence anteriorly extremely minute, 

 sparse and scarcely visible, longer, pale and more distinct on the 

 elytra and abdomen, close on the latter; head very densely punctate, 

 with well developed and very convex eyes, the tempora much less 

 prominent, parallel, then rounding to the base, polished and puncture- 

 less as in the basalis group; antennae slender, piceous-black, fully 

 as long as the body; prothorax slightly elongate, narrower than the 

 head, much narrower at apex than at base, broadly rounded at the 

 sides, without trace of apical constriction, the basal broadly im- 

 pressed and distinct; punctures very fine, sparse, the surface evenly 

 and strongly convex throughout; elytra one-half wider than the 

 prothorax and more than three times as long, feebly cuneiform, 

 rounded at apex, the punctures close-set, rather strong basally, fine 

 apically; legs very slender. Length (d 71 9 ) 5-7-6.5 mm.; width 1.7- 

 1.8 mm. California (San Diego). [Acmceops falsa Lee.]. falsa Lee. 



Sexual differences seem to be very slight, the elytra of the male 

 being somewhat more cuneate and narrowly, individually rounded 

 at apex; in the female they are obliquely subtruncate. 



Acmseops Lee. 



The type of this genus as intended by LeConte (Agassiz L. Sup. 

 235), is either Pachyta discoidea Hald., or Leptura proteus Kirby, 

 those species of his Division A being rather Gaurotes than Acmceops, 

 as before stated and typified by Pacyhta thoracica Hald. Acmceops, 

 as here limited, includes small species with moderately elongate, 

 slender antennae and very diversified prothorax, this part in directa 

 being almost a counterpart of that characterizing falsa of the 

 preceding genus, but in all cases the more extended gense and epis- 

 toma produce a narrowed and elongate form of the head before the 

 eyes, which is quite different from anything known in Leptacmceops 

 and remindful of Ophistomis, especially in the extreme form de- 

 veloped in the holsubarctic pratensis. The various groups and 

 specific forms can be noted in the following table: 



