CERAMBYCID/E 219 



Gaurotes lecontei n. sp. Oblong, convex, glabrous above, very shining, 

 black, the elytra bluish-green; antennae and legs black, the femora broadly- 

 banded with testaceous near the tip; abdomen wholly black; head small, 

 with rather close-set coarse punctures, mingled with smaller ones, the 

 surface smooth anteriorly; antennae, eyes, tempora and prothorax as in 

 cressoni, the first a little more slender; elytra three-fifths longer than wide, 

 feebly cuneiform, fully twice as wide as the prothorax, one-half longer 

 than wide, obtusely rounded behind; punctures sparse, separated by 

 from three to six times their diameters, coarse basally, becoming very 

 minute apically; apices not truncate; under surface shining, minutely 

 punctate, more strongly and rather closely on the sterna, very remotely 

 on the abdomen; mesosternum not protuberant. Length (9 ) 11.5 mm.; 

 width 5.4 mm. Oregon. 



Differs greatly from cressoni in the characters stated, as well as 

 in the black and not bright red abdomen and very much sparser, 

 less coarse and antero-posteriorly more unequal elytral punctures. 



The genus Acmaops, as at present constituted, is even more com- 

 posite than Gaurotes; for, removing bivittata, thoracica and related 

 species from Acm&ops and placing them in that genus, where they 

 evidently belong as stated above, there still remain three generic 

 groups of species definable as follows : 



Front broad, not or scarcely prolonged, the genae short; pronotum never 

 bitumorose; elytra not or rarely at all truncate at tip 2 



Front narrowed and more or less prolonged as in Ophistomis, the genae 

 longer; pronotum generally bitumorose basally, the elytra nearly 

 always sharply sinuato-truncate at tip 3 



2 Body short and broad in form, the antennae shorter and notably 

 thick. [Type Acmccops tnnuda Lee.] Brachysomida 



Body elongate and slender, the antennae long, slender and filiform. 

 [Type Leptura longicornis Kirby.J Leptacmaeops 



3 Body smaller, shorter and relatively broader than in Leptacmaops, 

 the antennae less attenuate. [Type Leptura proteus Kit by]. 



Acmseops 



These three groups differ markedly among themselves in habitus, 

 as well as in special structural features, with no intermediate forms, 

 proving them to have rather the nature of genera than mere sections 

 of a single genus. The only one common to the nearctic and palse- 

 arctic faunas is Acmaops, the species pratensis Laich., with many 

 synonyms, being common to the two continents. Brachysomida is 

 confined to the Pacific fauna of North America, while Acm&ops 

 and Leptacnuzops are purely subarctic, descending to the southward 

 along the Rocky Mountain system. Dinoptera Muls., may be 



