152 MEMOIRS ON THE COLEOPTERA 



attains the sides, and each elytron is very much more obtusely 

 rounded at tip. The elytra are more elongate in aztecana. 



*Acropteroxys pertenuis n. sp. Very slender, deep greenish-black 

 through every part of the body, legs and antennae, polished, the pronotum 

 just visibly alutaceous; head finely, very remotely punctate, less sparsely 

 toward the sides anteriorly, the eyes large and prominent; antennae 

 but little longer than the prothorax, slender, the 5-jointed club gradually 

 broader from the base, the seventh joint longer than wide, the eighth a 

 third wider and slightly wider than long; prothorax much elongated, 

 nearly one-half longer than wide, equal in width to the head, parallel, the 

 sides nearly straight, feebly everted basally, the basal angles acute, the 

 base broadly bisinuate, the impressed line along the base not attaining 

 the sides; surface remotely and very minutely punctate, with a rather 

 broad impunctate axial area not attaining base or apex, the strioles 

 minute and obsolescent; scutellum broadly angulate, moderately trans- 

 verse; elytra four times as long as wide, at the rather narrowly rounded 

 humeri only slightly wider than the prothorax, the sides just visibly 

 converging to near apical fifth, where they become moderately oblique 

 to the narrow apex, each tip very narrowly rounded; punctures deep and 

 perforate, almost half as wide as the intervals, rather close-set in regular 

 unimpressed series, smaller but still very distinct posteriorly, though 

 wanting at the apex as usual; intervals each with a widely spaced series 

 of excessively minute punctules; last ventral distinctly but not densely 

 punctate. Length 6.3 mm.; width 0.95 mm. Mexico (Puente de Ixtla, 

 Morelos) , Wickham. 



There is no species closely allied to this that I am able to find in 

 the literature of the genus; it is the most slender Languriid known 

 to me at present. 



Of those Erotylids following the Languriinae, the Dacnids seem 

 to be placed at the head in the works of Mr. Gorham, but toward 

 the last of the series in the arrangement followed by Kuhnt in his 

 systematic catalogue of the Erotylidae. 



Dacne Latr. 



Several authors, among whom are Thomson, Fairmaire, Chapuis 

 and Horn, have used the name Engis Payk., for the species of this 

 genus, instead of Dacne Latr., which is older by some four years, as 

 subsequently noted by Crotch. The species of Dacne are rather 

 numerous; they are small, elongate-oval or suboblong, with widely 

 separated coxae, slender tarsi and compact 3-jointed antennal club, 

 the joints of which are very strongly transverse. The eight in my 

 collection at present may be known as follows: 



