14 EROTYLID^E. 



2. Acropteroxys gracilis. (Tab. I. figg. 18 ; 19, var.) 



Languria gracilis, Newm. Ent. Mag. v. p. 390 x ; Crotch, Trans. Am. Ent. Soc. 1873, p. 351 a ; 



Cist. Ent. i. p. 386 3 . 

 Languria bicolor, Latr. Gen. Ins. et Crust, iii. p. 65, t. 11. f. 11 \ 

 Languria latreillei, Lee. Proc. Ac. Phil. vii. p. 160 5 . 

 Languria nigriceps, Motsch. in Schrenck's Reisen und Porsch. Amur-Lande, p. 242 *. 



Nigro-aeneus, nitidus, capite prothoraceque parce sat distincte punctatis, hoc subtilissime alutaceo, lateribus 

 leviter sinuatis, rufo, vitta mediana basi latiore nigro-senea ; elytris distincte punctato-striatis, striis ad 

 apicem obsoletis ; mesosterno fortiter punctato. Long. 8-11 millim. 



Eab. Noeth America, United States 12345 e_ — Mexico, Ventanas (Forrer), Guana- 

 juato (Edge, SallS), Orizaba, Puebla, Toxpam (Salle), Irapuato, Chilpancingo in Guerrero 

 (Edge); Guatemala, Capetillo (Champion). 



Var. Prothorax rufus, disco vix infuscato. 



Hab. Mexico, Cordova (Edge), Toxpam (Salle); British Honduras, E. Sarstoon 

 (Blancaneaux). 



Var. Prothorax totus nigro-seneus. 



Languria inornata, Randall, Bost. Journ. Nat. Hist. ii. p. 48 \ 



? Languria obscura, Motsch. in Schrenck's Reisen und Porsch. Amur-Lande, p. 243 8 . 



Hab. North America, United States x 2 . — Mexico, Ventanas (Forrer), Cordova 

 (Edge, Salle). 



The numerous synonyms quoted above show that this is a widely distributed and 

 also a variable insect. In the series in our collection all the varieties are included ; 

 but the Mexican specimens have the thorax usually black, or black with only the 

 anterior angles with a red spot ; there are, however, a few specimens with the thorax 

 entirely red, with only a faint trace of a fuscous cloud on the part usually occupied by 

 the vitta. I cannot therefore doubt that these are all varieties of one species, as the 

 punctuation is identical. A single specimen only was met with by Mr. Champion in 

 Guatemala. The punctuation of the mesosternum is a good specific character, but 

 its red colour, mentioned by Crotch, does not hold good in dark specimens. 



DASYDACTYLUS. 



Pedes antici longi (maris femora et tibiae intus asperi, tarsis setosis); tarsi latissimi. Antennarum clava 

 quinque-articulata plerumque brevis. Striola suborbicularis postice divergens, brevis. Prothorax 

 oblongo-quadratus ; maris convexus, antice latior. Prosternum leviter arcuatum, apice truncato vel exciso, 

 marginatum, interdum utrinque bifoveolatum. Elytrorum apicibus denticulis sex vel septem armatis, 

 rotnndatis vel truncatis. 



This genus has some features in common with the type of Goniolanguria, and indeed 

 one species, D. thoracieus, would come under Crotch's definition of that genus, for a 

 minute carina for stridulating appears on the crown of the head ; but in more essential 

 characters the species here brought together have a natural unity of structure which the 

 type of Goniolanguria has not in common with them. Indeed the species which forms 

 that type is, so far as I have seen, " sui generis." 



