210 S. FRANK AARON. 



Colors always metallic and shining, extending upon the scape and 

 sometimes one or two of the following antennal joints and upon the 

 femora and tibia?. Articles of the antennas beyond the scape to the 

 apex, and also the tarsi, dull brown, the latter sometimes luteous. Head, 

 thorax and abdomen covered, or partly covered, with more or less dis- 

 tinct punctures, which are generally largest upon the metathorax, and 

 becofning large, shallow, foveolse on each side of the metanotum. Scape, 

 tegulae and the femora and tibiae with generally fine indications of the 

 punctures ; three distinct ocelli ; antennae with thirteen articles ; tarsi 

 with five articles, the basal one long, the others very short, subequal ; 

 wings hyaline, generally more or less tinted with dark colors ; mesothorax 

 with two longitudinal sutures dividing it into three equal parts ; poste- 

 riorly on each side of the metanotum a produced, pointed, triangular 

 spine, in a few specimens these are only indicated by obtuse angles. 

 When the tergum is bent the extreme base of the second and third seg- 

 ments expose black or purple colors. 



No doubt but that exception will be taken to the manner in which I 

 have separated and amalgamated genera and species, but I have in every 

 instance endeavored to reconcile the inferences drawn with the principles 

 of natural classification. 



The detailed figures illustrate the important described difierences in 

 the forms. For this purpose a powerful but large magnifying glass was 

 used, and great care was exerted to render them accurate. 



Sub-Families. 



Face entirely convex. Prothorax as long, or longer than wide, and longer than 

 the mesothorax, with a distinct arched suture crossing its anterior portion. 

 Metanotum almost equally elevated with the other portions, giving the 

 dorsum of the thorax the appearance from above of four distinct parts 

 except the prothorax. Abdomen convex beneath, the lateral margins 

 not extending beyond the surface of the venter. Segments of the tergum 

 4 and 5 Clepliiise. 



Face more or less concave (a receptacle for the scape or long basal joint of the an- 

 tennse). Prothorax much wider than long, suboblong, always shorter 

 than the mesothorax. Metanotum beneath the postscutellum at an angle 

 90°, giving the dorsum of the thorax the ajipearance from above of 3 

 distinct parts, excepting the prothorax. Abdomen concave beneath, 

 caused by the lateral margins extending beyond the surface of the venter. 

 Segments of the tergum 3, except in the % of Parnopes, which has 4. 

 " Maxilla; and labium ordinary, ligula subconical" (not produced) "exterior 

 process of maxillae rounded, obtuse." [Dahlbom.] 

 Third abdominal segment without submarginal groove, declivity, or series of 

 pits interrupting the evenness of its entire surface. Discoidal cellule 

 wanting, or formed only by dark colored indications of the nervures. 



Elampinse. 



