58 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



Front wings with a moderate sized stigma, an incomplete marginal 

 and two basal cells, tbe discoidal cells obliterated; the basal cells are 

 abont equal in length, the first oblique at apex, the second rounded or 

 somewhat angulate. 



Abdomen ovate, subpetiolate, segments 2 and 3 the longest; the 

 apical margins of the segments are entire. 



Legs stout, the femora much swollen, especially the anterior pair, 

 claws often with a tooth towards the base. 



This genus might easily be mistaken for forms in Calyoza^ MesitiuSj 

 and Isohrachium. The much swollen fore femora separate it from Iso- 

 hrachinm; the transverse fovea or grooved line at the base of the scu- 

 tullum from Mesitius ; while thebilobed maxilla separates it from Caly- 

 oza; but when one is in doubt, or until one becomes familiar with the 

 habitus of the genus, the full generic description must be consulted. 



It is quite well represented in our fauua and no doubt many new 

 species will be discovered when the rroctotrypidw are more carefully 

 collected. 



The species at jiresent known to me may be thus tabulated : 



TABLE OF SPECIES. 



FEMALES. 



Cox£e and legs rufous or pale rufous 2 



Coxte black. 

 Legs rufous, the femora more or less fuscous or dusky. 

 Wiugs subliyaliue. 



Head and thorax neueous-black ; metathorax with 5 longitudinal raised lines 



with transverse lines between E. occidentalis, sp. nov. 



Legs and antennte rufous. 

 Wings subfuscous. 

 Head and thorax opaque black, very finely, closely punctulate; metathorax 

 with a central raised line, the surface on each side being reticulate 

 with raised lines, <? E. carbonarius, sp. nov. 



2. Head black, not at all metallic 3 



Head itneous, abdomen bluish. 



Wings fuscous E. yENEiCEPS, sp. nov. 



3. Front coxa- black ; antenuiu and legs rufous. 



Wings subfuscous. 

 Metathorax with many longitudinal raised lines and irregular crossliues be- 

 tween ; apex of abdomen rufous E. analis Cr. 



All cox;p and legs rufous or honey-yellow. 

 Wiugs subhyaliue. 



Head not unusually large or broad. 

 Metathorax with (5 or 8 raised longitudinal lines. 

 Head and thorax black. 



Mesoplcnr.'i foveatod ; ma)idihlc8 '>-dentate E. rufipes, Say. 



Mesopleuraareolated; mandibles C-deuiaie E. columbianus, sp. nov. 



Head and thorax with a bluish tinge, or submetallic. ..E. gkandis, Ashm. 

 Head very large and broad E. MEGACEPHAErs, sp. nov. 



