ODYNERUS. 363 



beneath, and strongly notched beyond the middle, on their anterior 

 face ; the notch almost forming three-quarters of a circle ; its 

 angles quite sharp, dentiform. Posterior tibiae strongly dilated, 

 somewhat as in the Melliferae, terminated very widely ; the inner 

 angle forming almost a process. 



Bess. a. cliff. — This insect has quite the appearance of Ptero- 

 chilus aztecus, but it differs by its small and not feathery labial 

 palpi. 



Hab. Mexico. I caught but one specimen in the Cordillera 

 of Coscomotepec. 



Division EPIPONUS (propria dicta). 



Mandibles of the males having beyond the middle a large notch, 

 followed by a tooth or spur. Antennae elongate, thick; 

 their extremity curled up into a spiral. Clypeus Z wider 

 than long, very strongly bidentate. — The second recurrent 

 nerve of the anterior wing falling upon the 2d transverso- 

 cubital nerve, or very near it. 



The true Epiponusseem to be peculiar to the temperate and 

 northern parts of the southern hemisphere ; they are abundant in 

 Europe, rare in America; in the lower latitudes they give place 

 to the Antepiponus,\i\\\ch, with the same appearance, approach 

 more nearly to the true Odynerus. 



In regard to the distinction of the species one must notice that, 

 contrary to the usual case, in this group it is not the female, but 

 the male, which offers the most distinctive characters. 



Beside the subgeneric characters, peculiar to the total number 

 of the males, there are others specially belonging to a part of the 

 species ; some have the coxae or intermediate femora indented ; 

 others have the clypeus curiously shaped. But the females are 

 far from being so well characterized, and the distribution of the 

 colors must be strongly relied upon in distinguishing the species. 



156. E. dilectus Sauss. (Fig. 29, 29a.) — Niger, punctatus, fusco- 

 hirsutus ; frontis macula, puncto post-oculari, tibiis, tarsis abdorninisque 

 segmentorum limbo, sulfureis; ultimis segmentis tantum fascia abbre- 

 viata fiava; alis subhyaliiiis, tegulis fusco et flavo maculatis. — % . Cly- 

 peo flavo, valde bidentato, ore et antennis subtus flavis ; femoribus in- 

 termediis tridentatis. 



Odyn. dilectus Sauss. Revue de Zool., XXII, 1870, 141, 34, %. 

 % . Total length, 9 mm. ; wing, 8 mm. 



