18 



U.S. NATIONAL MUSEUM BULLETIN 2 68 



Abdomen black except for a divided band on tergiim 1, narrow 

 solid bands on the apical half of terga 2, 3, 4, and 5, all of which are 

 creamy white; venter immaculate; pygidium with a broad base, sides 

 slightly convex and converging to a slender but rounded apex. 



Male. — ^Length 9 to 10 mm. Black with creamy white markings 

 except for some leg parts which are fuliginous; punctation average; 

 pubescence short. 



Head subequal in width to the thorax; black except for elongate 

 frontal eye patches which are medially emarginate, most of the 

 medial clypeal lobe, large triangular patches on the lateral lobes, 

 an elongate area between the antennal scrobes, a round spot back 

 of the eye and a patch on the base of the mandible, all of which are 



'Z '"'^_ 1<f-C l/ Figure 5. Central Mexico. E. haccharidis, new species 



/" 





creamy white; clypeal border with three black denticles on the medial 

 lobe, the medial one the largest; hair lobes indistinct; mandibles 

 without denticles; antennae black and normal in form. 



Thorax colored as for the female; tegulae low and smooth; enclo- 

 sure as in the female; mesosternal tubercles absent; legs colored 

 as in the female; wing colors and venation as for the female. 



Abdomen colored dorsally as on the female; venter with solid 

 creamy white bands on sterna 3 and 4, sternum 5 with minute spots 

 laterally; pygidium as illustrated (fig. 63f). 



Both sexes of this species closely resemble E. vittatifrons Cresson 

 in size, colors, color pattern and wing venation. The females, how- 

 ever, differ in the structure of the clypeal borders and the oval white 

 patches on the first and second pair of femora of E. haccharidis. The 

 males may usually be separated by the oval patches on the fore and 

 mid femora of the latter species. 



