20 U.S. NATIONAL MUSEUM BULLETIN 2 68 



two lateral denticles, below this ridge there is a medial cluster of 

 bristles, below these bristles there is a broad extension of the clypeal 

 border the lateral angles of which appear as distinct denticles, sur- 

 face of the clypeal medial lobe slightly convex; mandibles with a 

 single bicuspidate (cusps appear as one in some specimens) denticle 

 which is low and with a broad base; antennae immaculate, normal 

 in form. 



Thorax black except for a divided band on the pronotum, a band 

 on the scutellum, a band on the metanotum, oval spots on the en- 

 closure, patches on the propodeum, small spots on the tegulae and 

 small spots on the pleuron, all of which are creamy white; tegulae 

 low and smooth; enclosure with a deep medial groove, lightly ridged 

 at about 45° with its base and with a pair of oval spots variable in 

 size; mesosternal tubercle absent; legs black except for traces of 



Figure 6. Baja California. E. haja ScuUen 



creamy white on the tarsal segments; wings subhyaline with the 

 anterior part clouded, second submarginal cell not petiolate. 



Abdomen black except for a divided band on tergum 1, emarginate 

 bands on terga 2, 3, 4, and 5; venter immaculate; pygidium with 

 sides very slightly convex and converging to a rounded apical tip. 



Male, — ^Length 9 mm. Black with creamy white markings; punc- 

 tation somewhat less crowded than average; pubescence sparse and 

 very short. 



Head sHghtly wider than the thorax, black except for the face 

 and an elongate patch on the genae bordering the eye, both of which 

 are creamy white; narrow black stripes extend from the antennal 

 scrobes to connect by an evanescent line with the black of the vertex; 

 base of mandibles, patch on the scape and basal segments of the 

 flagellum creamy white; clypeal border with three blunt denticles 

 on the medial lobe, the medial denticle the smallest; mandibles 

 without denticles but Avith a slightly elevated carina; antennae 

 normal in form. 



