16 



U.S. NATIONAL MUSEUM BULLETIN 2 68 



Male, — Length 13 mm. Body black with creamy white markings, 

 legs largely ferruginous; punctation average; pubescence average. 



Head subequal in width to thorax, black except for a large lateral 

 eye patch, the clypeus and an elongate patch between the antennal 

 scrobes, all of which are creamy white; clypeal border with three 

 sabequal black denticles; mandibles without denticles, ferruginous 

 with darker apices; antennae black. 



Thorax black except the pronotum, a small patch on the posterior 

 lobe of the pronotum, band on the scutellum, the metanotum, large 

 patches on the propodeum, a triangular patch on the pleuron and 

 a small patch on the tegulae, all of which are creamy white; tegulae 

 low and smooth; enclosure smooth except for a medial groove and 





Figure 4. Central Mexico, E. atrata, 

 new species 



1 ^SL-^., 



evanescent grooves basad; mesosternal tubercles absent; legs fer- 

 ruginous except for a small creamy white spot on each of the fore 

 and mid femori and the basal parts of all legs which are dark fuscous 

 to black; wings subhyaline with a clouded area on the anterior part 

 apically. 



Abdomen black except for a broad band constricted medially on 

 tergum 1, a broad band deeply emarginate on tergum 2, narrow bands 

 widening laterally on terga 3, 4, and 5, emarginate band on tergum 

 6, broken band on sternum 2, band on sternum 3 and lateral patches 

 on sternum 4, all of which are creamy white; prominent rows of 

 bristles on sterna 3 and 4, a shorter row of short appressed bristles 

 on sternum 5 ; pygidium as illustrated (fig, 62f ) . 



Types. — The 9 type and 6^ allotype were taken 17 mi. NE. 

 of San Luis Potosl, S,L,P,, Mexico, Sept, 6, 1963, at 6,200 ft, elev. 



