REVISION OF GENUS EUCERCERIS CRESSON 61 



Head slightly wider than the thorax, ferruginous with a narrow- 

 darker patch bordering the eyes near the vertex and the apices of 

 the mandibles and mandibular denticles which are dark fuscous 

 (some specimens of females show dark stripes passing through the 

 antennal scrobes fusing with a similar dark area embodying the 

 ocelli) ; the following parts are yellow^ : large lateral eye patches, an 

 elongate patch betw^een the antennal scrobes, the entire clypeus 

 except the border denticles and an evanescent patch back of the 

 eyes; clypeal border with fom- subequal denticles, the medial pair 

 of denticles connected by a concave lamella-like structure, a con- 

 caved area between the lateral and the medial denticles, and a small 

 cluster of bristles just above the medial pair of denticles; a low cone- 

 shaped elevation appears on the surface of each lateral lobe of the 

 clypeus; a small but distinct cone-shaped elevation with a truncate 

 apex appears on the frons just above the epistomal suture; mandibles 



Figure 38. Western Mexico. E. sonorae, new species 



with one prominent acute denticle; antennae normal in form, fer- 

 ruginous basally, becoming darker apically. 



Thorax ferruginous infused with variable amounts of fuscous; 

 yellow markings as follows: band on the pronotum extending onto 

 the posterior lobe, evanescent lateral spots on the scutellum, the 

 metanotum, angular patches on the pleuron, small patches on the 

 tegulae, evanescent small spots on the enclosure, and large patches 

 on the propodeum; tegulae low and smooth; enclosure smooth except 

 for a medial groove and short ridges extending laterally from the 

 meson; mesosternal tubercles small and acute but very distinct; 

 legs ferruginous; wings subhyahne wdth the anterior area clouded; 

 stigma and more basad border golden; second submarginal cell 

 petiolate. 



Abdomen ferruginous except for the depressed areas on terga 

 2, 3, and 4, and the followang parts which are yellow: a broad band 

 on terga 1 and 5, broad bands embodying the dark depressed areas on 



