4. Malar space about 1.2x as long as basal width of mandible; head strongly elongate in frontal profile. Flagellum gradually thickened apically. Occipital carina absent on ventral 0.4 of head (southwestern USA: Arizona and California).

4’. Malar space ≤ 0.8x as long as basal width of mandible. Flagellum of uniform diameter. Occipital carina complete or nearly so (absent only on ventral 0.2 of head).