Length, 11 to 12 mm. Male. Front pale cinereous pollinose the parafrontal hair black; third antennal joint narrowly reddish below; basal aristal joint slightly longer than broad, the second elongate. Pleura yellow pilose. Three posterior acrosticals. Abdomen shining black, the sides usually very broadly castaneous, the apical segment pale brassy yellowish pruinose; rather broad apex of first and base of second segments cinereous pollinose. Second abdominal seqment with strong marginals. Fifth sternite simple, with moderately strong apical bristles. Ridges of posterior forceps moderately high, flattened, hairy on inner and outer surfaces, the apex as in figure 28; the outer forceps are as in A. plangens n. sp. (see figure 27).