Hydrochasma faciale (Williston 1896)

Hydrochasma faciale (Williston)

Discocerina faciale Williston, 1896:396.

Hydrochasma zernyi Hendel, 1936:103.—Wirth, 1968:8 [synonymy].

Hydrochasma capax Cresson, 1938:26.—Wirth, 1968:8 [synonymy].

Hydrochasma faciale.—Wirth, 1968:8 [generic combination; Neotropical catalog].—Mathis and Edmiston, 1991:825–826 [discussion].

SPECIMENS EXAMINED.—BELIZE. Stann Creek District: Twin Cays (south end of East Island), Mar 1988, W.N. Mathis (1).

DISTRIBUTION.—Nearctic: USA (AZ, CA, TX). Neotropical: Argentina, Belize, Brazil, Ecuador, Guatemala, West Indies (Dominica, Dominican Republic, Puerto Rico, St. Vincent).

DIAGNOSIS.—This species is distinguished from congeners by the following combination of characters: antennal coloration nearly evenly divided between yellowish and dark gray, dorsal and anterior surfaces of pedicel and first flagellomere extensively dark gray; parafacial silvery white, concolorous with facial coloration; forefemur bearing a distinctive, comb-like row of stout setulae along anteroventral surface; tibiae mostly gray; and abdomen lacking wedge-shaped silvery gray areas.

Hydrochasma species

SPECIMENS EXAMINED.—BELIZE. Stann Creek District: Twin Cays (Aanderaa Flats, West Bay), Mar 1988, W.N. Mathis (1, 1).

DIAGNOSIS.—This species is distinguished from congeners by the following combination of characters: antenna mostly dark gray; parafacial silvery white, concolorous with facial coloration; forefemur lacking a distinctive, comb-like row of stout setulae along anteroventral surface; tibiae mostly gray; and abdomen lacking wedge-shaped silvery gray areas.