Characteristics
Procerosoma Lonsdale & Marshall is a rare neotropical genus known from one female (P. prominens Lonsdale & Marshall) collected in Mexico, and one male and one female collected in Brazil (P. alini (Shatalkin)) (Lonsdale & Marshall, 2006a). The translation of the generic name is 'slender-bodied', referring to the relatively long, thin thorax and legs, which are characteristic of the genus. Aside from the elongate, gracile body, Procerosoma is defined by an inclinate anterior fronto-orbital bristle, an open cell bm (shared with Sobarocephala), one pair of stripes on the face and scutum, a reduction of the mid fronto-orbital bristle, and an absence of the ocellar, postvertical, acrostichal and dorsal preapical tibial bristles (Lonsdale & Marshall, 2006a).

Internally, the male genitalia of Procerosoma are characterized by a small pregonite (also shared with Sobarocephala), stout bristles on the postgonite and a basiphallus that is heavily setulose laterally. The female genitalia are very simple and closely resemble those of Sobarocephala.

Biology
The only known male in the genus (Procerosoma alini) has a wide head (wider than the thorax) with a pair of elongate genal 'antlers' that terminate in a bright white bulb. These structures are probably associated with head-measuring competitions and male agonistic behaviour like that recorded in a number of other clusiid genera. Some Neotropical species of Hendelia Czerny have similar conspicuous modifications of the male head.

North American species: None.