The following material taken with permission from: Mitchell, T.B. 1962. Bees of the Eastern United States, Volume II. North Carolina Agricultural Experiment Station. Tech. Bul. No.152, 557 p.
Ericrocis more nearly resembles Xeromelecta than any of the other parasitic Anthophoridae. The species are probably parasitic on Centris, but are of very rare occurrence in the eastern United States. The abdomen is sharply acute at apex, and lacks the pseudopygidial area found in many other parasites. In this it resembles Melecta and Xeromelecta, but differs from both in having a much elongated marginal cell. In the male the abdomen has no pygidial plate, and the mid tibial spurs are blunt apically, to some degree emarginate or bifurcate. In the pubescence these bear a strong resemblance to Xeromelecta, having very similar patterns of pale tomentose bands or spots on the abdominal terga.
FEMALE—Length 11 mm., breadth of abdomen 4 mm.; black, antennae piceous beneath, black above, apical tarsal segments becoming more piceous, mid and hind spurs brownish-testaceous; tegulae yellowish-hyaline, very large, broadly rounded or subtruncate posteriorly; wings pale brownish basally, becoming quite deeply infuscated toward apical margin, veins brownish to piceous; cheeks much narrower than eyes; clypeus quite flat. its median length about half the distance between eyes below; eyes slightly convergent below (fig. 118); mandibles with a slight, inner, subapical angle; basal segment of flagellum slightly shorter than segment 2, median segments very slightly longer than broad; mid tibial spurs deeply incised just before apex; scutellum deeply grooved; punctures over median and lower parts of face and on cheeks fine and close beneath dense pubescence, face and vertex above shining and bare, punctures relatively coarse, deep and sparse, becoming close and fine along margin of vertex; scutum with a deep, median, longitudinal sulcus; punctures of scutellum, and of scutum medially and posteriorly, extremely minute and close, densely crowded, becoming more coarse and distinctly separated toward sides anteriorly; pleura quite coarsely punctate, closely so above, beneath dense pubescence, the lower exposed area with coarse, - irregular punctures that are to some degree separated, interspaces shining; lateral faces of propodeum largely bare and shining, punctures shallow but rather close, obsolescent below; punctures of abdominal terga uniformly microscopic and densely crowded, surface becoming almost tessellate rather than punctate; pygidium rather indefinite, its median length slightly less than basal width, margins subcarinate, surface quite coarsely punctate toward base, becoming smooth and shining apically, apex subacute; median area of face around antennae densely covered with short but copious, whitish or golden pubescence, lower half of face, cheeks, and vertex in part, black pubescent; area below ocelli largely bare, vertex fringed posteriorly with lighter pubescence; upper part of pleura quite densely ochraceous pubescent, and propodeum with an area of dense, elongate, ochraceous pubescence behind wing bases; scutum anteriorly with some brownish pubescence on each side and in median sulcus, these separated by a narrow area of more fuscous pubescence, the posterior two-thirds, axillae and clypeus with very short, subappressed, fuscous tomentum, propodeum medially with some erect, black pubescence; lower portion of pleura with very short, black pubescence which does not obscure surface, and legs largely black pubescent, but tibiae with a basal area of ochraceous ‘pubescence on outer face; basal abdominal tergum broadly yellow tomentose on each side, this area rather broadly rounded and rather widely separated medially; apical impressed areas of terga 2-5 yellow tomentose on each side, these areas widely separated medially but connected by a broad, lateral, continuous band, those on tergum 2 extended for some distance obliquely toward midline; discs of terga otherwise densely black tomentse, contrasting sharply with the yellow tomentose areas; tergum 6 with rather sparse, erect, black bristles.
MALE—Length 12 mm., breadth of abdomen 4 mm.; black, antennae piceous, apical tarsal segments becoming piceous, and mid and hind spurs brownish-piceous; tegulae yellowish-hyaline, very large, broadly rounded posteriorly; wings lightly infuscated basally, becoming quite deeply so apically, veins brownish to piceous; cheeks nearly equal to eyes in width; clypeus rather strongly protuberant, its median length about half the distance between eyes below; eyes slightly convergent below; mandibles rather slender, with a slight, inner, subapical angle; shorter side of basal segment of flagellum subequal to segment 2, median segments about as broad as long; mid tibial spur as in female; scutum with a deep, median sulcus, the scutellum deeply grooved medially; puncturation of head and thorax much as in female; puncturation of abdominal terga 1-4 as in female, but terga 5-7 becoming more coarsely, distinctly and closely punctate; apical margin of tergum 7 slightly incised medially; pubescence of face quite dense and copious but rather short, largely yellow, with an obscure fringe of black hairs on clypeus laterally, labrum entirely black; median length of labrum slightly greater than half the breadth, margin truncate medially; cheeks black pubescent; vertex largely ochraceous pubescent, but with some dark hairs around ocelli and toward upper end of eyes; pubescence of thorax and legs much as in female, but scutellum with a rather 4istinct band of short, ochraceous pubescence on each side; lateral, yellow tomentose areas of basal abdominal tergum narrowly rounded at inner end, nearly meeting; apical impressed areas of terga 2-5 yellow tomentose as in female, but bands less widely separated medially, those or 5 more whitish, discal pubescence very short and black as in female; sterna 7 and 8 and genital armature as shown (fig. 120).
DISTRIBUTION—Southern California to Florida, May or June.