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Triepeolus concavus (Cresson, 1878)
Epeolus concavus Cresson, 1878

Life   Insecta   Hymenoptera   Apoidea   Apidae   Triepeolus
Subgenus: None

Triepeolus concavus, concave cuckoo bee
© Copyright John Ascher, 2006-2014 · 11
Triepeolus concavus, concave cuckoo bee

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Triepeolus concavus, concave cuckoo bee
© Copyright John Ascher, 2006-2014 · 9
Triepeolus concavus, concave cuckoo bee
Triepeolus concavus FEM mm - f
© Copyright Laurence Packer 2014 · 7
Triepeolus concavus FEM mm - f

Triepeolus concavus MALE CF
© Copyright Laurence Packer 2014 · 7
Triepeolus concavus MALE CF
Triepeolus concavus, concave cuckoo bee
© Copyright John Ascher, 2006-2014 · 7
Triepeolus concavus, concave cuckoo bee

Triepeolus concavus, M, back, Dorchester Co, MD
© Copyright source/photographer · 5
Triepeolus concavus, M, back, Dorchester Co, MD
Triepeolus concavus, M, face, Dorchester Co, MD
© Copyright source/photographer · 5
Triepeolus concavus, M, face, Dorchester Co, MD

Triepeolus concavus, M, side, Dorchester Co, MD
© Copyright source/photographer · 5
Triepeolus concavus, M, side, Dorchester Co, MD
Triepeolus concavus, f, back, Pennington Co, South Dakota
© Copyright source/photographer · 5
Triepeolus concavus, f, back, Pennington Co, South Dakota

Triepeolus concavus, f, face, Pennington Co, South Dakota
© Copyright source/photographer · 5
Triepeolus concavus, f, face, Pennington Co, South Dakota
Triepeolus concavus, f, side, Pennington Co, South Dakota
© Copyright source/photographer · 5
Triepeolus concavus, f, side, Pennington Co, South Dakota

Triepeolus concavus, female, ps area lateral
© Molly Rightmyer · 1
Triepeolus concavus, female, ps area lateral
Triepeolus concavus, female, ps area
© Molly Rightmyer · 1
Triepeolus concavus, female, ps area

Triepeolus concavus, female, dorsum
© Molly Rightmyer · 1
Triepeolus concavus, female, dorsum
Triepeolus concavus, female, terga
© Molly Rightmyer · 1
Triepeolus concavus, female, terga
Overview
Reprinted with permission from: Rightmyer, M.G. A Review of the Cleptoparasitic Bee Genus Triepeolus (Hymenoptera: Apidae)

TRIEPEOLUS CONCAVUS (CRESSON)

(Frontispiece, Figs. 35–38, 263) Epeolus concavus Cresson 1878: 85 [Lectotype: Academy of Natural Sciences No. 2241; female, California]; Brues 1903: 80 [illustration of female T5 and S5]; Cresson 1916: 115 [designation of lectotype].

Triepeolus concavus; Robertson 1901: 231; Linsley and Michener 1939: plates xv, xviii [illustration of female S6, anterior wing]; Mitchell 1962: 464–465, Figs. 111, 112 [redescription, floral records, illustrations of male genitalia, scutellum, axillae]; Bohart 1970: Fig. 19 [photograph of egg in cell wall of host]; Hurd et al. 1980: 28, 90, 91 [habitus illustration, visitation records for Helianthus species]; Rozen 1989b: 15, Figs. 24, 25 [description, illustrations of first instar].

Triepeolus concava; Minckley et al. 1994: 1415.

Description.—Length ca. 10–16 mm; ITW 2.2–3.1 mm. Integument entirely black or dark brown, except often ferruginous apically on mandibles, basolaterally on labrum, and laterally on F1; dorsum of mesosoma and metasoma with bands of yellow setae. Clypeus with weak midline and distinct larger punctures (partially obscured in specimens with brown/black setae on clypeus, especially males). Paramedian band indistinct from dense yellow setae covering anterior third to fourth of mesoscutum. Scutellum strongly to moderately bigibbous; axillar spine triangular, reaching midpoint of scutellum. Mesepisternum lacking erect, simple setae; with distinct region of yellow, branched setae on dorsal third to fourth; remainder black, covered with minute, contiguous punctures and black or dark brown, branched setae. T1 discal patch strongly rectangular to subovate (very reduced in some specimens from Arizona); T2 completely covered with pale yellow setae except for semicircular to trapezoidal basal black region. Female: Pseudopygidial area with long, stout setae forming posterior “plate”; S5 strongly downcurved; ventral meso- and metasomata entirely dark brown. Male: Pygidial plate relatively wide, with distinct basal transverse ridge; metasomal sterna with setae dark brown except sometimes with white setae laterally on S3; S3 with apical setae slightly surpassing apical margin; S4–S5 with dark brown apical fringes.

Comments.—Males of T. concavus might be mistaken for those of T. remigatus; however, in T. remigatus the paramedian bands and yellow setae on the anterior margin of the mesoscutum form a strong anchor pattern, while in T. concavus the paramedian bands are not distinct from the region of dense yellow setae on the anterior third or fourth of the mesoscutum. Males might also be mistaken for those of T. nevadensis; however, in T. concavus the metasomal sterna usually lack white setae, while in T. nevadensis there is an apical band of white setae on S3. Also, the clypeus of T. nevadensis is shining, with distinct larger punctures, while that of T. concavus is relatively matte, and covered with setae, thus partly obscuring the larger punctures. The mesoscutum is shinier in T. nevadensis (with punctures separated by up to one puncture diameter) and the scutellum is somewhat flattened and extended posteriorly; in T. concavus the mesoscutum is matte (with punctures nearly contiguous) and the scutellum is bigibbous, not extended posteriorly.

Distribution.—USA: Alabama, Arizona, Arkansas, California (the Central Valley, and extending further south into San Bernardino Co. and Riverside Co.), Colorado, Florida, Georgia, Idaho, Illinois, Indiana, Kansas, Louisiana, Michigan, Minnesota, Mississippi, Missouri, New Mexico, North Carolina, Oklahoma, Texas, Utah, Washington, Washington D.C., Wisconsin.

Host Records.—Svastra (Epimelissodes) obliqua (Say) (Custer 1928, observations of adults entering nests, larvae in cells; Bohart 1970, egg in cell; Rozen 1989b, larva from nest).

Floral Records.—Helenium sp., Helianthus annuus L., H. tuberosus L., Heliopsis helianthoides (L.) Sweet, Lepandena marginata (= Euphorbia marginata Pursh), Prionopsis ciliata (= Grindelia papposa Nesom & Suh), Ratibida pinnata (Vent.) Barnh., Verbesina sp., Vernonia baldwinii Torr., “star thistle” (= Centaurea).

Seasonal Records.—4 June to 21 October.

Specimens examined.—193 female, 53 male (AUSTIN, BOULDER, CORVALLIS, DAVIS, GAINESVILLE, ITHACA, LAWRENCE, LOGAN, LOS ANGELES, NEW YORK, PHILADELPHIA, RIVERSIDE, STARKVILLE, TUCSON, URBANA, WASHINGTON D.C.).

Reprinted with permission from: Mitchell, T.B. 1962 Bees of the Eastern United States. North Carolina Agricultural Experiment Station Technical Bulletin No. 152.

FEMALE—Length 16 mm.; black, including tegulae and legs, antennal flagellum more piceous beneath, the basal segment dull ferruginous; space separating lateral ocelli from margin of vertex about equal to their diameter; cheeks about half width of eyes, somewhat narrower below, posterior margin cannate; median length of labrum about two- thirds the breadth; hind margin of scutellum quite strongly outcurved but with a broad and deep median impression, free part of axillae short, reaching slightly beyond mid- transverse line of scutellum (fig. 112); wings fuliginous, with the usual three submarginal cells, veins piceous; face below antennae largely bare, with short, erect, largely dark hairs above, pubescence of legs and ventral portion of thorax entirely black and largely appressed where evident; pronotum, tubercles, adjacent dorsal area of pleura, anterior half of scutum, a narrow line in scutello-mesothoracic suture, upper portion of posterior face of propodeum, metanotum and adjacent margin of scutellum covered with dense, appressed, yellow tomentum; basal abdominal tergum almost entirely yellow tomentose above, with a very small, median area and anterior face black, apical rim very narrowly black; tergum 2 yellow tomentose except for a semicircular, median, basal, black area, the rim narrowly black; tergum 3 with a broad transverse band of yellow tomentum that occupies nearly the entire plate on each side, but is broadly in- curved, basal half medially black tomentose; tergum 4 black tomentose basally, with a relatively narrow, transverse, yellow tomentose band, the narrow rim black; tergum 5 quite strongly narrowed apically, the pseudopygidium forming the abruptly truncate tip, disc of plate somewhat shining, with rather coarse and sparse punctures, these becoming extremely minute and densely crowded laterally and basally; sternum 5 somewhat protuberant beyond tip of tergum, lower surface broadly concave; pleura, scutellum and axillae densely and finely punctate, scutum with somewhat more distinct and slightly coarser but very close punctures posteriorly, clypeus and lower part of face doubly punctate, with scattered, rather coarse but shallow punctures on a minutely, densely punctate field; outer surface of front and hind tibiae quite coarsely tuberculate.

MALE—Answers in general to description of female; sterna 4 and 5 with apical fringes of robust, black, apically curved bristles; pygidial plate strongly elevated above disc of tergum 7, rather elongate, narrowly rounded apically, margin carinate, with a median transverse ridge beyond which the surface is quite smooth, the more basal area very densely and minutely punctate and with fine, subappressed pubescence.

DISTRIBUTION—In the East, Wisconsin and Illinois to North Carolina and Florida; June to September.

FLOWER RECORDS—Cosmos and Helenium. This is recorded by Robertson (1929) on Bidens, Blephilia, Brauneria, Cephalanthus, Cirsium, Coreopsis, Helianthus, Heliopsis, Lepachys, Lespedeza, Liatris, Lythrum, Monarda, Nepeta, Petalostemum, Pycnanthemum, Silphium, Teucrium, Verbena and Vernonia.

HOST—Svastra obliqua.


Names
Scientific source:

Supported by

Hosts · map
FamilyScientific name @ source (records)
Asteraceae  Helianthus annuus @ BBSL (1); I_JSA (3)
Verbenaceae  Verbena sp @ BBSL (1)
_  Asteraceae sp_( @ BBSL (1)

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Updated: 2024-03-29 12:05:26 gmt
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