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Extracted from: Wallace E. LaBerge. 2001. Revision of the bees of the genus Tetraloniella in the New World (Hymenoptera: Apidae). Illinois Natural History Survey Bulletin 36(3):67–162. This small pale species from the southern
prairies is similar to and perhaps closely
related to albata (Cresson), as its name implies.
Both sexes have the terga covered with
closely decumbent, highly plumose, white pubescence.
The female of paenalbata can be
told from that of albata by the first tergum
having the apical area largely impunctate and
the lower surfaces of the flagellum orange.
The male of paenalbata has a longer first
flagellar segment and darker flagellar segments
as described below. FEMALE. Measurements and Ratios.-
N = 20; length, 10–12 mm; width, 3.5–4.5 mm;
wing length, M = 2.54±0.087 mm; hooks in
hamulus, M = 11.55±0.223; flagellar segment
1/2, M = 2.06±0.033. Integumental Color.- Black with exceptions
as in albata but mandible usually
rufescent in median half, flagellum usually
yellow or orange below except segment 1 dark
brown. Structure.- Head sculpture as in albata
except vertex with flattened lateral area with
punctures extremely minute, separated by 2
to 3 puncture widths or more, shiny. Maxillary
palpal segments 6, ratio about as
1.0:1.0:1.0:0.5:0.3:0.3; galeae dulled by fine
shagreening at tips or in apical half, shiny basally.
Flagellar segment 2 about as long as
broad or slightly shorter, about half as long as
segment 1 and subequal to segment 3, segments
3–9 slightly longer than broad. Mesoscutum sculptured as in eriocarpi and
albata but punctures small, posteromedian
area punctures crowded, surface shiny, finely
shagreened only peripherally. Scutellum similar;
mesepisternum densely punctate, surface
moderately shiny, finely shagreened.
Metasomal tergum 1 sculptured as in albata
but apical area largely impunctate, punctures
restricted to narrow basal area and more
broadly at extreme sides, surface dulled by fine
shagreening. Terga 2–4 similar but basal area
punctures more dense. Pygidial plate with
rounded apex, otherwise V-shaped. Sterna 2–
4 with basal areas densely punctate, narrow
apical areas similarly punctate except
impunctate rims. Vestiture.- Vestiture white except as follows:
vertex and dorsum of thorax often pale
ochraceous, rarely darker; inner surfaces tarsi
golden; tergum 6 golden; sterna golden brown
with small white apicolateral patches on terga
2–4. Scopal hairs long, dense, simple, white. MALE. Measurements and Ratios.- N
= 16; length, 9.5–10.5 mm; width, 3.0–3.5
mm; wing length, M = 2.55±0.165 mm; hooks
in hamulus, M = 10.44±0.223; flagellar segment
2/1, M = 5.03±0.092. Integumental Color.- Integument black
except as follows: clypeus, base of mandible,
and labrum white to pale yellow; clypeus never
infuscated near posterior margin; flagellar segments
2–ll yellow to red below, dark red to
reddish brown above; tegulae hyaline, colorless
to yellow; wing membranes hyaline, colorless,
veins red to reddish brown; terga with
apical areas translucent, almost colorless to
reddish brown with narrow rims colorless;
sterna piceous with apical areas red to reddish
brown with colorless rims; distitarsi red; tibial
spurs pale yellow. Structure.- Head sculptured as in female;
maxillary palpal segments 6, in ratio as
1.0:0.9:0.9:0.6:0.3:0.3; antennae as in albata
but first segment longer, second segment about
five times as long as first. Mesosoma sculptured
as in female but mesonotum often
shinier. Metasomal terga as in female but terga
2–5 with apical areas finely punctate except
in narrow apical rims; tergum 1 with apical
area impunctate as in female. Metasomal
sterna as in female. Pygidial plate with apex truncate, or somewhat rounded, apicolateral
notches evident unless worn, sides tapering
towards truncate apex. Sternum 6 flat, without
apicolateral teeth (Fig. 72); pattern of
vestiture as drawn. Terminalia (Figs. 72–76) similar to
albata. Note sternum 7 (Fig. 73) with
apicomedian plates broad, weakly pointed
apicomedially, vestiture abundant. Gonostylus
and genital capsule as drawn (Figs. 75 and 76). Vestiture.- Color as in albata. Tergal
vestiture as in albata but tergum 1 with apical
area glabrous. Sternal vestiture weak but more
abundant than in albata, especially on sterna
4 and 5; sternum 6 with short relatively sparse
vestiture.
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