body length = 13mm, Benson (1938) reports female body length 11-14mm

shows bulge at anterior border of T7 - Benson (1938) lists this as a diagnostic character separating Pterygophorus from Lophyrotoma

anterior yellow band confined to tergum 3 dorsally

posterior yellow band confined dorsally to a narrow bulge at the anterior border of tergum 7

anterior yellow band extends laterally on tergum 3, crossing into anterior half of tergum 4 in its lateral region

posterior yellow band extends ventrally, expanding to posterior edge of tergum 7 and crossing into tergum 8

anterior yellow band expands into sternum 3, making a complete band around segment 3

posterior yellow band expands to ventral border of tergum 7 and 8

tergum 10, pygidium is also yellow

anterior yellow band expands into sternum 3, making a complete band around segment 3

posterior yellow band expands to ventral border of tergum 7 and 8

anterior yellow band expands onto sternum 3, making a complete band around segment 3

posterior yellow band expands to ventral border of tergum 7 and 8 - left side

posterior yellow band expands to ventral border of tergum 7 and 8 - left side

posterior yellow band expands to ventral border of tergum 7 and 8 - right side

terminal segment, tergum 10 (pygidium) is yellow

extended saw visible

view of tergum 10, pygidium

shows saw extended from sheath

arrow shows tooth #10

43 denticulations present on this tooth - Benson (1938) reports 28-40 denticulations present in P. cinctus

from Benson (1938) fig. 6

scape and pedicel black/dark brown

8 basal antennomeres yellow

remaining 13 apical antennomeres black

most apical antennomere is clubbed

total 23 antennomeres. antenna length = 0.4 length of forewing

scape black, pedicel dark yellowish-brown

8 basal flagellomeres yellow. pecten directed antero-ventrally on each flagellomere, becoming longer in apical flagellomeres.

shows eyes converging in front so that length of eye is about equal to distance between eyes in front - Benson (1938) fig. 1

apex of clypeus emarginate (vs. truncate, separating P. cinctus from P. distinctus according to Morice, 1919)

diagnostic characters of Pterygophorus vs. Lophyrotoma (according to Benson, 1938)

distance between eyes in front subequal to (1.1x) length of eye (vs. at most 2/3)

breadth of clypeus 2/3 length of eye (vs. about equal)

breadth of clypeus at 2/3 length of eye (vs. as long as)

black; short, fine pale pubescence; shining, impunctate

ligula same length as 3 basal segments of labial palp

labium 1.1x greatest breadth of clypeus

malar space (arrowed) = 0.42 breadth of mandible at base (arrowed) (vs. more than 0.5 in P. insignis and P. facielonga according to Benson, 1938)

pronotum, mesoscutellum and metascutellum pale yellow and shiny between sparse punctures; mesoscutum black

thorax covered by short, fine, pale pubescence

short, fine, pale pubescence over thorax

accessory furrow on pronotum (arrowed) subparallel with side-margin of pronotum - diagnostic feature separating Pterygophorus from Lophyrotoma spp. except for L. zonalis and L. cygna

pronotum colour yellow with black anterior border and black behind accessory furrow

mesepisternum black with large central yellow area

side portion of pronotum cut off by accessory furrow broader than length of malar space (vs. about half length of malar space) - separates P. cinctus, P. distinctus, P. insignis and P. facielonga from P. turneri

shows accessory furrow on pronotum - Benson (1938) fig. 5

ventral view of mesepisternum showing large yellow patch and short, fine, pale pubescence

costa and stigma yellowish-brown

hyaline with dark brown band extending along anterior border to wing apex, covering 1st discoidal, 1st cubital and radial cells completely and half of 2nd and 3rd cubital cells

venation black in basal and anterior region, brown in apical region

coxa, trochanter, femur - all legs black

tibia - all legs black except for whitish-yellow on ventral side of basal 1/3rd

tarsi - all legs black except for whitish-yellow on dorsal side of basal 1/3rd of all tarsomeres

costa and stigma yellowish-brown

hyaline with dark brown band extending along anterior border to wing apex, covering 1st discoidal, 1st cubital and radial cells completely and half of 2nd and 3rd cubital cells

venation black in basal and anterior region, brown in apical region

hind leg removed showing black colour in all parts of all segments except for whitish-yellow on ventral side of basal half of tibia and on dorsal side of basal 1/3rd of all tarsomeres

hind basitarsus no longer than following tarsal segment