Clypeus almost entirely densely and evenly punctate with only extreme lower margin impunctate
. Ovipositor short and robust (Fig.
The similarity of Tyronella to impunctate
orthide brachiopods such as Toxorthis (Temple 1968) has been discussed by Rong (1984).
The other subdivision represented by nigriventris, brunnescens, basalis and minor appear to be neatly held together by the synapomorphies i.e., puncturing distinctly darker and scutellum narrow with fine impunctate
Hind angles strongly divergent, slightly recurved apically; dorsal carina shallowly arcuate, reaching 0.2X distance to pronotal anterior margin; deplanate laterad of dorsal carina, margin slightly reflexed, interim area impunctate
Thorax nearly impunctate
, shiny; pubescence yellow, shorter than that on head.
2A); collar only slightly bulged; scutellum flattened, without outgrowths or rows of punctures laterally; pronotum and scutellum impunctate
; posterior part of metepimeron roundish; metasternum without medial outgrowth; corium flat, without swellings; hemelytra without row of punctures on clavus and R + M vein, clothed with distinct suberect setae; R + M vein almost reaching apex of corium; inner margin of clavus slightly concave claval commissure longer than; inner margin of corium behind clavus straight; forecoxae removed from each other; foretibia distinctly shorter than head and pronotum combined; femora slightly widened apically, not curved; tarsal segment I 1.5 times as long as segment II and slightly longer than segment III (Fig.
Head smooth, impunctate
, eyes relatively small, postocular distance at least twice as long as eye length.
Scutellum: Medial swelling well elevated, impunctate
. Thoracic pleura: shiny, covered with moderately dense punctation and with long vestiture; peritreme rather obtuse, matte.
Mesoscutum nearly impunctate
, pubescence similar to that on vertex.
, only moderately convex, reddish.
Head: malar space less than quarter the width of base of mandible; clypeus with median apical rim and adjacent subapical area without distinct punctures, apical third of clypeus shallowly but distinctly impressed, sides of clypeus with 3 convergent striae composed of a few large elongate punctures separated by narrow impunctate
shining interstriae; facial fovea deep and wide above, extending to level halfway up lateral ocelli, upper margins of foveae sharply margined, not evenly intergrading with occiput, apically wider than antennal width at second flagellar segment.