The dominant characters are the presence of swimming tufts on dorsal abdominal segments
, the peripheral lobes and interspiracular processes which are well developed on the posterior disc, and the very long setae of the sensilla, including long setae of the Keilin organs.
Mature (third instar) agabine larvae have spiracles on pleural regions of the mesothorax and abdominal segments
1-7 and head lengths of 1.
During an examination of museum specimens from the Field Museum of Natural History (Chicago, IL, USA) and New Zealand Arthropod Collection (Auckland, New Zealand), we noticed 3 distinct morpho-types within the supertribe Faronitae (Coleoptera: Staphylinidae: Pselaphinae) possessing enlarged abdominal segments
VI, a character that has previously been used to characterize genus boundaries (Park & Carlton 2013, 2014).
Total length (tl), abdominal length (al), width of second abdominal segment
width of third abdominal segment
(wts), length of cercopods (lc), number of setae inserted on left cercopod (nlc), number of setae inserted on right cercopod (nrc), width of head (wh), maximal distance between compound eyes (dby), diameter for compound eyes (dy), length of first antenna (la), width of frontal knob (jk) and abdomen length : total length ratio (ra, %).
Three caudal abdominal segments
of male were removed, then was placed in KOH 10% at 20 to 30 min and washed with distilled water and placed in ethanol 96% for dehydration.
In the fifth instar, the tubercles on abdominal segments
II and III are lost, probably due to the development of the wing pads; and the costal margin of wing pads becomes more armed, probably by translocation, as suggested by Stusak & Stys (1959).
Apex of fore wing reaching third abdominal segment
; hind wing reaching third abdominal segment
VII simple, produced neither dorsally or ventrally; terminalia strongly protruding, bill-shaped, formed by a composite dorsal plate and a pair of lateroventral plates.
Body spindle-shaped, widest at or near the first abdominal segment
, approximately 18 mm in length (alcohol preserved specimens), excluding urogomphi; sclerotized areas pale yellowish-brown.
00; hemelytral membrane in the macropterous form almost reaching apex of last abdominal segment
, in brachypterous form reaching posterior border of abdominal segment
III or anterior border of IV; femora not granulate, sparsely clothed with semidecumbent, silvery, bristle-like setae; maximum width of abdomen wider than 4.
1A), on the mouthparts, ventrally at the union of the cranium and prothorax, and on the seventh abdominal segment
The Orthenches group is similar to Plutellidae in larval and pupal characteristics but differs from the latter in having the male gnathos narrowly fused with the tegumen laterally, and the larval setal group SV unisetose, not bisetose, on the abdominal segment
IX (Dugdale 1996).
Hemelytra: Macropterous; hemelytral membrane almost reaching apex of last abdominal segment
Mature larvae of Nearctic Rhantus have been described as having cerci (urogomphi) that are as long as or longer than the last (eighth) abdominal segment
2C); basi- and distiflagellomeres long and thin, tip of antenna reaching abdominal segment