Stigmella assimilella (Zeller, 1848) Fletcher et al., 1945

Male. Wingspan: 5.4-6.2 mm.  Head: frontal tuft ochreous,  sometimes mixed with brown; collar and scape yellowish white; antenna half  length of forewing, fuscous.  Thorax black, tips of tegulae and mesoscutum  white.  Forewing: coarsely scaled, brownish black with three whitish spots;  one round spot at one third and two opposite, triangular spots at two thirds  from wing base; terminal cilia pale yellowish, grey at tornus.  Hindwing  and cilia grey.  Abdomen dark grey with short grey-brown anal tufts. Female.   Wingspan: 5.7-6.3 mm.  Antenna slightly shorter than half  length of forewing.  Forewing black with more contrasting white spots and  cilia.  Abdomen fuscous with short dark grey brown anal tufts. Male genitalia. Vinculum tapering anteriorly with  shallow to moderately deep emargination.  Uncus subtriangular with square  medial emargination and small but distinct paramedial notches.  Gnathos  with close-set, diverging horns on well sclerotized basal plate.  Valva  divided into long, pointed distal process and right to acute angled inner lobe.  Transtilla with short, broad transverse bar and short, blunt sublateral processes.  Aedeagus almost as long as genital capsule with 5-6 unilaterally sclerotized  cornuti and a cluster of 10-15 sharply pointed spines, a few of which are  longer and distinctly curved. Female genitalia. Corpus bursae with band of scallop-shaped  chitin plates surrounded by sparse and indistinct pectinations; posterior  part narrow, strongly folded.  Ductus spermathecae without spines.  Apophyses posteriores slender and slightly longer than anteriores.  Ovipositor  not protruding, tip blunt.