Taxonomy and biology of European Heptamelini (Hymenoptera, Tenthredinidae, Selandriinae) Author Vikberg, Veli Author Liston, Andrew D. text Zootaxa 2009 2112 1 24 journal article 40965 10.5281/zenodo.187915 6e1d1698-2f3d-4499-af71-bda4588c41a7 1175-5326 187915

TABLE 1. Comparison of characters of diagnostic significance in: 1, the original descriptions of Melicerta Stephens, 1835 and M. ochroleucus Stephens, 1835; 2, the female Stromboceros delicatulus specimen with damaged antennae ex Stephens Collection; 3, male of Heptamelus ochroleucus. Only the male of H. ochroleucus is included in this comparison, because the colour characters described by Stephens preclude the possibility that his description was based on a female of a European Heptamelus species.

Scape and pedicel short. [This is too imprecise to be weighted highly. Possibly only “short” relative to following flagellomeres]	Scape short, only slightly longer than wide. Pedicel approx. 1.5x as long as broad.	Scape and pedicel long, approx. 2x as long as wide.
Antennomere 3 linear.	Antennomere 3 very slightly widened apically.	Antennomere 3 slightly widened apically.
Antennomere 3 nearly as long again as 4.	Antennomere 3 only slightly longer than 4.	Antennomere 3 approx. 2x as long as 4.
Antennomeres 5 and 6 nearly equal in length, slightly shorter than 4.	Antennomeres 5 and 6 nearly equal in length, but together only ca. as long as 4.	Antennomeres 5 and 6 nearly equal in length, slightly shorter than 4.
Clypeus not emarginate.	Clypeus with small but clear emargination.	Clypeus deeply emarginate.
Head slightly produced in front between the eyes.	Head slightly produced in front (frontal ridge and antennal crests).	Head slightly produced in front (whole frontal area, evenly)
3 submarginal cells in forewing.	4 submarginal cells in forewing.	Often apparently 3 submarginal cells in forewing through regularly occurring obsolescence of Rs.
Wings shortish.	Wing length normal.	Wing length normal.
Yellowish white.	Yellowish-white.	Variable: Yellowish-white to pale brown.
Head black. Antennae and labrum ochreous.	Head black. Antennae, labrum and clypeus pale.	Head black. Antennae and labrum pale. Clypeus at least partly pale.
Thorax with 2 abbreviated fuscous streaks in front.	Mesoscutum with 3 fuscous markings (one on each lobe).	At most medial mesoscutal lobe with undivided central black area.
Base of each abdominal tergum except last with broad fuscous fascia.	Only terga 1 and 4–8 with fuscous markings.	Highly variable, but specimens occur with this colour pattern.