Comprehensive DescriptionRead full entry
Head. Ivory band on the anterior marign of crown absent or fragmented. Antennal flagellum regular, tapering to final diameter in basal third. Antennal ledges in dorsal view not protruding.
Thorax. Anterior part of pronotum with a pair of conspicuous lateral yellow or orange spots or group of spots. Anepisternum distinctly yellow. Lateral black maculae on mesonotum distinct, solid, or with only small light marking centrally (or entire mesonotum mostly black).
Wings. Forewing uniformly shiny black, pitted. Apical cells of forewing dark coriaceous. R vein bordering the first anteapical cell black. Brochosome spots on female forewings (present only during egg-laying in some species) present (often seen as residual traces) or absent or unknown.
Legs. Posterior surfaces of mesofemur and metafemur brown to black. Anterior surface of metatibia with short hairs immediately dorsally of anteroventral macrosetal row. Anteroventral row of macrosetae on female metatibia conspicuously elongate and curved compared to male.
Abdomen. Red area on caudal abdominal terga absent (yellow pattern can be present).
Male Genitalia. Subgenital plate with light and dark pattern or uniformly black. Lateral process of aedeagus in lateral view extending dorsad, more or less straight. Caudal process of aedeagus in lateral view longer than half aedeagal shaft, but not reaching apex. Lateral process of aedeagus in caudal view gradually curved inwards. Caudal process of aedeagus in caudal view thickest at the base, gradually narrowing towards apex. Apices of caudal processes of aedeagus in caudal view diverging. Bases of caudal processes of aedeagus in caudal view fused. Pair of lateral dentiform processes on aedeagal shaft in caudal view absent. Male pygofer lobes dorsocaudally rounded. Sensilla on inner surface of pygofer dorsocaudally present. Apex of aedeagal shaft in caudal view membranous along midline.
Female Genitalia. Female sternum VIII consists of two plates, not connected or with narrow or broken bridge in between. Sclerotized plates of sternum VIII broader than long or circular. Lateral margin of sclerotized plates of sternum VIII notched or lobed in posterior 2/3 or entire. Anterolateral fold of sclerotized plates of sternum VIII absent or membranous, incospicuous. Posterior margin of sternum VIII without hemispherical bulge medially. Sclerotized plates of sternum VIII not narrowed anteriorly. Sclerotized plates of sternum VIII diverging posteriorly. Inner posterior angle of each sclerotized plate of sternum VIII not produced. Sclerotized plates anteriorly close together.
Distribution. Alaska, Western Canada or Rocky Mountains states or Eastern U.S., E. Canada.