Synonyms and other taxonomic changes
Philanthus bilunatus Cresson 1865
Philanthus scelestus, Philanthus assimilis, Philanthus consimilis, Anthophilus bilunatus, Anthophilus scelestus, Philanthus bilunatum (Strickland 1947 Alberta).
Smooth metasoma, crescent-shaped yellow spots on tergum 2.
Head: Black. Long, thin yellow mark behind eyes, sometimes absent. Lower face yellow. Female has small spot above antenna bases, males have a large spot. Mandibles yellow with black tips.
Antenna: Scape yellow with a black stripe. Segments black. Males sometimes have 1st and/or 2nd segment yellow on underside.
Thorax: Collar has yellow stripe, broken at center. A yellow bar across thorax. Thorax side has yellow tubercle.
Wings: Wing knob (tegula) blackish, but sometimes with a yellow spot at front on both male and female. Wings slightly tinted reddish.
Abdomen: Black, shiny. Small yellow dot on each side of segment 1, may be faint or absent. Segment 2 has pair of wide, inverted U-shaped yellow marks. Segments 3 to 5 or 6 have narrow yellow stripes, with U-shaped indents (emarginate) at each side of center.
Northern U.S. and eastern Canada.
Sandy, flat locations and sand dunes.
July and August in Ontario; June to September in norther U.S.
Larvae feed on Sweat Bees Hylaeus ligatus, Hylaeus confusus, Lasioglossum leucozonium, Augochlorella aurata.
Females nest in sand and form 3 to 4 cells per nest. Each cell contains 7 to 8 small bees. Females sleep in nest, closing entrance from the inside.
Lectotype as Philanthus bilunatus male by Cresson, 1865. Type Locality: Illinois. In Academy of Natural Sciences of Philadelphia, Drexel University, Philadelphia, Pennsylvania. Type #1986. Lectotype designated by Cresson, 1916.
Lectotype as Philanthus scelestus female by Cresson, 1880. Type Locality: Colorado. In Academy of Natural Sciences of Philadelphia, Drexel University, Philadelphia, Pennsylvania. Lectotype designated by Cresson, 1916.
Syntypes as Philanthus assimilis males by Banks, 1915. Type Localities: New York, Boston. In the Museum of Comparative Zoology, Harvard, Cambridge, Massachusetts.
Similar Species: Philanthus lepidus stripes on abdominal segment 2 reach to top of segment and do not curve downward at middle of segment i.e. not U-shaped. Usually solid stripes on 3 to 5 can be wavy, but have no obvious U-shaped indents (emarginate) on stripes like Philanthus bilunatus.
Proceedings of the Entomological Society of Philadelphia, 1865, Vol. 5 by Cresson, pg. 97.
Transactions of the American Entomological Society, 1878, Vol. 7 by Cresson, pg. xxxiii (near end of journal).
Entomological News, 1897, Vol. 8 by Dunning, pg. 70.
Bulletin of the American Museum of Natural History, 1913, Vol. 32, #23 by Banks, pg. 422.
The Canadian Entomologist, 1915, Vol. 47 by Banks, pp. 404-405.
Connecticut Geological Natural History Survey, 1916 #22: Guide to the Insects of Connecticut Part III: The Hymenoptera or Wasp-like Insects of Connecticut by Viereck, et al., pp. 673 to 675.
The Canadian Entomologist, 1923, Vol. 55 by Banks, pg. 21.
Proceedings of the Entomological Society of Washington, 1968, Vol. 70 #1 by Lin, pp. 11-12.