Phrosinella (Euhilarella) pilosifrons Allen, 1926

Phrosinella pilosifrons Allen, 1926: 76 [♂ ♀].

Phrosinella pilosifrons: Criddle, 1927: 47 [faunistic]; Downes, 1965: 938 [catalogue]; Evans, 1966: 35 [habits]; 1970: 465 [habits]; Bohart and Grissell, 1975: 19 [habits]; Spofford et al., 1989: 257 [hosts]; Pape, 1996: 125 [catalogue]; Valenti et al., 1997: 167 [faunistic]; Pickering, 2009: 1722, 1726 [habits].

Holotype (male): USA, Washington, Hood River . Deposited in USNM.

Distribution: Nearctic: Canada (British Columbia, Northwest Territories, Ontario 10); USA (California, Oregon, Washington, Wyoming 11).

Habits: Larvae are specialized kleptoparasites in ground nests of sphecid wasps from the genus Philanthus [ P. barbiger (Evans and O’Neil, 1988), P. crabroniformis (Evans, 1970; Evans and O’Neil, 1988; Pickering, 2009), P. nitens (Evans, 1966, 1970), P. pulcher (Evans, 1970; Evans and O’Neil, 1988), P. zebratus (Evans, 1970; Bohart and Grissell, 1975; Evans and O’Neil, 1988; Pickering, 2009)], where they feed at different freshly killed solitary wasps and bees.