Hylaeus rugulosusIslands: Hawaii
Locations: Hawaii - (Kipuka Nene, KMC, Napau Trail, Puu Koli, Puu Puai, PTA, Redleg Trail, Saddle)
Habitats: Montane wet forest
Plants: Dodonaea, Metrosideros, Myoporum
Xerces: No info.
Insects of Hawaii: Medium-sized bees with smoky wings and basal area of propodeum reticulately rugose to brow. Male black and unmarked except pale area on fore tibia; supraclypeal area much wider than long, large shiny area above antennal sockets; scape moderately dilated even at base; gonoforceps uniquely truncate at apex. Female black and unmarked; with unique mandible straight across at apex, as wide or wider at apex than at articulation.
This species has been rarely collected, but a large series was recently collected around a stone structure, apparently a nesting site. As pointed out by Snelling (1975), the Nearctic species often known as Hylaeus rugulosus (now regarded as a synonym of H. modestus citrinifrons) is correctly spelled H. rugosulus (Cockerell, 1896).
Insects of Hawaii Volume 17
UH/DOD: This enigmatic species appears to have no close relatives and had been known from only two recent collections, both in Hawaii Volcanoes National Park (Daly and Magnacca 2003). Consequently, although it was known to be rare it was not considered a target species since it was thought to occur only outside the primary survey area. However, during the course of this project it was found across a broad area of the north slope of Mauna Loa in the saddle with Mauna Kea (Figure 10). Collections came from Metrosideros polymorpha, Myoporum sandwicense, and Dodonaea viscosa. Although still uncommon, it was the only species other than the common H. difficilis to be found widely in time as well, being found in April, July, and November.
Hylaeus near military lands