116 U. S. NATIONAL MUSEUM BULLETIN 2 09 



forewing of most species give the appearance of the node and gaster 

 of the Formicidae, and when seen running on trunks or twigs indi- 

 viduals of these species look very much like specimens of Camponotus. 

 The two subgenera are easily distinguished. 



Key to the subgenera of Dipogon 



1. Second cubital cell about as long as the third (pi. 1, fig. 9); maxillary beard of 



female brown to blackish Deuteragenia (p. 116) 



Second cubital cell about 1.3 as long as the third (pi. 1, fig. 10); maxillary beard 

 of female white to stramineous Dipogon (p. 131) 



Subgenus Deuteragenia Sustera 



Agenia Schi0dte, 1837, Kr0yer's Naturhistorisk Tidsskrift, vol. 1, p. 321 (pre- 

 occupied). Type: /Sp/iex fonegraio Linnaeus; designated by Westwood, 1840. 



Anoplius Lepeletier, 1845, Histoire naturelle des insectes, hym^noptferes, vol. 3, 

 p. 440 (preoccupied). Type: {Anoplius variegatus Linden) = variegatus 

 Linnaeus; designated by Pate, 1946. 



Pogonius Dahlbom, 1845, Hymenoptera Europaea, vol. 1, p. 453 (preoccupied). 

 Type: Sphex variegata Linnaeus; designated by Pate, 1946. 



Deuteragenia Sustera, 1913, Verh. zool.-bot. Ges. Wien, vol. 72, p. 191 (new name 

 for Agenia Schi0dte). 



Forewing 4.5 to 10 mm. long: maxillary beard of female brown to 

 blackish; second cubital cell about as long as the third cubital cell 

 (pi. 1, fig. 9). 



This subgenus is largely Holarctic in distribution, but is represented 

 also in the Neotropics. It contains the larger species of the genus. 

 There are two species groups, as indicated in the keys and the group 

 descriptions. 



Keys to the Nearctic species of the subgenus Deuteragenia 



MALES 



(The males of nubifer, duplicatus, thoracicus, iracundus, sericeus, and 



nigrior are unknown.) 



1. Cubital vein not reaching the wing margin (pi. 2, figs. 26, 27); radial vein not 

 more strongly angled at its juncture with the second intercubital vein than 

 at its juncture with the third intercubital vein; hooks on sixth sternite short 

 and pointed backward; subgenital plate bulbous basally, with a long apical 



point. PULCHRIPENNIS GROUP 2 



Cubital vein reaching the wing margin (pi. 1, fig. 9; pi. 2, fig. 28); radial vein 

 distinctly more strongly angled at its juncture with the second intercubital 

 vein than at its juncture with the third intercubital vein; hooks on sixth 

 sternite long and incurved; subgenital plate with a median longitudinal keel 

 which is highest subbasally. variegatus group 5 



