1	A. RS of forewing not reaching wing margin; small specimens usually under 2 mm	2
–	B. RS of forewing reaching wing margin; specimens usually longer than 2 mm	3
2 (1)	A. First two metasomal terga sculptured; Nearctic	Paradelius
–	B. First two metasomal terga not or only weakly sculptured; widespread	Adelius
3(1)	A. Metasomal carapace with two traverse depressions on	4
–	B. Metasomal carapace without two traverse depressions	10
4(3)	A. Forewing crossvein cu-a and vein M meeting or almost so; occipital carina incomplete dorsally; Chile, rare.	Leptochelonus
–	B. Forewing crossvein cu-a originating far distal to M; occipital carina complete dorsally; widespread, common.	5
5(4)	A. Antenna with 23 antennal articles, including scape (S) and pedicel (P). AA. 1RS+M vein well distant from vein M and intersecting parastigma (PS)	6
–	B. Antenna with more than 23 antennal articles including scape (S) and pedicel (P). BB. 1RS+M vein intersecting vein M or parastigma (PS) very close to vein M	8
6(5)	A. Clypeus without teeth or rounded protuberances; Neotropical, rare	Phanerotomoides
–	B. Clypeus with two or more teeth or rounded protuberances; widespread, common	7
7(6)	A. Metasomal carapace decurved apically and covering all segments; widespread, common.	Phanerotoma
–	B. Metasomal carapace relatively flat apically and not covering all segments; Neotropical, rare	Huseyinia
8(5)	A. Clypeus ca. as long as wide and without teeth or rounded protuberances; Neotropical, rare.	Furcidentia
–	B. Clypeus distinctly wider than long and with teeth or rounded protuberances (the latter sometimes very weak)	9
9(8)	A. Latero-posterior margin of carapace with two large teeth; Neotropical; rare	Dentigaster
–	B. Latero-posterior margin of carapace without pair of large teeth; widespread; relatively common	Pseudophanerotoma
10(3)	A. Forewing 1-SR+M absent	Chelonus
–	B. Forewing 1-SR+M present	11
11(10)	A. Ocelli forming an isosceles triangle	Ascogaster
–	B. Ocelli forming an equilateral triangle	Leptodrepana