32.1 Lipusidae: Chimabachinae

1	Males 2

-	Females (reduced wings) 4


2 (1)	Labial palpus with segment 2 covered with very long hairs, concealing terminal segment Dasystoma salicella (part, male)
	17.0-20.5mm. Mid March to mid April. Forewing dark brown with two pale ochreous fasciae and whitish ochreous apical suffusion.
-	Labial palpus with segment 2 covered with rough hairs and scales, not concealing terminal segment 3


3 (2)	Flagellum evenly ciliated (length cilia equal to diameter flagellum) Diurnea fagella (part, male)
	21.5-28.0mm. Early March to early May. Forewing whitish or ochreous white; indistinct and incomplete angulated blackish fascia at one-third, often a similar subterminal line, blackish stigmata. Melanic forms are common and have grey or blackish forewings with whitish fascia at one-fourth and black stigmata.
-	Flagellum with long fascicles of cilia (length cilia four times diameter of flagellum) D. lipsiella (part, male)
	19.5-25.0mm. Early October to early December. Forewing ochreous brown, variably and indistinctly marked, e.g. with pale or dark shades from base, whitish sprinkling at middle of costa and in disc beyond middle, dark stigmata or a dark shade in distal area.

4 (1)	Smaller species, 6.0-10.0mm. Forewing less than half as long as abdomen Dasystoma salicella (part, female)
	Mid March to mid April. Forewing greyish white with two blackish fasciae. Hindwing very small, occasionally absent.
-	Larger species, 15.0-20.0mm. Forewing somewhat longer than abdomen 5


5 (4)	Labial palpus with length four times eye-diameter Diurnea fagella (part, female)
	15.0-20.0mm. Early March to early May. Colour and pattern of forewing similar to male (couplet 3), also melanic forms similar to male.
-	Labial palpus with length two times eye-diameter D. lipsiella (part, female)
	15.0-18.0mm. Early October to early December. Forewing greyish white with longitudinal black streaks.