Burmeister 1839:

Ulmer 1905:

translation by Sherlock:
Marilia albicornis Burm.
Tafel I. Fig. 20, 21, 2).
Mystacides albicornis Burm., Handbuch d. Entom. 1839
p. 918.
Leptocerus albicornis Burm., Walker, Catal. Brit. Mus.,
Neur. 1851 p. 69. - Hagen, Amer. Syn. 1861
p. 329. - Hagen, Syn. synon. 1864 p. 827.
The whole body black-brown, feeler reason, tracer and legs yellow-brown, the vorderbeine somewhat more darkly, the hind legs somewhat more brightly, likewise the thighs of the central legs, which are 2 last thirds of the feeler white. Wing very closely behaart, so that the Aderung averages only after distance of the hair a brush becomes clearly visible. Behaarung (dark-redbrown with closed wing, with stretched wing dark-brown; on the Vorderfiilgel some brighter marks, which are yellow-brown behaart and occur approximately in the wing center more near the Hinterrand, are but see I them on the second copy not. Ranciwimpein well develops, brown, much seaweed at the Inneniaiide of the Hinterfluegels. Nervatur s. vorh. and Fig. 20.
Genital appendices of the M (s. Fig. 21 and 22) consists of a pair upper, a pair of lower appendices and the Penis; the lower appendices are more linger and narrower than the upper, and as these are medianwaerts weakly curved, both pairs long behaart.
Burmeister's material (2 M from Brazil), of Beske collected, from the Zool. Institut in resounds had I forwards only. Body
length: 7 mm, length of the forward wing: 9 mm; Feeler length: 24 mm.