Original description
"Shell subulate, straight, smooth, polished, imperforate. transparent, the axis being plainly visible through the shell; colour white with somewhat irregular and interrupted brownish yellow banding, which starts immediately below the apex; whorls nine to ten, flat with inconspicuous suture; protoconch smooth and yellowish; on the last three, sometimes the last four whorls there are two irregular, much interrupted, often slightly oblique bands of a brownish yellow colour, with some irregular marks of the same colour towards the base of the body whorl; on the upper whorls there is a single, more continuous band, which on the first three or four whorls is practically sutural; aperture narrow, short, pyriform, extremely acute above; columella slightly arcuate. Long.: 4 mm; diam. max. 1,4 mm"

For comparison, a closely related species from Cuba is Hemiliostraca auricincta (Abbott. 1958). It can be distinguished from H. diauges by a slightly higher and wider aperture with straighter outer and inner lip. Hemiliostraca diauges does not live in NW Africa or the Canary Islands. This is the first report of the genus Hemiliostraca from the Eastern Atlantic.

Hemiliostraca diauges (Tomlin & Shackleford, 1915) has a wide distribution along the West African coast from the Cape Verde Islands and the Gulf of Guinea in the north to Angola in the south. The species is not rare as suggested by Tomlin and Shackleford (1915). It is quite common in some material from Sao Tome and the Cape Verde Islands. There are no other species of the Genus Hemiliostraca in material examined from the Eastern Atlantic, and there is no information about the host.