Antennae moderate or elongated, straight, slender, the club nearly terminal, short, thick, cylindric, ending in an abrupt, short and pointed hook. Palpi compressed, incurved in front of the head, the sides convex or angular; the last joint erect, pointing vertically. Wings when at rest erect. DIVISIONS. I. Palpi broad, very compressed in front. Antennae short, the club very thick. II. Palpi nearly square, very thick. Antennae elongated. III. Palpi with the last joint lengthened, slender. Antennae moderate. Generic Type _Hesperia Comma_ of Authors. * * * * * SPECIFIC CHARACTER. _Hesp. (Div. 2.) alis supra nigrescente-fuscis, basi nitido-caeruleis, anticis fascia mediali hyalina, posticis subtus fuscis, lineis duabus longitudinalibus viridi-flavis; pedibus fusco-aurantiis._ Hesperia (Div. 2.). Wings above blackish-brown, the base shining blue; anterior with a medial hyaline band; posterior beneath brown, with two longitudinal yellow-green lines. Legs brownish-orange. * * * * * The celebrated Latreille, the father of modern Entomology, has well observed, that the immense number of insects crowded together in the genus _Hesperia_ contain many natural genera, but which the paucity of species generally found in cabinets prevents us from discriminating. Having for a long time paid attention to this family, and possessing near 300 species in my own cabinet, I have had the opportunity of attempting their elucidation; and the above generic character is applied to those insects only which I propose considering genuine species of the genus _Hesperia_, and which will comprise near 170 species. I have named this new, undescribed and very rare insect, in honour of my esteemed friend A. H. Haworth, Esq. F.L.S., &c., well known by the benefits his writings have conferred on the sister sciences of entomology and botany. The only two insects I ever saw of this species I captured in the southern part of Brazil. * * * * * Pl. 29 [Illustration] MITRA cancellata. _Basket Mitre_--upper figure. * * * * * GENERIC CHARACTER.--See Pl. 23. * * * * * SPECIFIC CHARACTER. _M. (Div. 2.) testa fusiformi, cancellata; striis longitudinalibus incrassatis, spira aperturaque aequalibus; columella 5-plicata; spira sublaevi._ Shell fusiform, cancellated, the longitudinal striae thickened; spire and aperture of equal length; pillar five-plaited; spire nearly smooth. * * * * *