ANTHEAX. 123 



also with black hairs. Legs pale reddish, densely clothed with whitish scales ; femora at the base and 

 the tarsi darker. 

 Length 12-14 millim. 



Hob. Mexico, Northern Sonora (Morrison). 



Two male specimens. 



This species belongs to the same natural group as the European A. fenestrata and 

 A. perspicillaris, Loew. A. elegans, Hoffm., and its allies, and very probably the 

 other species mentioned by Loew (Beschr. eur. Dipt, i.) as closely related to 

 A. fenestrate also belong here. This group may be called Thuridanthrax (from 

 Thyris, window), and is characterized by its colouring. The antero-proximal half of 

 the wings is more or less dark, with more or less large subpellucid spots or cross-veins 

 and bifurcations; the dark abdomen has white stripes on the third and fourth 

 segments; the third joint of the antennae is in the shape of an elongate cone, 

 gradually merging into a style, which is not longer than the cone ; the face moderately 

 projecting ; the proboscis withdrawn (projecting a little in A. elegans, Hoffm.) ; the 

 front tibiae smooth ; the front tarsi comparatively stout, slightly tapering, beset on both 

 sides with delicate, erect hairs, but no spinules ; the front ungues rather small ; no 

 pul villi. 



Those species of Anthrax (sensu stricto) which have the wings of nearly the same 

 colour as Thyridanthrax differ from the latter in the shape of the antennae, in the 

 presence of spinules on the front tibiae, in the colouring of the abdomen, and some- 

 times in the presence of more or less distinct pulvilli. 



Anthrax pertusa, Loew, Centur. viii. no. 28 (from Pecos River), is a Thyridanthrax. 



12. Anthrax ? 



Hob. Mexico (Sumiehrast). 



Not unlike A. ephebus ; the differences are : — the larger brown spot on the cross-vein 

 at the base of the second posterior cell, in size fully equalling the spot on the 

 bifurcation of the third vein ; the front tibiae smooth, without spinules ; the front 

 tarsi with indistinct joints and small ungues ; the brown on the antero-proximal half 

 of the wings a little darker, its boundary well denned and not evanescent, a difference 

 which is especially marked between the discal cell and the costa. The four specimens 

 in Prof. Bellardi's collection are a little smaller than the average ones of A. ephebus, 

 and measure from 6 to 8*5 millim. ; they are abraded and covered with dust, so as 

 to be unfit for description. 



13. Anthrax galathea, sp. n., 6 . (Tab. II. fig. 15.) 



Deep velvety -black ; the sides of the thorax in front of the wings beset with golden-fulvous hairs, the pectus 

 with similar but paler hairs ; similar hairs, on each side, behind the wings, also at the base of the 

 abdomen, on the sides of the first and second segments ; fifth segment black in the middle, and beset 

 on each side of the black with golden appressed scaly hairs, the hairs not quite reaching the sides of the 



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