140 DIPTERA. 



are broader on segments 2 and 4 than on segment 3, and they probably exist on the following segments also, 

 but are hidden by the rows of erect fulvous hairs which are denser here. The thorax is clothed with 

 similar fulvous hairs, which are paler on its underside ; the dorsum has, in addition, a scattered orichal- 

 ceous tomentum. Pace and cheeks covered with dense pale yellow hairs ; the front with the usual black 

 erect pubescence, under which an appressed yellow tomentum is visible. Antennae black ; third joint in a 

 short cone, prolonged in a gradually tapering style ; occipital orbits beset with a scaly tomentum, which is 

 whitish below, and yellowish behind the vertex. Halteres with a yellow knob. Legs densely beset with 

 reddish-yellow scales, which hide the dark ground-colour ; tarsi black ; front tibiae beset with spinules. 

 "Wings hyaline ; costal cell only slightly tinged ; venation normal ; the enlargement of the costa near the 

 base has a fringe of black hairs in front, but its surface is clothed with white scales that, in an oblique 

 light, give a silvery reflection, the effect of which is increased by similar scales covering the patagia ; the 

 latter are particularly large and conspicuous in this species ; in the female the scales on the costal enlarge- 

 ment and on the patagia are yellowish, and therefore less striking. 

 Length 14-16 millim. . 



Hab. Mexico, Northern Sonora (Morrison). Three males and one female. 



Species of the genus Anthrax described from Mexico and Central America by former 

 authors, and not known to me : — 



Anthrax astarte, Wiedem. Aussereur. zweifl. Ins. ii. p. 637. — Mexico. — I have 



mentioned above (ante, p. 122) that one of the species described by me 



sub Nos. 8-10 is very probably A. astarte. 

 abbreviata, Wiedem. loc. cit. — Mexico. — A very peculiar species, certainly 



not among those I have before me. 

 sagata, Loew, Centur. viii. no. 34. — Mexico, Matamoras. — Allied to 



A. celer and A. fulvohirta. Description incomplete, as Loew's only 



specimen had no head. 

 quinque-punctata, Thomson, Kongl. Svenska Fregatten Eugen. Eesa, 



Zool. p. 484. — Panama. — Perhaps a Lepidanthrax neav L. proboscidea. 



nudiuscula, Thomson, loc. cit. p. 482. — Panama. 



leucothoa, Wiedem. loc. cit. p. 639. — Mexico. — This insect must resemble 



my A. ephebus. Compare my remarks about that resemblance (ante, 



p. 125). 

 flaviceps, Loew, Centur. viii. no. 29. — Mexico, Tamaulipas, 



The following species it is as well to notice here on account of the possibility of its 

 occurring within our northern boundary : — 



[Anthrax melasoma, van der Wulp, Tijdschr. voor Ent. xxv. p. 80, t. 9. f. 2. 



Arizona. — In this species the brown on the wings reaches the bifurca- 

 tion of the third vein ; it thus differs from all those above described by 

 me, except A. galathea. A. melasoma belongs to the group of 

 A. alcyon. Say.] . 



