130 



ME. R. M £ LACHLAN ON NEW FORMS, ETC., 



Long, antenn. 16 lin. ( = 34 mill.); long. corp. 3^ lin. (=8 mill.); 



exp. alar. 13| lin. ( = 28 mill.). 

 Hub. America borealis (in Mus. auct.). 



Fuscous. Head: occiput with two very large, oval (or somewhat reni- 

 form) yellow tubercles on the disk, on each side, and two more 

 elongate ones posteriorly, each of these latter extending below the 

 eye, these tubercles clothed with short yellow hairs ; face and palpi 

 yellow, or yellowish ochreous ; antennae very long and slender, the 

 basal joint ochreous, somewhat fuscescent, the succeeding ten or 

 twelve joints yellow, each with a very narrow fuscous ring at its 

 apex, the rest fuscous, gradually shading off from the yellow of the 

 basal joints. Thorax fuscous, hairless; the metanotum with a de- 

 pressed space in the middle, which is somewhat yellowish. Legs 

 pale yellow, a black dot on each of the trochanters, and the apex of 

 the tibiae, and the apical joint of the tarsi also with a black point ; 

 anterior tibiae with two short and subequal apical spurs; interme- 

 diate and posterior tibiae each with two pairs of long and unequal yellow 

 spurs. Abdomen ochreous, somewhat fuscescent, margin of the ter- 

 minal joint with a fringe of long yellow hairs : inferior appendices 

 very long and slender, yellow and cylindrical, approximate at the 

 apex, two-jointed, the apical joint curved upwards; penis short, 

 roundly capitate at its apex. 

 Anterior wings long and narrow, gradually dilated to before the apex, 

 which is subelliptical, nearly nude, and shining, pale straw-yellow, 

 with numerous pale fuscous markings, as follows : — rather beyond 

 the middle are two fasciae commencing together on the costa, but 

 then running obliquely into the inner margin in different directions, 

 leaving a broad triangular space between them, in which is a line 

 and one or two points ; the apex broadly fuscous, ending in a narrow 

 transverse curved line of the pale ground-colour ; the basal portion of 

 the wing before the first fascia is occupied by numerous short transverse 

 streaks and points, and then several similar streaks between the second 

 fascia and the apical portion ; pterostigma indicated by a subopaque 

 space clothed with short yellow pubescence ; veins pale yellow. Pos- 

 terior wings whitish hyaline, the costa abruptly excised before the 

 apex ; extreme apex rather broadly margined with pale grey ; veins 

 greyish-white, more obscure at the apex ; fringe of the anal margin 

 whitish. (PI. III. fig. 14.) 

 I possess about nine male examples, sent to me by Mr. Eidings, 

 of Philadelphia, with other North- American insects, but without 

 any special indication of locality. Possibly the nearest ally of 

 the species is the Brazilian M. maculatum of Perty (Delect. 

 Anira.). It is a strikingly elegant form. 



