]_74 [August, 



produced into an elevated triangle, which is open in front. In the male the ap- 

 pendages are about as long as the penultimate and ante-penultimate segments united, 

 stout and broad, flattened laterally, attenuate at the base, and then dilated to the 

 obtuse apex, slightly curved, dusky yellowish, but this colour is almost wholly con- 

 cealed in a dense clothing of long black hairs. 



Wings with a slight lacteous ground, on which are very distinct deep black 

 markings, and (especially in the anterior) black irrorations ; both pairs nearly equal 

 in form (the posterior slightly shorter), long and somewhat narrow, with straight 

 costal margin (and narrow costal area), subacute apex, and gradually rounded inner 

 margin, slightly sinuate below the apex. In the anterior wings the black markings 

 are as follows : — small points at the junction of the costal nervules with the subcosta, 

 larger ones at the commencement of the nervules arising from' the radius, two or 

 three still larger towards the base, and one at the commencement of the sector ; the 

 extreme base, post-costal region and the basal portion of the inner margin with 

 rather dense irrorations, and there is a submarginal series of small irrorations ex- 

 tending from near the apex to beyond the middle of the inner margin : there are 

 also two nearly opposite spots towards the base, one below the commencement of the 

 sector, the other at the termination of the branch of the lower cubitus ; an elongate 

 isolated spot on the disc rather before the middle, another, irregular and subinter- 

 rupted, beyond the middle, and yet another, more or less interrupted, ante-apical ; 

 pterostigmatic region (in both pairs) slightly opaque, scarcely evident. Posterior 

 wings almost without irrorations, save a few on the inner margin, but there are four 

 very distinct short, black, oblique fascise, viz., (1) slightly beyond the commencement 

 of the sector, commencing from the radius and extending about half across the 

 wing, excised within, and continued by a small spot at the end of the branch of the 

 lower cubitus ; (2) about the middle, also commencing from the radius, ex- 

 tending more than half across, dilated at its lower end, continued by a small 

 round spot, more towards the base, on the inner margin ; (3) ante-pterostigma- 

 tical, commencing from the costal margin, extending more than half across, and 

 with spot, sometimes united to it, internal to its lower end ; (4) ante-apical, en- 

 closing an apical pale spot, or itself divided into two spots (none of the markings 

 are quite symmetrical on the opposite wings of the same individual). Neuration 

 close, whitish if seen against a dark ground (but appearing blackish if seen against 

 a white ground), black where it traverses the black markings, and the radius is nearly 

 wholly black in the posterior. 



Length of body {cum append.), 48 — 50 mm. Expanse of wings, 110 — 117 mm. ; 

 greatest breadth of anterior wing, 16 — 17 mm. 



This fine insect is peculiar for the manner in which the black 

 markings of the wings stand out conspicuously from the lacteous 

 ground, this latter being naturally coincident with the desert habitat. 

 It is also remarkable for the broad flattened appendages of the ^ . As 

 a near ally, the Indian P. patiens, Wlk., may be mentioned, with which 

 it agrees entirely in form. Another undoubted near ally is the insect 

 from Arabia Felix figured by Klug, Symb. Phys., pi. xxxv, fig. 3, as 

 a variety of the male of his M. papilionoides. Several entomologists, 



