496 Mr. G. A. K. Marshall on 



captured by Mr. Marshall at Salisbury on April 6, 1898, 

 together with a male of Acnva doublcdayi, var. axina 

 (Fig. 12, Plate XVI), which is one of the many smaller 

 Acraeas, to which it bears a somewhat generalized resem- 

 blance on the under-side of its wings in the natural posi- 

 tion of rest, which is nearly but not quite represented in 

 Fig. 13 (see the description of the Plate). Mr. Marshall 

 has sent the following account of the attitude : — 



" Scdishury, Feb. 12, 1899. — The Baoris netoplia rest with 

 closed wings, and the fore-wings pressed well within the 

 hind-wings so as to hide the white spots; they then look 

 much more J.ryvi'«-like." 



The curious reticulate under surface of the hind wings 

 of the isolated and remarkable Hesperid Gijdopidcs willcmi 

 is mimetic of the probably distasteful AUwia nyassie, which 

 possesses a somewhat similar but much coarser reticulation. 

 Mr. Marshall states that the resemblance is much enhanced 

 in the resting attitude of both species by the concealment 

 of the fore-wings, with the exception of the apex, within 

 the hind. Botli species frequent the same localities, and 

 both rest upon grass-stems. One of each species was 

 captured at Salisbury on Feb. 23, 1901, and another similar 

 pair on March 3, 1901. 



In thus bringing together Mr. Marshall's examples of 

 mimicry in Hespcridic, it is appropriate to include the 

 following interesting case of mimicry on the part of a 

 Hesperid for a Danaine larva. 



'i Sidislmry, March 10, 1898.— The larva of the large 

 'skipper' Bho'palocaynpta forcstan possesses a colouring 

 wonderfully similar t(j that of L. chrysipims, though it lacks 

 the filaments. I only know the larvte of three other 

 species of Hesperidiv and they are all green ; moreover, 

 they form shelters for themselves, and never come out to 

 feed except after dusk ; Avhereas, although forestall also 

 forms a shelter, yet it frequently comes out and feeds in 

 broad daylight, when it is a very conspicuous object." 



The upper-side of Alivna nyassm appears to fit in with 

 the strong combination of black-and-white Ethiopian 

 butterrties belonging to the Danainx and Acnvinx and 

 their Batesian and Mtillerian mimics. Among the smaller 

 of the latter Ncptis agatlia is probably to be placed, and 

 this species is on the wing with the much smaller Lyca3nid. 

 Thus Mr. Marshall has sent to the Hope Department 

 specimens of the Neptts captured at Salisbury on March 



