2 26 SOUTH- AFRICAN BUTTERFLIES. 



233. (1.) Deloneura immaculata, Trim en. 



Deloneura immaculata, Trim., Trans. Eiit. Soc. Loud., iS68, p. 83, pi. 5, 

 f. 4. 



Uxp. al., I in. 5-9 lin. 



Ochreous-yellow, vAthout marhings of any hind. Under side. — 

 Hind-wing and an ill-defined costal, apical, and liiud-niarginal border 

 rather paler. 



Head, with palpi and antennas, dull-black, — the former with two 

 spots on forehead, two on summit, and two behind eyes ochreous- 

 yellow ; antennae tipped with ochreous-yellow. Thorax dull-black, with 

 pale ochreous-yellow scales and short hairs superiorly, and four or five 

 ochreous-yellow spots laterally. AMomcn ochreous-yellow, mixed with 

 fuscous superiorly. 



The three examples discovered Ijv Colonel Bowker at the end of December 

 1S63 at Fort Bowker, on tlie Bashee River, remain the only known represen- 

 tatives of this remarkable butterfly. The first specimen was captured on the 

 27th December, and the other two during the remaining days before the ist 

 January. Colonel Bowker described the insect as very rare, and only appear- 

 ing for a few days ; specimens were also most difficult to procure, owing to 

 their liabit of " whirling slowly with flapping wings round the tops of trees, 

 rising and falling, sailing away and returning." lie was struck with its resem- 

 blance to the " yellow tree-moth " — I believe a species of Aroa (a day-flying 

 Liparide form allied to Orgyia) — which abounds in the wooded parts of South 

 Africa, and it is not impossible that Deloneura mimics these probably j^ro- 

 tected moths, and so may escape notice among the companies of the latter. It 

 must be observed, however, that Colonel Bowker has in vain looked out for 

 the butterfly during all his subsequent years of active search in the various 

 forest-clad districts he has visited ; and I tliink it unlikely to have escaped 

 the notice of so practised a collector if it were really native to those tracts of 

 country. 



Locality of Deloneura immaculata. 



' I. South Africa. 



D. Kaffraria Proper. — Bashee River (/. //. Boicl-er). 



Genus ARRUGIA. 



Arrugia, Wallengren, Iv. Vetensk.-Akad. Fcirhandl., 1872, p. 47. 

 1 Zeritis, Trim., Rhop. Afr. Aust., ii. p. 278 (1866). 



Imago. — Head small, — narrower in $ ; po/jji long, with both second 

 and terminal joints longer in $ ; anteimce short or very short, thick, 

 blunt at tip, — in $ gradually incrassate from base, in $ of almost equal 

 thickness from very near base. 



Thorax very or exceedingly robust in ^, and not much less so in 

 $. Wings rather elongate, quite entire ; fore-wings with costa nearly 

 straight, a little deflected at apex ; hind-margin slightly convex in 

 ^, decidedly so in $ ; sxibcostal nervure four-branched, — the first and 



