1893.] BBITISH CENTRAL AFRICA. 665 



African species, which agrees with Felder's description closely- 

 enough (I should have imagined) to satisfy anyone ; but, probably 

 because the base o? the front wings on the under surface is said to 

 be tinted with sulphur (a character only faintly indicated at the 

 base of the costal border in the males), it is regarded as a variety 

 of B. severina. Felder, comparing his Pieris agripjnna with the 

 latter species, rightly observes that it has the costal margins of the 

 wings longer and the cells longer and narrower ; he also notes 

 that the white spots on the black apical area of the primaries are 

 tolerably large, the inner edge of the outer border of the second- 

 aries squamose, and the veins on the under surface of the same 

 wings violaceous brownish, none of which characters are found in 

 typical B. severina, nor have I ever met with a variety of that 

 species possessing them. B. lordaca is, as Trimen observes, 

 doubtless the same species as B. mesentina ; but as to B. auriginea 

 being the spring brood. Col. Terbury's collection rather tended to 

 show that it prevailed in the autumn, if I remember rightly. 



114. Belbnois gidica. 



Pieris gidica, Godart, Enc. Meth. ix. p. 131, n. 37 (1819), 

 2 , Lake Mweru. 



115. Bblenois cbawshati, sp. n. 



cJ . Allied to B. zochalia. Above greenish white : primaries with 

 silvery sericeous base ; costal margin slenderly edged with black ; 

 the external border formed as in B. calypso, but rather moi-e 

 decided and without the apical white streak between the first and 

 second spots; the five spots which remain quite white, the 

 first, thu'd, and fifth small and sagittate, the second larger and 

 pyriform, the fourth minute and squamose ; a very conspicuous 

 black spot on the lower discocellular veinlet : secondaries with 

 weil-detined marginal black spots. Primaries below with the 

 apical area pale sulphur-yellow, crossed by olive-brown veins 

 and edged internally from costa to lower radial vein by an 

 irregular narrow band of the same colour, below this by a grey 

 lunule which connects it with a triangular black spot on second 

 median interspace ; black discocellular spot as above : secondaries 

 creamy sulphur, with basal third of costal margin and a short 

 iuterno-median basal streak of safirron- or cadmium-yellow • the 

 ve'ns, a forked marking in the cell, an oblique bar on the lower 

 discoceUulars, too or three squamose streaks across the base of 

 the interno-median and first median areas, a partly disconnected 

 zigzag submarginal stripe, and a series of broadly triangular 

 marginal spots pale olive-brown ; fringe white, spotted mth grey 

 and tipped with black at the extremities of the median branches : 

 body below creamy whitish, the palpi pure white. Expanse of wings 

 63 millim. 



Lake Mweru. 



We have two males of this species in the Museum from Lake 

 Tanganyika. 



45* 



