1910.] FROM NORTHERN ltUODESIA. 25 



flush is less extensive than in caldarena, and the cream-coloured 

 spots enclosed in the fenestrated black line forming the hind 

 margin are somewhat wider and deeper. 



The females of this species are less easily distinguished from 

 those of caldarena but exhibit the same characteristics in the 

 distribution of spots. They are very variable in colour and 

 exhibit the same tendenc}" to duskiness in the wet season as do 

 those of caldarena, and also often have a whitish, lightly scaled 

 subapical area. Specimens of detecta differ a good deal in size 

 but are on the average considerably smaller than the caldarena. 

 The species is described from 15 males and 11 females, all from 

 the Luangwa valley. 



Type in the British Museum ; cotypesin the Hope Coll., Oxford. 



I found this species in fair numbers in the Luangwa valley 

 especially in the wet season. It occurs side by side with caldarena, 

 and indeed for a long time I did not distinguish the two species. 



ACR.EA CALDARENA. 



Acrwa caldarena, Hew. Ent. M. Mag. xiv. p. 52 (1877). 



This species was abundant in the Fort Jameson district and the 

 whole Luangwa valley. It occurred sparingly on the Alala 

 plateau between the Luangwa river and Broken Hill, but I did 

 not take it to the north of the Chambezi river, in N.E. Rhodesia, 

 nor anywhere in Katanga. Within its range it is equally 

 common either in woodland or in the open. It has a weak flight 

 and keeps near the ground. It is on the wing at all seasons 

 but is scarcer in the dry season when it is usually of a brighter 

 colour, some specimens from the hot dry Luangwa valley being 

 a peculiar shade of salmon -pink. 



ACR^EA ATERGATIS Westw. 



Sparingly in the Broken Hill district and in the northern 

 portion of N.E. Rhodesia. Common in Katanga. Does not 

 occur in the Luangwa valley or apparently east of it. It is on 

 the wing all the year except in the height of the dry season, vii. 

 and viii. Much resembles A. atolmis Westw. on the wing, 

 and frequents rather open country. 



ACRiEA AXINA Westw. 



Fairly common between Tete on the Zambezi and Fort Jameson, 

 ii. and iii. One female was taken on the Alala plateau, 

 xi. These localities seem to be about the northern boundary 

 of the species. 



ACR^EA ONC<EA HopfF. 



Abundant at all seasons in the Luangwa valley and to the east 

 of it. Somewhat local west of the Mchinga escarpment, but fairly 

 common in the Lake Bangweolo district. Not met with in 

 Katanga. This species furnishes another instance where the 



