HESPERID.E. 297 



tionally much smaller ochreous spots of tlio hind-marginal row in the 

 fore-wings of both sexes and in the hind-wings of the $. On the 

 upper side of the hind-wings of the $ Chaca there are, however, an 

 indistinct central spot, and traces of three hind-marginal spots not 

 found in the ^ Mohozntza. The under side in both sexes differs from 

 that of MoJiozutza by being paler ; by having a row of distinct black 

 spots, instead of a black streak, along the hind-marginal edge of the 

 wings ; and by presenting a whitish transverse band before the middle 

 in the hind-wings. 



IMr. Eowker took this butterlly in several localities near the Tsomo River, 

 ICafTrai'ia, in December, and notes it as occurring in " open grassy glades between 

 forests upon high mountains, sitting on flowers with closed wings." Mrs. 

 Barber, however, who met with the species near Bathurst in ]\farch 1870, 

 writes that it frequented " long grass, in rather a low and damp locality, among 

 trees." Mr. SchifFman's specimens were captured on one of the hills round 

 Graharastown, but I am not aAvare in what kind of station. 



The species appears to be rare and very local ; I have seen only two 

 examples of each sex. 



Localities of Pyrgus Chaca. 



I. South Africa. 



B. Cape Colon}'. 



h. Eastern Districts. — Grahamstown ( — Schiffman). Bathurst {Mrs. 

 Barber). 



II. Other African Regions. 

 A. South Tropical. 



a. Western Coast. — " Angola (Por/f/e)." — Dewitz. 

 D. Kaff"raria Proper. — Tsomo River (J. H. Boichtr). 



337. (U.) Pyrgus Tucusa, Trimen. 



Pyrgus TiicKsa, Trim., Trans. Eiit. Soc. Loud., 1SS3, p. 359. 



£xp. al., I in. 1-3 liu. 



^ Fuscous, with semi-transparent white spots. Fore-winy: a dull 

 yellowish-white scaling from base to before middle along costa, median 

 nervure, and inner margin ; at extremity of discoidal cell two elongate 

 spots, one above the other ; a discal continuous row of nine spots, 

 strongly curved outwardly in its upper portion, but thence sharply 

 deflected inwardly to submedian nervure a little beyond middle ; of 

 this row the largest spot is the seventh (immediately below disco- 

 cellular spots), and the smallest the eighth ; close to upper part of 

 hind-margin a row of five almost obsolete dull fulvous-ochreous spots. 

 Hind-iving : median and submedian nervures clothed with dull yellow- 

 ish-white scales and hairs ; at extremity of cell an ill-defined whitish 

 spot. Cilia white, in fore-iving with narrow fuscous nervular interrup- 

 tions, in hind-wing with scarcely visible similar interruptions. Under 

 SIDE. — Dull creamy ivhite, varied with very pale fulvous and idth small 



