1911., 13 



in a small spot at the apex are a few f erriif^-iin >iis scales and two larger ferrugi- 

 nous spots are found, one before and one beyond the middle, the first slightly 

 crossing the fold, the second at the end of the cell, these are both somewhat 

 sprinkled with black. Exj). al. 8-11 mm. Hindwings silvery bluish white ; 

 cilia very pale brownish cinereous. Abdomen ochreous at the base and on the 

 anal segment, with a broad pale greyish band between. Legs white, with 

 narrow black tarsal annulations. 



Tijjje c? (96535) ; ? (96150) Mus. Wlsm., b.m.* 



Hah.: Algeria: Biskra, 1-21. IV. 1903 (l^?sm.) ; Hammam-es-Salahin, 

 2-23.IV.1904, © Anabasis articidata, 27.XII — 30.1.1904 (Wlsm.). 

 Thii'ty-six specimeiis. 



The larva miiies the leadiug articulations of Anabasis articidata : it is 

 of a reddish white colour, with pink bands across the meso- and meta- 

 nota, reproduced more faintly on the adjacent abdominal segments ; 

 the head is pale brown, and there is no visible pronotal plate. 

 GeJechia gecko and parviindex are extremely close to each other, and 

 I have bred both from Anabasis articidata, failing to notice that there 

 were two distinct larvae, for they cannot of course be confused with 

 the Scythris larva which spins its slender webs among the shoots. It 

 is of course possible that the one lai-va which produced parvijndex in 

 my three bottles of Anabasis may have been accidentally introduced. 

 The palpi of gecko have the terminal joint somewhat shorter and 

 stouter than that of parviindex, and with two distinct black annula- 

 tions, whereas in parvipulex the terminal joint is more slender and 

 acuminate, with but one distinct annulation, moreover, the costal 

 streak at one-fourth from the base is invariably oblique in parvijndex, 

 and usually reverting upward at its apex to a semidetached spot a 

 little beyond it. In gecko, on the contrary, this streak is much more 

 erect, not reverting upward at its apex, although sometimes partially 

 blending with a brownish spot outside its lower extremity. The an- 

 tennae are also somewhat more distinctly annulated in gecko and the 

 average size is a little larger, the whole insect having a greyer and 

 more powdery appearance. 



2700'2. LiTA PARVIPULEX, sp. n. 



Antennae brown, with whitish ochreoiis annulations. Palpi creamy white. 

 Head and Thorax creamy whitish. Forewings shoi't, lanceolate, subacute; 

 creamy white, specked and s^jotted with dark luuber-brown ; there is a group 

 of three spots forming a triangle at the base, two at half the wing-width, 

 and a third, forming the apex, on the costa at about one-fourth ; an oblique 



The Walsiiigliam Collections were transferred to the British Museum, April 1st, 1910. — 



Jno. Hartley Durrant. 



