938 LORD WALSINGHAM ON THE [Nov. 26, 



36. (2584) Gelechia plutelliformis Stgr. 



= olhiaella Mill. ; = sieioersiellus Chr. (nee sieversi Stgr., sp. alt., 

 2584-01). 



Gelechia jdictelliforonis Stgr. Stett. Ent. Ztg. XX. 239 no. 79 

 (1859)' ; Stn. Tin. S-Eur. 141, 147 no. 18, 360 (1869) -. Alacita 

 olbiaella Mill. Ic. Clien-Lp. I. 193-6. PI. 1 • 1-6 (1861) ^ Stn. 

 Tin. S-Eur. 167, 182-5 no. 10 (1869) \ Hypsolo2:>lms sieioer- 

 siellus Chr. Stett. Ent. Ztg. XXVIII. 239-40 (1867) ^ Geledda 

 2)liaelliformis Stgr. Berl. Ent. Zts. XIV. 309-10 no. 91 (1870)^ : 

 Stgr-Wk. Oat. Lp. Eur. 290 no. 1832 (1871)'; Mill. Cat. Lp. 

 Alp-Mar. 326 (1875)^; Hrtm. MT. Munch. Ent. Ver. IV. 16 

 no. 1832(1880)"; Curo Cat. Lp. Ital. VI. 38 (1882)"; Rouast 

 Cat. Chen. Eur. 155 (1883) ''; Chr. Mem. Lp. Rmhf. II. 158 

 no. 316 (1885) '- ; Rbl. Ann. KK. Hofmus. VIL 274, 283 no. 56 

 (1892)": XIIL 377, 381 no. 203 (1898)": XXI. 44 no. 209 

 (1906) '' : Stgr-Rbl. Cat. Lp. Pal. II. 144 no. 2584 (1901) '\ 



Hah. S. Spain '-^' '"'' "■ "' ".— S. France ^-*' '-"' '"' "• ".— SE. 

 Russia : Sarepta '' '' '"■ '^ 23. V. 1866, 1. VII. 1866, 11. VIIL 

 870 (Ghristojyh). Pontus "' '''.—Syria ". — Tura'-- "■ '« : Tama- 

 Ha; '■'■'"": gaUica '-''"-'' : laxa''': paUasii''', III-IV^; VI- 

 VIII '■ ' ; IX ' ; aiitumn '' '' ", excl. V ^-VI ^' '' ' ; VII '''' '■ ' ; 

 YJJJ3-1. 8-9_jx''. Canaries ''""—Tenerife ''■" : Guimar, 15. I. 

 1898 {HintzY^; Santa Cruz, 17. 1 - 2. II. 1907, Tamarix 

 gaUica, XII-I, excl. 20. II - 17. IV. 1907 (msm.) ; Monte de 

 Aguirre, 800 m., 21. VII. 1889 {S'imom/) ". 



Among a series of fifteen specimens, bred from Tamarix gallica, 

 near Santa Cruz, one pale variety approaches somewhat closely 

 in colour to the Algerian sinuatella, Wlsm. [Ent. Mo. Mag. XL. 

 223 (1904)], but the form of the markings is distinctly that of 

 plutelliformis, which it resembles also in its smaller size. 



The larva feeds on Tamarix gallica, jn December and January, 

 the moth flying in January, February, and March. 



Larva, somewhat attenuate to either extremity, greenish 

 yellow, with reddish patches on the anterior portion of each 

 segment, and a few, sparsely distributed, bristly hairs ; there is 

 a single black dot on either side of each thoracic somite. Head 

 pale green ; no distinguishable pi-onotal plate ; legs and claspers 

 long, blackish. 



In 1859 Staudingei- described Gelechia plutelliformis (Stett. Ent. Ztg. XX. 239) 

 from two $ $ bred from larvae taken at Chiclana, and in 1870 lie described 

 Gelechia sieversi Chr. in litt. (Berl. Ent. Zts. XIV. 309-10), pointing out the 

 differences between the two species, and adopting Christoph's name, apparently 

 overlooking Christoph's description of Sypsolophtis sieiversiellus (Stett. Ent. Ztg. 

 XXVIII. 239-40). The two species are quite distinct and easily separated: in 

 plutelliformis the dark streak reaches to the base, and is sinuate thus "^v/->>/^ ^ 

 being clearly defined beneath hj' whitish ochreous, but above it fades away into the 

 ground-colour of the wing; at the extremity of the dark sinuate line is a dark 

 extension, sometimes separated from it. In sieversi the longitudinal dark marking- 

 may be best described as a cuneate streak commencing at half the wing-length and 

 attenuate towards the base, which it does not reach ; this streak is sharply edged 

 with whitish above, and slightly beyond its outer extremity, in line with its upper 



