COSMOTRICHE. 157 



the genus Selemphera for lunigera, whilst potato7'ia did not receive 

 another name until Kirby called it Philudoria in 1892, it appears 

 to me correct to retain the name Cosmotriche for potatoria, a course 

 followed by Herrich-Schaffer (Sam ml. Aussereur. Schmeit., p. 9) in 

 1856. Meyrick, evidently ignorant of Aurivillius' excellent paper 

 (Iris, vii), describes (Handbook, &c, p. 323) the genus under the 

 name Odonestis as follows : 



Palpi rather long. Forewings : 6 and 7 connate or stalked, 9 to apex. 

 Hindwings : 6 from angle, 7 from beyond middle of cell, 8 connected with 7 near 

 origin by oblique bar. two or three pseudoneuria present. 



The egg is characteristically Eutrichid, and one cannot but 

 be struck with the remarkable similarity in the arrangement of 

 the markings of the eggs of Cosmotriche (potatoria) and Eutricha 

 (quercifolia) ; the former certainly lacks the distinctness and 

 definiteness of coloration presented by the latter, but the character- 

 istic markings of the eggs of both species are identical. Bacot 

 says : " The pattern of the Cosmotrichid (potatoria) egg, although 

 superficially like that of Eutricha (quercifolia), is simpler, and more 

 regular, the pale bands having consolidated until the egg might be 

 described as greenish-white, with darker spots and streaks ; it is 

 also more strongly pitted than that of E. quercifolia the pittings 

 being smaller, deeper, and not outlined in points as is the egg ot 

 the latter species." 



The newly-hatched larva of C. potatoria is similar in some 

 respects to that of L. var, callunae, but the colour and pattern 

 are differently arranged. The characters, however, in which 

 these resemblances are to be traced appear to be very gener- 

 alised ones, e.g., the black subdorsal patches of the larva of 

 L. var. callunae are present, but in a modified form, and the 

 meso- and metathorax are black on the dorsal and subdorsal 

 areas, forming a striking background for the pale yellow diamond- 

 shaped patch, and the subdorsal white spots (Bacot, July 

 nth, 1897). We have already noted that in the 2nd instar 

 the larva of C. potatoria has lost all traces of dorsal tubercles, 

 but has, on either side of the dorsal line, in addition to other 

 markings, a row of round black spots of very similar appearance, 

 and in about the same position as those of the larva of Dimorpha 

 versicolora in the same stage (Bacot). Comparing the larva of 

 C. potatoria with that of Dendrolimus pini (both in 2nd instar), one 

 does not notice so strong a development of secondary hairs in 

 the latter as in the former, and the colour does not spread from 

 the bases in so marked a manner, so that there is not the same 

 suggestion of shagreen tubercles as there is in C. potatoria. A 

 close comparison of these two larvae shows that the colour scheme 

 is fundamentally the same, but it is strongly developed in C. 

 potatoria and only faintly traceable in D. pini, the latter evidently 

 developing towards an unicolorous form, although there are still 

 one or two strongly-contrasted markings ; in C. potatoria the dorsal 

 area is practically bright yellow with a series of large oval central 

 blotches, dull bluish in colour, one on each segment from the ist- 

 8th abdominal ; these are joined to each other and form a chain, 

 the junction being made by two black spots placed slightly apart 

 and just showing the yellow between them. The black D. versicolora 



