THE CANADIAN ENTOMOLOGIST. 27 



seems an entire absence of the latter at any tubercle on joints two to ten, 

 inclusive. The accessory plate IVa on joint ten does not appear. Length, 

 ^S to 40 mm. 



Maturity shows the larva a little more translucent, with the former 

 characteristics continuing; setce, however, are now found at the usual 

 plates. It is possible the inflate of the preceding stage may have 

 suffered in preparation, as the hairs ought normally to be present. Head, 

 2.6 mm. wide ; tubercles defined by the merest black dots ; IVa absent 

 on joint ten; spiracles small, black. Length, 42 to 45 mm. Pupation 

 occurs Aug. 15 to 21 ; emergence, Sept. 30 to Oct. 28. 



By the difference in colour of the head one may readily separate this 

 larva from either 7iitela or eupatorii, and differences of the dorsal line, or 

 the tubercle IVa on joint ten, afford distinguishing features when compar- 

 ing necopina, iinperturbata, or nelita, while it is a month behind the last 

 named species in final developments. 



The active, shining, chestnut-brown pupa has no frontal development 

 or other feature out of the ordinary. The anal spur consists of two 

 divergent, slightly curved and very sharp branches. Length, 20 mm. 



It has recently developed that one of our Papaipema moths is 

 incorrectly determined, and permission has been granted to define this 

 improperly-placed species. Material forwarded to the British Museum to 

 assist a forthcoming volume of the Catalogue of Lepidoptera, contained 

 examples of the presumed limpida^ of Guenee. Sir Geo. Hampson 

 informs us, however, that the determination is quite in error, that the 

 type, which is there placed, positively represents some other species. 

 This leaves the species we have been calling limpida without position, 

 and as it is one which the writer observed in its early stages at Rye, 

 permission for a further treatment affords great pleasure. It had been 

 inferred from Grote's writings that limpida was very close to cerussata, so 

 it was easy to get this erroneous impression concerning our Speedwell 

 form. The very labour involved in beating and securing bred examples, 

 together with its trim appearance and distinctive larval phases, has quite 

 endeared the species to the writer. Also its rarity as a larva, the 

 extremely local features of its occurrence, which is more a particular plant 

 selection rather than a case of geographical distribution, and its late 

 appearance as a moth, has surrounded the species with an individuality 

 most welcome in a genus necessarily showing many commingling 

 characteristics. During the seven years since the larva was discovered in 



