260 



PSTCHE. 



[Apill 1S93 



riously under their silken web on the 

 fresh terminal leaves of new shoots, I 

 supposed them to be Tortricid larvae, 

 and came near neglecting to rear them. 

 A large proportion of the new shoots 

 of the poplar (Populus balsatniferd) 

 in the valley were infested with these 

 larvae. 



I have not seen any record of the 

 occurrence of this species in the United 

 States, except that the name is given in 

 Hy . Edwards's Catalogue of transforma- 

 tions of North American Lepidoptera 

 with three references to European 

 authors. I have been enabled to deter- 

 mine these moths to belong to the Eu- 

 ropean species from some figures which 

 my sister, Mrs. S. Knopf, kindly made 

 for me at Paris, France. 



I believe that there are five larval 

 stages, but I have not observed them in 

 sequence and I have not seen the egg. 



Sarrothripa reveyana S. V. 



Egg. Not observed. 



First larval stage. Head rounded, partly 

 retracted under joint 2, furnished with a few- 

 hairs ; width 0.4 mm. Body apparently like 

 that of the mature larva; a few hairs. 

 (Described from a dead discolored speci- 

 men.) 



Second stage. Like the mature larva ex- 

 cept in size; pale yellowish green, smooth; 

 hairs whitish, curling backward. Width of 

 head 0.6 mm. 



Third stage. Only the cast head-case was 

 observed ; width 0.9 mm. 



Fourth stage. Width of cast head-case, 

 1.2 mm. 



Fifth stage. Head round, pale greenish, 



not shiny; ocelli black, mouth white, jaws 

 brown; a few hairs; width i.S mm. Body 

 cylindrical, folded between the segments, 

 tapering slightly from the middle to the ex- 

 tremities; feet normal. Hairs few, fine and 

 long, white, growing from the skin, there 

 being no warts nor tubercles perceptible even 

 with a glass, but the single hairs are ar- 

 ranged in the same manner as the warts of 

 the Arctiidae; row 4 is just below- the stig- 

 matal line and the hairs each a little back of 

 a spiracle; 5 anteriorly and 6 posteriorly on 

 the segments in the subventral space, and 

 7 consists of four small hairs on the venter 

 of the legless segments. Body velvety yel- 

 lowish green, subtranslucent, the dorsal ves- 

 sel darker; a very faint yellowish stigmatal 

 line ; feet tipped with brown ; spiracles mi- 

 nute, ocherous. The larvae live gregari- 

 ously or, more rarely, singly under a silken 

 web spun on the upper side of a tender leaf 

 some distance above the surface. They will 

 not eat the old hard leaves. 



Cocoon. Composed entirely of white 

 opaque silk and spun between two leaves or in 

 some other place that will furnish the nec- 

 essary support for the first vertical threads a- 

 gainst which the cocoon is built. It recalls in 

 shape the cocoon of Nola trinotafa, but con- 

 tains no bark and is larger and thicker. The 

 base is flat, the sides nearly straight, and one 

 end is pointed above, from which the top 

 slightly tapers to the other end. The end be- 

 low the point opens like a pair of vertical 

 doors for the emergence of the moth. 



Pupa. Cylindrical, thorax rounded, ab- 

 domen only very slightly tapering, the last 

 segments rounded; cremaster none. Smooth, 

 pale whitish with a brown tinge and a broad 

 dark brown dorsal shade running the whole 

 length. Length, 10 mm. ; width, 3 mm. 



Food plants. Poplar (Populus) and wil- 

 low (Salix). 



Larvae from Mariposa Co., California. 



Note. — A study of California butterflies 

 and especially their comparison with those 

 of Eastern America and Europe leads S. H. 



Scudder in the Overland monthly for April 

 to claim that the highest type of human civ- 

 ilization is to arise on the Pacific coast. 



