( 322 ) 



antlidi's who ex|in'Sse(l an (ipinion dii these insects has noticed that the well-known 

 thorn lit the end of the foretihia of occ II ata is absent from planus I Besides this 

 very obvions difference, which some authors might be inclined to treat as of generic 

 value, we mention that the antenna of the S is decidedly longer and thicker than in 

 specimens of oecUntd of the same size. The genital armature of the 3 is similar 

 to that of ocellata, but the tenth tergite is longer, the sternite broader, the harjje 

 narrower, aud the conical tooth of the penis-sbeath stouter and longer, often bearing 

 one or more small teeth. The vaginal jjlate also agrees with that of ocellata ; the 

 transverse ridge in front of the orifice, however, is not incised mesialjy. These 

 genital differences are not ver}' conspicuous, but tliey become more important if we 

 consider that there is as close an affinity also between the genital armature of 

 ocellata aud kindermaiini, which insects nobody will venture to treat as specifically 

 identical. Dcellata and planus have originated from the same form, but they have 

 become so ditferent that they could doubtless exist together in the same jilace 

 without losing their independence, or, in other words, without fusing into one 

 species. 



Larva jiale green, with white or yellowish side-bands. — Food-plants : Pop/tins, 

 Salix. 



Hah. Eastern Siberia to ('entral China and Japan. 



In the Triug Museum 2 pupae, 12 tJc?, 8 ? ? from : Yokohama, July, August ; 

 Amurland : China. 



272. Sphinx cerisyi. 



Smerhithiix {■riixi/l Kirby, in Richards., Fauna /l<ir.-Aiiin: iv. p. .'iOl. n. 1. t. 4. f. 4 (1827). 



S ? . Anterior tibia proiluced into a thorn at the end. Pulvillus large. Antenna 

 of (? rather larger than in ocellata, subpeetinate, the segments being dorso-laterally 

 more obviously dilated, the ventral outline of the segments (in side-view) less 

 straight thau in ocellata, the apical ciliae rather longer ; the median segments of 

 the ? -antenna a little longer than broad. The eye-spot has three blue markings, 

 the first often obsolete, the second and third mostly forming a riug. 



S. Tenth tergite (PI. XXII. f. l.j) rounded at end, broad, slightly bent 

 downwards, concave beneath, the side-edges somewhat undulate ; sternite with a 

 triangular lobe, individnally variable, slender as a rule. Clasper narrower than in 

 kiiulcrmanni, with a prominent dorsal subapical ridge (which is rudiiueutary in 

 khidennanni), this process projecting mesiad (PI. XXXIV. f. 27), different in some 

 of the subsjiecies ; hari)e irregularly triangular, more or less pointed ; below tlie 

 concave incrassate dorsal edge of the clasper there is a prominent longitudinal 

 fold. Penis-sheath with an apical tooth, conical, projecting laterad (PI. XXIX. 

 f. 42) ; duct with a patch of s])ines as in ocellata. 



?. Vaginal plate small, membranous, anterior edge of the vaginal orifice not 

 stronger chitinised than the sides, not forming a ridge, the orifice covered by the 

 seventh sternite, lying in a deep membranaceous cavity without any special armature. 



Larva pale-green, side-stripes yellowish white ; horn blue, tip black. — Food- 

 plant : Salix. 



Chrysalis not described. 



A]iparently two broods in the southern districts, the second most likely 

 irregular. 



Hah. ( 'anada to Mexico, California, and Vancouver Island ; not recorded from 

 Florida, Louisiana, or Texas. 



