( 322 ) 



iiutliors who expressed an (iiiiiiioii on tliese insects lias noticed tli.at the well-known 

 thorn at the end of tlie iovvlilna, of occUata is absent from //lanusl Besides this 

 very obvious diflerence, wliicli some authors might be inclined to treat as of generic 

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

 sju'cimens of oceUata of the same size. Tlie genital armature of the S is similar 

 to tlnit of occUafa, but tlie tenth tergitc is longer, the sternite broader, the liarj)e 

 narrower, and the conical tooth of tlu; ])enis-sheath stouter and longer, often bearing 

 one or more small teetli. The vaginal i)late also agrees with that of ocellata ; the 

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

 genital difterenccs are not very consjiicuous, but they become more important if we 

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

 ocellata and kiiirlennanni, which insects nobody will venture to treat as sjiecifically 

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

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

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

 species. 



Larva pale green, with white or yellowish side-bauds. — Food-plants : Foji"l"s, 

 Sali.i-. 



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



In the Tring Museum 2 j)upae, 12 (?c?, 8 ? ? from : Yokohama, July, August ; 

 Amurlaud ; China. 



272. Sphinx cerisyi. 



Smeriiithis irrisi/i Kirl)y, in Richards., Fauna Ilui-.-Anirr. iv. p. 301. n. 1. t. 4. f. 4 (1827). 



S ? . Anterior tibia jiroduced into a thorn at the end. Pulvillus large. Anternia 

 of (? rather larger than in ocellata, subpt>ctiuate, the segments being dorso-laterally 

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

 straight than 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 ring. 



S. Tenth tergite (PI. XXII. f. 15) rounded at end, broad, slightly bent 

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

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

 kiiitlevmanni, with a prominent dorsal subapical ridge (which is rudimentary in 

 kindermanni), this process j)rojecting mesiad (PI. XXXIV. f. 27), different in some 

 of the subspecies ; liarpe irregularly triangular, more or less pointed ; below the 

 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 spines 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 b}- the 

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



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

 plant : Salix. 



Chrysalis not described. 



Apparently two broods in the southern districts, the second most likely 

 irregular. 



Hub. Canada to Mexico, C'alif'ornia, and Vancouver Island ; not recorded from 

 Florida, Louisiana, or Texas. 



