( 340 ) 



(the piiints directed basad) and foriuiug the outer border of the dark band or band- 

 like area, the third line also crenate, more distal. In Pachijsphinx we meet with 

 the same lines, the second (within the dark band) being, however, always absent 

 and the tliird seldom obvious ; the fourth and fifth are crenate as in Amorpha. In 

 Sphinx the homology of the lines is obscured. The hindwing of I'achi/sjikinx, 

 tiiough so similar to that of Sphinx kiiidermanni, reminds one nevertheless of 

 Amorpha populi by the red colour being intensified subbasally behind the cell, 

 forming here a patch corresponding to the tawny jiatch of popnli. The red basal 

 area on the forewing below is a <SyVi'/«.r character. In structure Fach>/,sj/hi»x a,grees 

 with some sj)ecies of Sphinx in possessing a claw at the end of the foretibia, and 

 with Amorpha in tlie more strongly spinose abdominal tergite and the bilobate 

 harpe. The penis-sheath is similar to that of Amorpha in being devoid of a conical 

 tooth, while it differs from botli Amorjiha and Sphinx in being very slender, and 

 having instead of a number of spines a single tooth as armature of the membrane 

 of the duct. The frenulum of the S is as much reduced as in Sphinx. 



280. Pachysphinx modesta. 



Smerinthus modesta Harris, in Sillim., Jonni. Sci. Art xxxvi. p. 292. d. 6 (1839). 



Smeriiilhiix inodeslus (!), Wallser, List Leji. Ins. B. M. viii. p. 248. n. 10 (185G). 



*Siiierinthuii priiirejia id.. I.e. p. 22.5. n. 21 (1856) (Mus. Brit.). 



Ijinlhue modestux, Grote, Bnll. Biifiilu Sen: N. Sri. i. p. 24 (1874). 



Siui'riiithiis pnpiillcDln Boisduval, Spec. Gin. Lip. llet. i. p. 22. n. 9 (1875) {num. nor.). 



Amorpha modesta, Grote, I.e. ii. p. 227. n. 44 (1875). 



Triptogoii modesta, Butler, Tratis. Zool. Soc. Loud. ix. p. 589. n. 28 (1877) ; Grote, I.e. iii. p. 223. 



n. 45 (1877). 

 Smeriiilliiis oeeiilentalh var. Edwards, Calif. Ac. Nat. Sci. vi. p. 92 (1876). 

 Smerintliiis cablei Reizenstein, in Serilmer's Monthlij xxii. p. 864. fig. (1881). 

 Marumba modfsta, Kirby, Cat. Lep. Het. i. p. 708. n. 33 (1892). 



S- Antenna long, strongly compressed, slightly dilated laterad as in Sphinx 

 ocellata, ciliae long. Tenth abdominal tergite stronger chitinised than in Sphinx ; 

 the sternite much broader than in Sphinx and Amorpha, with almost parallel sides 

 (PI. XXII. f. 13). Clasper dilated dorsad at ape.x, very broad (PI. XXII. f. 13); 

 harpe large, ventro-distally jiroduced into two lobes ; the dorsal edge of the harpe 

 raised into a broad lobe, which is rough with short pointed tubercles and teeth. 

 Penis-funnel short, without process ; penis-sheath comparatively slender and weak 

 (absolutely slenderer than in the much smaller species of Sphin.r), without external 

 armature ; the membrane of the duct strongly chitinised in a small place, armed 

 with a more or less prominent solid tooth, which is visible through the sheath as a 

 black spot, if the duct is not pushed out (PI. XXIX. f. 37). 



?. Antenna thin ; jiroximal edges of the segments feebly raised, dorso-lateral 

 e.vpansions of S barely vestigial in ? ; a pro.\imal series of very slightly prolonged 

 ciliae, surface of segments feebly concave laterally and ventrally. Eighth abdominal 

 segment rather strongly chitinised, brown ; antevaginal portion of plate short 

 (PI. XV. f. 17), the ridge thick. 



llab. Nearctic Region. 



There are three subsjjecies : 



{modesta : Eastern States ; Canada to California ; 

 imperator : Arizona ; 

 ri'yiilis : Mexico. 

 Judging from our Arizona material obtained from Dr. E. Kunze and E. J. 



