90 JOHN B. SMITH. 



I have nothing to add to this as the species is unknown to me. It 

 is pi'obalily nothing more than a variety of thetis. 



H. ihetis Rd., Aun. Eut. Soc. Fr. iii, ser. 3, Bull. p. 32, 1865. Macroglossa ; G. & 

 R.. Pr. E. S. Ph. V, 192, MacroiiJossa ; Tr. A. E. S i, 325, pi. vi, fig. 36, Sesia ; 

 E(l\v., Pr. Cal. Ac. Sci. vi, 87, Mucroglossa ; Grt., Buff. Bull, i, 5, pi. 1, fig. 7, 

 Hemaris; BA., Sp. Gen. Het. i, 368, Macroglossa ; Butl., Tr. Zool. Soc. Lond. 

 ix. 519, Hemaris. 



Size and form of »9. diffinis. Head above dull olivaceous; eyes narrowly cir- 

 cled with white scales ; labial palpi yellowish beneath and on the sides, tipped 

 with ferruginous inwardly and with superior, lateral, black scales tipping the 

 terminal joint. Antennae rather stout, blackish ; beneath, the thoracic parts are 

 clothed with pale yellowish scales, as are the anterior femora outwardly. Legs 

 bhick. The thorax beneath is encroached upon centrally by the pale pectoral scales, 

 but is elsewhere black ; above, it is entirely obscure olivaceous. Abdomen above, 

 black, shaded with brownish from over the base downwardly; the two pre-anal 

 segments are entirely pale yellow, except centrally beneath, while dorsally the 

 pale yellow scales are narrowly tinged with brownish. Anal segment and tuft 

 black. Wings largely vitreous ; anterior jiair narrowly clothed with dark brown- 

 ish scales along costal edge; an unusually narrow terminal band tapering to in- 

 ternal angle ; a basal scale patch below median nervure outwardly obliquely bent 

 on internal margin. Secondaries largelj^ vitreous; a very narrow, even, terminal, 

 dark brownish edging ; from the base downward the internal margin is broadly 

 clothed with dark scales ; beneath as above ; the wings at base are partially 

 clothed with pale yellow scales. Expands 1.80 inches ; 45 mm. 



Hab. — California. 



The above description is from Grote & Robinson ; they say : 

 "This species closely agrees in structure with S. diffinis; the body 

 squammation is rough. The coloration of the body parts and the 

 narnnv edging of the wings, will at once distinguish the present from 

 our common species from the Atlantic district." 



In Butf. Bull, i, 5, Mr. Grote compares the species with tenuis, 

 than which he says it is larger, " marginal band even, black and very 

 narrow. Costal edge depressed, external margin more oblique, un- 

 even and longer than in tenuis. No apical stain on primaries. The 

 more robust California species may be distinguished by details of 

 abdominal coloration. 



Mr. Edwards in Pr. Cal. Ac. Sci. vi, 87, says that in fresh speci- 

 mens there is always present on the hind tibia a bunch of long, pale 

 vellow hairs, which are not visible in the somewhat worn and faded 

 type specimens. " The presence of the reddish apical spot in the 

 anterior wings is, I think, by no means a safe character, as in any 

 one of my specimens it is quite apparent, while in two others it is 

 entirely absent. This species may, however, be known by the tho- 

 racic and abdominal clothing, which is invariblv dull olivaceous, 



