discoveries which the American student had ah*eady made and re- 

 corded. 



The next species of Hemaris described is from California. This is 

 Hemaris Thetis [Maci'oglossa Thetis, Boisd.), illustrated by onrselves 

 on Plate 6, Vol. 1 of the Transactions of the American Entomological 

 Society. A third species, Hemaris axillaris {Sesia axillaris, Grote 

 and Eobinson), is described by ourselves in 18G8 from Texas. 



As in Ilaemorrhagia, good specific differences are also to be found 

 in the shape, size and comparative Avidth, of the band on the exter- 

 nal margin of the primaries in the species of Hemaris. The inner 

 edge of this band in H. diffinis is very slightly roundedly and evenly 

 exserted or scalloped on the interspaces. This character is shown 

 in Boisduval's figure, with which specimens before me from Massa- 

 chnsetts to Pennsylvania otherwise sufficiently agree, and is decisive 

 of what species is really intended. I do not think that either Clemens 

 or Harris have mistaken Boisduval's and our most common spe- 

 cies, so that a redescription is unnecessary. But I here indicate the 

 existence of two new species in onr territory, that may be separated 

 from H. diffinis, by the shape and comparative width of the marginal 

 band. We must remember H. diffinis as a species of good size, the 

 apex of the primaries with a red stain on the marginal band, and 

 with the inner edge of this marginal band improminently lunnlate, 

 neither dentate, nor perfectly even. The dark scale patch on the in- 

 ternal margin of the hind Avings is nsually stained with red in H. 

 diffinis. 



Hemaris tenuis, Grote, Plate l,fig. G, primary wing. 



6 2 . — Pale yellowish, and black. Tlie two bluisli wliite lateral abdominal 

 spots evident against tbe blackish hairs of the basal segments, which latter 

 are dorsally yellow. Anal tuft black, divided by yellow central hairs. Be- 

 neath, some sparse yellow hair overlies the nsual black abdominal vestiture. 

 Legs black ; pectus pale yellowish white ; palpi above black, beneath pale yel- 

 lowish. Wings largely vitreous, with very narrow, dull blackish borders ; 

 blackish at base as usual, and partially overlaid with yellowish scales. Costal 

 edging narrow ; the band along external margin is even on its inner edge and 

 narrower throughout than in any species hitherto described from the Atlantic 

 District. There is no percei^tible red apical shading. The body squamation 

 is rather rough, and in size it is the smallest of our si:)ecies j^et described. The 



