external margins of the wings are more rounded and fall than in any of our 

 other known species of Hemaris. 



Expanse, 1.50 inch. Length ofhody, .80 inch. 



Through Mr. Strecker I have received specimens from West 

 Farms, N. Y., and Berks County, Pennsylvania. 



Hemaris Thetis, Grote, Plate 1, fig. 7, primary Aving. 



Macroglossa Thetis, Boisduval, Ann. Soc. Ent. Fr. t. 3, troisieme Ser. Bull., 



p. 32, 1855. 

 Seda thetis, Orote and Robinson, Trans. Am. Ent. Soc. Vol. 1, Plate 6, 1868. 



This species is from California. It is larger than H. tenuis. The 

 marginal band of the primaries is even, black and very narrow. 

 The costal edge is depressed and the external margin of the fore 

 Avings is more oblique, uneven and longer than in H. tenuis. There 

 is no apical stain on the marginal band of the primaries. The 

 more robust Californian species may also be distinguished appa- 

 rently by the details of the abdominal coloration. It is described 

 and illustrated in Number 3 of our Descriptions of North Ameri- 

 can Lepidoptera, as above cited. Our specimen expands 1.80 inch. 

 A figure of the fore wing is given here for comparison. 



Hemaris diffinis, Orote, Plate 1, fig. 8, primary wing. 



Macroglossa diffiinis, Boisduval, Sp. Gen. Plate 15, fig. 2, 183G. 

 Sesia difflnis, Harris, Silliman's Journal, Vol. 36, p. 308, 1839. 

 ? Sphinx fuciformis. Smith, His. Ga., Vol. 1, p. 85, Plate 43, 1797. 



This species occurs in Canada, and at various localities in the 

 New England and Middle States. It may be considered infrequent 

 in the vicinity of Buffalo. Mr. Zesch has, however, taken it as it 

 hovered in day time about blossoms. My artist and my friend, Mr. 

 Henry S. Sprague, gives a figure of the fore wing so that it may be 

 compared with the other species here illustrated. In one example, 

 received from Mr. Strecker, where the lunulation of the external band 

 is hardly perceptible above, the character may be detected on the 

 under surface. 



