To some extent intermediate between the Macroglosscz and the 

 Sphinges are three genera which are aberrant wherever placed. 



Amphion, Aellopos and Thyreus have no special relationship except 

 in the tufted abdomen. There is always a prominent anal tuft, and usu- 

 ally there are more or less distinct lateral tuftings. The tongue is strong 

 and the antenna; are not clubbed. 



Amphion is perhaps nearest to Macroglossa and has a similar body 

 form; the ornamentation is also similar, but the primaries are excavated 

 below apex, and again below middle, and the hind angle is somewhat 

 prominent. The single species, nessus, is a very pretty one, with a nar- 

 row, clear yellow band across the abdomen. 



Aellopos is somewhat depressed. The head is much more prominent 

 than either of the preceding, the antenna; are remarkably slender, almost 

 setaceous, with a small recurved hook at the tip; the thorax is narrow, 

 the primaries inserted well back, and the abdomen is long, broad, ob- 

 tusely terminated, and the tip is furnished with a fan like tuft. The 

 primaries are narrow with even, very oblique outer margin. The narrow 

 thorax well produced before the insertion of wings, and the narrow pri- 

 maries, recall Dilphonota . 



Thyreus is a very peculiar form, with strong Smerinlhid tendencies, 

 but long corneous tongue. The $ antennae are thickened and serrate, 

 the head is not prominent, the body is plump, convex, and the abdomen 

 short, very broad and obtusely terminated. The anal tuft is pointed and 

 the lateral tufts, extending nearly to middle are round and truncate. 

 The primaries are excavated below apex, angulated at middle and again 

 excavated above the hind angle. The Smerinlhid features are prominent 

 but not more so than the characters which lead to its association with 

 Amphion. 



Enyo is a very recognizable form, distinguished by the prominent 

 thoracic crest. The primaries are narrow, but else very much as in the 

 preceding. The abdomen is elongate, conic, with a fan like tuft, distinct 

 in the $ only The distinctly crested thorax is unique in the N. A. 

 Sphingids and serves to isolate the genus at a glance. 



The series of typical Sphinges may be headed with the genus 

 Sphinx which includes Daremma, Diludia, Phlegethonlius {Macrosild) 

 Dolba and Hyloicus of Mr. Grote's list. 



The characters common to all these, are oblong, or subquadrate 

 thorax, the primaries inserted well forward, the head moderately promi- 

 nent, the abdomen conic, robust, primaries with even, somewhat round- 

 edly oblique outer margin, sometimes with the anal angle somewhat 

 marked. The legs are long and strong, the fore tibiae moderate in length, 

 robust, and usually furnished with a series of claws or stout spines at 



