Catalogue of North American Sphinges. 289 



Family Y.' — Zygaeniadas. 



Antenna3 arcuated, abruptly thickened and curved beyond the middle. Palpi 

 generally elongated, sometimes short, not pressed to the face, hairy at base, with 

 the terminal joint scaly or almost naked. Wings narrow, opaque, often spotted, 

 the hind-pair rather small. Abdomen more or less cylindrical, obtuse, and not 

 tufted at the end. Flight diurnal. Larvaj short, contracted, variegated with spots, 

 slightly hairy, and not horned on the tail. 



Genus XIV. — Mastigocera. 



Wings long, narrow, entire, opaque, the hind-pair quite small. Antennae simple 

 in both sexes, filiform at base, suddenly thickened and fusiform beyond the middle, 

 very much attenuated towards the tip, and ending in a long curved point. Labial 

 palpi somewhat curved, extending considerably beyond the clypeus, separated, 

 well covered with hairs beneath the base; the penultimate joint longest, cylindri- 

 cal, and scaly ; the last joint also cylindrical, obtusely roun Jed at the end, and cov- 

 ered with small, close scales. Maxillge (tongue) nearly as long as the body. Ab- 

 domen nearly cylindrical, obtusely rounded at the end, longitudinally grooved at 

 the sides before, with the basal segment strongly marked, and swelling on each 

 side into a little tubercle. Legs long and slender ; posterior tarsi laterally com- 

 pressed, and hairy on the outside, in the males. 



Family YI. — Glaucopididce, 



Antennae slender, almost setaceous, or very slightly thickened in the middle, and 

 distinctly bipectinated beneath in the males. Palpi slender, more or less elongated, 

 not pressed to the face. Wings sometimes narrow, and sometimes widened, en- 

 tire, and for the most part opaque. Abdomen nearly cylindrical, and frequently 

 tufted at the end. Flight diurnal. Larvce cylindrical, hairy, without a caudal horn. 



Genus XY. — Procris. 



Wings narrow, elongated, opaque, and immaculate. Antennae slender, tapering 

 at each end, and bipectinated beneath in the males. Palpi small, short, pendent, 

 and nearly naked. Tongue short, but distinct, and spirally rolled. Abdomen 

 slender and nearly cylindrical in the males, thicker in the females, and tufted at 

 the end. Spurs of the hind tibiae two in number, and very minute. 



Genus XYI. — Glaucopis. 



Wings iiarrow in some, broad in others, entire, for the most part opaque, and 

 with the body more or less glossed with blue, sometimes spotted or partially trans- 

 parent. Antennae feathered or bipectinated in both sexes, the pectinations elonga- 

 ted in the males, and short in the females. Palpi more or less elongated and re- 

 curved. Tongue moderate, spirally rolled. Caudal tuft minute or wanting in the 

 greater number. Posterior tibiaj with three or four spurs of moderate size. 



From this Synopsis it will be seen that the divisions and arrangement which I 

 have adopted, differ somewhat from those of the entomologists of the present time. 

 The affinities or resemblances of the Lepidoptera, in their different states, are so 

 various, that it is impossible to preserve a natural connection between them in a 

 linear series. After repeated trials, I have concluded still to adhere to the views 

 of our great masters in Entomology, Linnaeus and Fabricius, especially as modern 

 entomologists are by no means agreed upon the limits of the larger divisions of the 

 Lepidoptera, and the order of the genera. 



Vol. xxxvi, No. 2.— April-July, 1839. 37 



