Sphingidae 
Genus ISOGRAMMA Rothschild & Jordan 
This genus has been erected by Rothschild & Jordan for the 
reception of the single species which we figure. The learned 
authors say: “ In the shortness of the fore tibia and first segment 
of the fore tarsus the only species of this genus agrees with 
the species of Ceratomia, and in the preservation of the pulvillus 
with Chlcenogramma, while it differs from both genera in the 
fore tibia and the extreme apex of the mid tibia being armed 
with spines. The spinosity of the tibia is an advanced character, 
not acquired by Ceratomia , while the pulvillus is an ancestral 
structure already lost in Ceratomia.” 
(i) Isogramma hageni Grote, Plate IV, Fig. 8, $ . (Hagen’s 
Sphinx.) 
This obscurely colored hawkmoth, which is liable to be 
confounded with some of the species of Ceratomia, which it 
superficially resembles, may be distinguished at a glance by the 
slightly greenish shade of the primaries and by the absence 
of the dark-brown border of the hind wings, which is charac¬ 
teristic of all the species of Ceratomia. It occurs in Texas. 
Genus CERATOMIA Harris 
The tongue is reduced in size. The palpi are small. The 
eyes are small. The tibiae are unarmed. There is no comb 
of bristles on the mid tarsus, the pulvillus is absent, the 
paronychium is present. The primaries are relatively large with 
evenly rounded outer margin. The secondaries are slightly 
produced at the end of vein i b. 
The species have dissimilar larvae. In the case of amyntor 
the larva has four* horn-like projections on the thoracic seg¬ 
ments ; in the case of the other two species of the genus the 
larvae are distinctly and normally sphingiform. 
The tongue-case of the pupa is not projecting. 
(i) Ceratomia amyntor Hubner, Plate IV, Fig 6, ?. 
(The Four-horned Sphinx.) 
Syn. quadncorms Harris; ulmi Henry Edwards. 
This common hawkmoth, which may be easily recognized by 
our figure, lives in the larval state upon the elm. It ranges from 
Canada to the Carolinas and westward through the Mississippi 
Valley, wherever its food-plant is found. 
47 
