OF WASHINGTON. 93 
SatUrniidce, while the Sphingidce are allied rather to the Ptilo- 
donts. He gave a brief history of classification, with the special 
view of demonstrating the error of English and many American 
authors in the use of the term Sesia, and, finally, remarked on some 
of Boisduval's descriptions of Sphingidce from drawings and the 
difficulty of positive identification. 
Mr. Schwarz made the following additional remarks on the 
Coleopterous fauna of Key West : 
The Mangrove belt which encircles the island is composed chiefly of 
three species of tree-like shrubs, the Black Mangrove (Avizennta nitida}, 
the White Mangrove (Laguncularia racemosa}, and the Buttonwood 
(Conocarpus erecta}. Thk last is the only food-plant of Chrysobothris 
impressa * which would be greatly destructive if the wood would serve 
any other use besides fuel and the manufacture of charcoal. Chrysobothris 
chryscela is also extremely common in this tree, besides several species of 
Leptostylus, among them argent at us. Elaphidion cinereum and Neoclytus 
devastator also develop in the branches of Conocarpus, but are not con- 
fined to that tree. The last-named species is one of the most common in- 
sects on Key West and breeds in all sorts of the harder forest trees. On 
the Black Mangrove I never was able to find any insect whatever, except 
a Cecidomyious gall on the leaves. The White Mangrove is the food-plant 
of Elaph idion irroratum. This species occurs in North America, in my 
experience, only along the coast of southern Florida, and I seriously doubt 
the correctness of the localities, " Illinois" and " New York," as given in 
Mr. Leng's Synopses of Cerambycidce (Entom. Amer., i, p. 32). 
The largest and most striking tree in the " hammock" is the Gumbo 
Limbo tree (Bursera gummifera), but no Coleoptera or Lepidoptera were 
found to feed on the leaves. The only Scolytid which burrows in the 
trunk proved to be the common and widely-distributed Xyleborus fitscafus, 
while big holes often seen in the trunk prove that the tree has been inhab- 
ited by a gigantic Cerambycid {Stenodontes maxillosus) . Under bark of 
decaying trees numerous specimens of the genera Ditoma, Silvanus, 
Lcemophloeus, Smicrips, Bactridium, Cossonus, etc., are met with, among 
them several undescribed species, or, more correctly speaking, West In- 
dian species, hitherto not known from the United States. 
The fig-trees on Key West are, owing to their stunted, shrub-like growth, 
much less inhabited by insects than they are on Biscayne Bay or the larger 
Keys ; but, under the bark of a species of Ficus (probably pedunctilata}, 
which I saw only on Key West, I found great numbers of a remarkable 
new Thysanoes. Spalacopsis stolata, Methia pusilla, various Elaphid- 
*I take this opportunity to correct a lapsus calami of mine in a hastily 
written postal card, which has unfortunately been published by Mr. Smith. 
(EntomoL Amer., iii, p. 39). In this card Chrysobothris impressa should 
be substituted for Ch. chalcophoroides. 
