OF WASHINGTON. 83 
by him at the September, 1886, meeting of the Society. He had 
visited Rock Creek on May i, 1887, and found the larvae in all 
stages of growth, just as he had found them the previous August. 
He thought that the species remained at least two years in the 
larval state. 
Mr. Smith gave a brief review of the classification of the Smer- 
inthincz from the date of the creation of the genus Smerinthus by 
Latreille, showing how and on what characters it had been divided 
and subdivided, and explaining the characters used by the various 
authors. He criticised the most recent production of Mr. Grote 
on the subject, showing that Mr. Grote really worked in the dark 
and without any very distinct idea of what limitations to set to his 
genera. Except myops, every American species of the subfamily 
has been made a distinct generic type. He also gave a brief de- 
scription of the genital structure of the group which here, as else- 
where, gave valuable information as to the location of species. 
His arrangement, of which he gave a brief definition, would be as 
follows : 
Triptogon modesta. 
Smerinthus ophthalmicus. 
' ' cerisyi. 
" geminatus. 
Paonias excczcatus. 
u my ops. 
" astylus. 
C res so n la jugla n dis . 
Mr. Lugger presented a sketch of an entomologist, met by him 
many years ago in Detroit, Mich. , in which he described the unique 
collection made by that gentleman, and the method adopted by him 
to combine business and pleasure.* 
Dr. Marx spoke about the North American species of scorpions, 
of which about fourteen are known. He said the study of these 
animals was made very difficult on account of the poor descrip- 
tions by former authors and the numerous synonyms, which 
were very perplexing. The species known as Buthus carolini- 
anus, for instance, is neither a Buthus nor is it carolinianus. 
* This communication has been published by Mr. Lugger under the title, 
"An Entomological Curiosity," in Entomol. Amer., iii, pp. 83-84, 
