OF WASHINGTON. 149 
ON THE TYPES OF TOMICUS LIMINARIS, HARRIS. 
BY E. A. SCHWARZ. 
APour meeting held in December, 1887 (p. 113),! expressed my suspicion 
that Dr. Harris had probably confounded Phloeotribus liminaris and Hy- 
lesinus opaculns in his description and account of the former species. I 
came to this conclusion from the fact that Harris mentions Peach and Elm 
as the food-plants of his species, whereas, in my experience, the species 
under Elm bark is Hylesinus opaculus. I was, of course, unable then to as- 
sert positively that Harris had confounded these two species which so 
closely resemble each other, but, through the kindness of Mr. Samuel 
Henshaw, I had lately the opportunity to examine Harris' type of P. limi- 
naris, and I also received through him a transcript of Harris' notes to the 
numbers in his cabinet. Harris had three specimens under the name of 
Tomicus liminaris, and his notes thereto read as follows : 
" No. 521. Miss Morris finds it in bark of Peach trees, and thinks it the 
cause of Yellows ; imago in August and September. 
"No. 821. Mr. Leonard, 2 [February?], 31, Dublin, N. H., No. 307. 
" No. 1007. Under bark of Elm, Milton [Mass.] " 
Specimen No. 521 is the true Phlceotribus liminaris ; No. 821 is Poly- 
graphus rufipennis. How Dr. Harris came to place this among his Tomi- 
ctis liminaris is more than I can explain. No. 1007 is undoubtedly Hyle- 
sinus opaculus, and proves that my suspicion was well founded. 
It may be of some interest to append here Dr. Harris' notes on the other 
species of Scolytidce in his collection, a copy of which I owe to Mr. Hen- 
shaw : 
"Platypus compositus Say. No. 1278. North Carolina, Mr. Hentz, No. 
521, March and Ap.ril. 
" Tomicus pint Say. No. 742. October i, 1823, on White and Pitch Pine 
under bark; August 5-30, 1832. 
^ Xylebortis xylographus Say. No. 744. May 30, 1822, ami North Car- 
olina, Mr. Hentz, No. 511, September. 
" Xyloterus politus Say. No. 1008. Milton, May i, 1829; Cambridge, 
May i, 1833; Ohio, Mr. Ward, No. 361. 
" Hylesinus aculeatus Say. No. 1387. Cambridge, August 28, 1832, and 
Randall ; Alabama, February, Hentz. Prof. Haldeman found it in May in 
bark of Fraxinus acuminata." 
JUNE 5, 1888. 
Nine members present. President Schwarz in the chair. 
Prof. Riley read the following paper : 
