OF WASHINGTON. 143 



oviduct, joins this cross-bar, and also fills the space between each 

 branch and its corresponding spiculum. The alternate motion 

 of the spicula would seem to require just such a subsidiary sclerite, 

 and I have no doubt that something homologous with it will be 

 found to occur in the case of most hymenopterous insects. 



The see-saw motion of the spicula could be easily seen to result 

 from the partial rotation of the spicule plates (shown in part at 

 upper corners of figure), in alternation, on the supports of the 

 ovipositor. 



Mr. Heidemann exhibited specimens of the following species of 

 interesting and rare Hemiptera, found near Washington, D. C. : 

 Abedus ovatus Stal., Zaitka anura H. Schf., Ambrysus pudi- 

 cus Stal., Hygrotrechus robustus Uhl., Hygrotrechus pro- 

 diictus, Brachymetra albinervis Am. & Serv. 



Mr. Schwarz presented the following : 



DESCRIPTION OF THE PINE-CONE-INHABITING SCOLYTID. 

 By E. A. SCHWARZ. 



The discovery of a Scolytid infesting pine cones is due to Mr. 

 W. H. Harrington, whose observations were first published in 

 Dr. Packard's Report on Forest Insects, p. Sio, and subsequently 

 in Can. Ent., 23, 1891, p. 26. The insect is doubtfully referred 

 by him to Dryoccetes affaber or D. autographus, and seems to 

 have been collected near Ottawa, Can. What, no doubt, is the 

 same species was observed some years afterwards by Dr. John 

 Hamilton at Sparrow Lake, Ont., and a short note is published 

 by him in Can. Ent., 25,^893, p. 279. Dr. Hamilton, as well 

 as Prof. A. D. Hopkins, to whom specimens were submitted, 

 came to the conclusion that the species was both specifically and 

 generically different from D. affaber. Having lately seen speci 

 mens bred from pine cones by Dr. Hamilton, I recognize in them 

 a species which, in 1877, was sent by Mr. Hubbard and myself, 

 with many other Lake Superior Scolytids, to Dr. LeConte, and 

 named by him Dryoccetes affaber. It is evident that a confusion 

 of numbers or specimens must have taken place, but, strangely 

 enough, this confusion seems to have spread to various other col 

 lections. The reasons why this species has not been described 

 by LeConte in the Michigan List or any subsequent publication , 

 I cannot explain. 



I off er herewith a description of the species, being solely tempted 

 thereto by the interest attached to its life-history ; for, as far as I 

 am aware, there is no other Scolytid known which normally de 

 velops within the cones of pine trees. 



