OF WASHINGTON. 79 



leries in which the larvae develop. One of these branch gal 

 leries measured 12, and a second more than 20 mm. in length. 

 At several points within the main and lateral galleries are 

 short (from 5 to 8 mm. in length) vertical galleries, made by 

 the beetles to reach a lower level from which to construct 

 another story of horizontal galleries. The largest piece of 

 wood cut from the stump shows three stories of galleries, and I 

 presume that in this instance several specimens of female 

 beetles participated in the work of excavation. The work of 

 these two Xyleborus closely resembles that of the European 

 X. dryographus, as described and figured by Eichhoff. Large 

 numbers of Hypophlceus thoraticus were found among the 

 Xyleborus, and no doubt depredate upon their larvae. 



I may add that in the same stump a single male specimen 

 of the rare Xyleborus planicollis was found (unfortunately not 

 recognized at the time of collecting), and that Mr. Ulke found 

 therein a colony of Dryoccetes granicollis, but no notes were 

 taken of its' mode of work. 



CNESINUS STRIGICOLLIS. This is a widely distributed 

 (occurring from Michigan to Florida and Texas) though not 

 very abundant species, and probably not of economic import 

 ance. Of its food-habits I find nothing recorded excepting a 

 short note by Dr. Hamilton (Can. Ent., 19, 1887, p. 66), 

 stating that the species ' ' occurs here [Allegheny, Pa.] on 

 Osage Orange, which it probably followed from the south." 

 At Columbus, Texas, it occurred exclusively on the "Gum 

 Elastic tree " (Bumelia lanuginosa], while near Washington I 

 found it last July and August on a felled Black Gum (Liqui- 

 dambar styraciflua] . As often as I passed the tree I beat quite 

 a number of specimens from it so that I felt confident to -find 

 the burrows of the Scolytid in the tree. I went to work tear 

 ing off the bark, but since the tree was quite large and the 

 bark most tenaciously adhering I made but little progress. 

 Finally, I noticed from a small hole in a branch about 30 mm. 

 thick some sawdust dropping and ascertained that this was 

 pushed out by a Scolytid, which proved to be a female of 

 Cnesimis. A cross section through the branch revealed a 

 gallery which, after piercing the bark, entered the wood for a 

 distance of nearly 6 mm., and then abruptly bending followed 

 an undulating course parallel to the bark, the whole length of 

 the gallery being 17 mm. and its terminal point 5 mm. from 

 the outer surface. There was no trace of secondary or branch 

 ing galleries, nor of eggs or larvae. That this burrow had 

 been excavated by the Cnesinus there can be no doubt, but it 

 is either incomplete or made by the beetle only for the pur 

 pose of feeding on the wood. I am inclined to believe the 



