35- ^^EVV YORK STATE MUSEUM 



while pines at Round Lake X. Y. in the summer of igoi. The tlestructive 

 work of this little Ijorer was further evidenced b)- a comijlaint from Jeremiah 

 I)a\-, Catskill X. V., Decemljer 1901, to the effect that 50 \oun<^- white 

 jMnes about 25 or 30 years okl had been killed during- the precedino- summ.er 

 and the examijles ol the injured bark pro\-ed that tliis species was the dep- 

 R'dator. It is very evident that this little Ijorer can serious!)- injure if it 

 does not kill a tree outriyht. It was met with on pine and tamarack at 

 Bio- Moose X. v., Jul)- S, 1903, evidentl)- attracted to the recentl)- l)urned 

 trees. 



Description. The beetle is sliyhtl)- larger than Tomicus c a c o- 



graphu s Lee, bein^- aliout 5 „ inch lon^- and usuall)- a little stouter. It 



-3s--^-'tn?^^^ varies in color, like the precedino', from a lio'ht to a 



:^'^'vi^< .""v* *- very dark brown. One of the most ijrominent char- 



>^ •'^S'-''^*'***^ ' actenstics of this species is the presence of but four 



f 7 . '," / teeth on each side ()f the conspicuous posterior exca- 



\.^' " vation or declivity of the elytra. They are arranijed 



as follows: the dorsal o:ie near the i-nediai-i line is 



Fiij. 70 Declivity of Tom i c II s 



j.iiii i..n.h.,r-siiiu«ratinni uiiiiute aud souit ' 1 1 ui I "s wautlni^^ in the female; the 

 second ai-id third are laroer, speciall)- the latter, and touchino- at the base; 

 the fourth is n-iuch smalU-r and independent. The prothorax is rather 

 coarsely o-ranulated and the elytra or wino- covers are ornamented with 

 loiioitudinal rows of rather small i)ui-ictures. The antcnnal structure is 

 shown OI1 i)late 66, fio-ure 7 and that of the tilna in figure yia. 



Life history and habits. The t)-pical form of the burrows of this insect 

 is well shown ii-i ])Iate 57, figure 3, which rejjresents the central or entrance 

 chamber ai-nl ai"! adult gallrr\-. The latter is aliout ' ,„ inch in dianieter, and 

 leading therefrom are somewhat tortuous expandii-ig larval mines, rarely 

 more than ' ., inch in length. The specimen of Ixvrk [jhotographed shows 

 also th(_- work of what is probabl)- a )-oLnig Monohammus lar\-a. It will be 

 -seen 1)\- an examii-iatioii of this figure that, in this case at least, two females 

 conlii-iurd their work from the central chamber, one going up and the 

 other dc^vn a[)[)roximatel\- parallel with the bark tilx-rs. A more atlvanced 



