288 NEW YORK STATE MLSEUM 



Dark elm bark borer 

 Hylcsiiins opaculiis Lee. 

 Making small, pinholelike perforations in elm, particularly diseased hark in August 

 and September, a minute, cylindric, dark brown bark beetle about '/o inch long, its wing 

 covers marked with dec])ly im|)rcssed, jjunctured furrows and bearing short hairs. 



This species mines under the <^reen bark of ehns, particularly those in 

 a sickly or tlyin^f condition. It is not, as a rule, injurious. 



Description. This beetle has been described ijy l)r LeConte as follows : 

 " Cylindrical, brownish black, opaque, thinly clothed with short stiff yellow 

 hairs; antennae and feet ferruijinous ; head convex, thickly punctured; 

 prothorax nearly as long as wide, narrowed in front, side subsinuate near 

 the tip ; densely but not finely punctured, with a very narrow faint dorsal 

 carina ; elytra with striae composed of deep subquadrate punctures, inter- 

 vals narrow, rough with transverse rugosities." The antennal structure is 

 shown on j)late 67, figure 6. 



This species has been recorded from the Middle -States and Pennsyl- 

 vania by Dr LeConte, and Dr Smith lists it from New Jersey, where it is 

 said to mine the green bark of elms. 



Ash timber beetle 

 I fylcsi)iHS aculcatus Say 



A small, browiiisli, ratlu-r stout, cylindric beetle bores ( ommonly in freshly cut ash. 



This species is our most common ash l)orer, and specimens may be 



found whcrc\cr ash posts have been split in the s|)ring of the year. The 



main adull burrow is usually exca\'at((l in tlu- inner bark and sapwood by 



two femaKs working in o])])osilc ilirections from llic entrance point, which 



latti-r is usually iniiicated by a slight notch. The compound main gallery 



is from about i inch to nearly 4 inches in length, and eggs are deposited at 



short intervals on each side, young larvai' making their gradually dilated 



burrows at approximately right angles to the ])arental groove. The lateral 



burrows arc from about ^ to nearly 2 inches in length. 



Description, This beetle has been describt-d by Zimmerman as follows : 

 "Of the same form as the European 11. fraxini but smaller; blackish 

 brown, thickly clothed with ver\- short ashy squamiform hairs; antennae 



