844 FIFTH REPOKT OF THE ENTOMOLOGICAL COMMISSION. 



close-set fine hairs. The hairs on the sides of the prothorax inclose a conspicuons 

 black spot, while the top is black, and more coarsely punctate than the wing-covers. 

 The latter are each crossed by four acutely zigzag lines, composed of microscopic hairs, 

 forming' VV"1'^6 ^'^'^'1^ o" ^^® elytra, the basal lines being less distinctly marked 

 than the others. The ends of the wing-covers are also tipped with gray, especially 

 on the inner side of the end. The legs are pitchy brown with light hairs, and with 

 a reddish tinge on the terminal joints (tarsi). It is a little over half an inch long. 



3. The noble clytus borer. 



Calloides nobilis (Say). 



A longicorn borer, probably depredating upon the chestnut, and transforming to a 

 large, handsome, black-brown beetle, nearly an inch long, marked with three broken 

 yellow lines and a pair of large round yellow dots on the wing-covers. 



Mr. George Hunt informs us that he has found this noble Clytus 

 under the bark of the chestnut at Providence ; hence it occurs as a 

 borer of this tree. Its food-tree has not heretofore been known. 



4. The two-toothed silvan us. 



Silvanus bidentatus (Fabricius). 



Order Coleoptera ; family Atomariid^. 



Under the bark of logs and decaying trees, probably loosening the bark from the 

 wood, a minute, narrow, flattened beetle, of a light chestnut brown or rust-color, its 

 thorax longer than wide, slightly narrowed towards its base and with a small tooth 

 projecting outwards at each of its anterior angles. Length, .10 to .12 inch. (Fitch.) 



Fitch observes that this is an European insect, which, like a kin- 

 dred species, the Surinam Silvanus, has now become perfectly nat- 

 uralized and as common throughout the United States as it is in its 

 native haunts. On stripping the bark from recently cut logs of 

 chestnut and of oak, this minute beetle, which is so flattened and thin 

 that it can creep into the slightest crevices, will be found frequently 

 in <;onsiderable numbers. 



The beetle. — fhe head and thorax often of a darker shade than the wing-covers ; the 

 latter with rows of close punctures with a slightly elevated line between each alter- 

 nate row. Its thorax also is densely and confluently punctured, and commonly shows 

 a very faint elevated longitudinal line in its center. The angles at its base on each 

 side are obtuse, and from these angles forward to the projecting tooth the lateral 

 edges are crenate-dentate, having sixteen little elevated tubercles or minute teeth 

 jutting out at equal distances along the margin. The point of the large anterior tooth 

 forms a right angle. Upon each side of the head behind the eye is also a minute 

 tooth of the same size with those along the sides of the thorax. The surface i& 

 slightly clothed with minute inclined bristles. (Fitch.) 



AFFECTING THE LEAVES. 



5. The notched-winged geometer moth. 



Eugonia alniaria Hiibner. 



Order Lepidoptkra ; family Phal.enid^. 



Feeding on the chestnut, a bluish-green caterpillar, with wrinkles, and on the 

 eleventh segment two little warts tipped with brown; transforming to a light ocher- 

 yellow moth with wings deeply notched. 



