90 DR. HARRIS'S REPORT. April, 



quently enters houses at night, from the middle of July to Sep- 

 tember. 



In Lamia^ the head is vertical, or forms a right angle with the 

 thorax ; the antennae are longer than the body ; the thorax is gene- 

 rally cylindrical, and tuberculated or spined at the sides ; the last 

 joint of the palpi or feelers is not much thickened, or is nearly 

 cylindrical. 



The larvae are white and elongated ; their bodies are composed of 

 thirteen segments, each of which is distinct and swollen ; the head is 

 horny ; and they have six small feet. They remain two or three 

 years before becoming pupae. 



Lamia tilillator is one of our largest species ; the habitat of the 

 larva is unknown to me ; the perfect insect occurs in woods. 



The genus Saperda has the head and antennae like those of Lamia, 

 but the thorax is smooth, perfectly cylindrical, and destitute of spines 

 or tubercles. 



Saperda calcarata inhabits the poplar, and greatly resembles, in 

 size, form and color, a European species, appropriated to that tree. 

 This insect, together with Prionis brevicornis, has almost destroyed 

 the Lombardy poplar of this vicinity, which is perforated in various 

 directions by their larvae. The perfect insect is disclosed in August. 



The full-grown larva measures nearly two inches in length, and is 

 of a yellowish white color, except the upper part of the first segment 

 which is of a deep buff. Its body is nearly cylindrical, rather thick- 

 er before than behind, and consists of twelve segments, separated 

 from each other by deep transverse furrows; the first segment is cov- 

 ered above by a broad buff-colored plate or thoracic shield ; the sec- 

 ond segment is very narrow ; on the upper and under sides of each of 

 the following segments, from the third to the tenth inclusive, is a trans- 

 verse space, rendered rough like a rasp by minute projections. 

 These rasps, on the upper and under sides of the body, serve instead 

 of legs, which are entirely wanting. 



The most notoriously noxious insect of this genus, is the Saperda 

 bivitlata, the parent of the apple-tree borer. The trees and shrubs 

 principally attacked by this borer, are the apple-tree, the quince, 

 mountain ash, hawthorn, medlar, and several species of Aronia. In- 

 digenous plants of this genus, called June-berry and choke-berry 



