64 THE CANADIAN ENTOMOLOGIST. 



expanded. In order to come out they swim strongly upwards, and the 

 head breaking through the surface film, the body is forced out by vigorous 

 strokes. When the entire body has emerged it is still held by the surface 

 film, but the dorsum is dry, the velvety pile which clothes the insect 

 shedding the water. Now, by main strength, the legs are lifted free from 

 the prisoning film, and, when this is accomplished, a few strong heaves 

 and jerks liberate the body, and the bug once more glides over the water. 

 Under water Rhagovelia appears to be made of silver, owing to the large 

 quantity of air carried down by it enmeshed in its pile. 



Rhagovelia is predaceous in common with all the Gerrids, and feeds 

 on such insects as fall into the water, or on its own kind when there is no 

 other food. The winged form is very rare in this latitude, although it is 

 quite common in species from the tropics. The majority of the species 

 of this genus have incrassate hind tarsi in the male, in some cases out of 

 all proportion to the size of the bug. 



NEW SPECIES OF NORTH AMERICAN LEPIDOPTERA. 



BY WM. BARNES, S. B., N. D., DECATUR, ILLINOIS. 



(Continued from page 15.) 



Tricholita artega, n. sp. — Expanse, 40 mm. 



Fore wing reddish-brown, slightly hoary from a thin admixture of 

 whitish scales. Markings distinct though not contrasting, except white 

 scales on outer side of reniform and the pale orbicular. Basal half line 

 present, dentate, double, pale filled. T. a. almost transverse, scalloped, 

 double, pale filled. Median shade present though not promment, rather 

 darker brownish-red than rest of wing, as are the other lines. T. p. evenly 

 excerted beyond cell, thence in rather a straight line to inner margin, 

 scalloped between veins, the outer accompanying line barely indicated. 

 The pale filling between the lines is specially indicated on costa and inner 

 margin. Two or three pale points on costa beyond t. p. line. S. t. pale, 

 irregular, rather diff"use, preceded by a slightly darker shading. Veins, 

 especially through terminal and subterminal space, slightly darker. Fringe 

 yellowish-white at base, darkened outwardly. The wing is somewhat 

 lighter along costa and inferior portion of median space, from the increase 

 in number of white cells in these portions. Orbicular a somewhat round 

 yellowish spot, pale contrasting with ground colour. Reniform long, 

 slender, upright, with faint black ring, especially marked on outer side, 

 filled through outer half and lower end with white scales, the remaining 

 portion being of the ordinary ground colour. 



February. 1907 



