DESCRIPTION OF THE SPECIES. 299 



the anterior edge of the oral opening ; proboscis not geniculated. 

 The ground color of the upper side of the thorax is black, but, in- 

 consequence of its pulverulence and of its short, yellowish pile, it 

 appears gray ; upon its anterior margin, in the vicinity of the 

 yellowish humeral callus, there are some blackish hairs ; the 

 ordinary bristles, of which I perceive only two pairs upon the 

 middle of the dorsum, are brown. The lateral margin of the 

 thoracic dorsum is yellow ; scutellum yellow, with four bristles. 

 Metanotum and pleura? blackish-brown ; the latter rather shin- 

 ing; the bristles upon them for the most part black. The ground 

 color of the abdomen is yellow ; it has four rows of brownish- 

 black spots, which begin to expand upon the third segment; upon 

 the fourth and the following segments they coalesce in such a 

 manner that the segments appear altogether blackish-brown. The 

 pile upon the abdomen is generally whitish-yellow, but upon the 

 black spots it is black ; the bristles upon the posterior margin of 

 the posterior segments are generally black. The rather broad 

 ovipositor is of a shining blackish-brown, flattened, although 

 somewhat swollen at the basis; its short and very delicate pile 

 is not easily discernible ; it seems to be brownish. Femora 

 brownish-black, the anterior ones with long black bristles ; the 

 extreme root and the tip dark yellow. Tibia? and tarsi rather 

 dark yellow ; wings of the ordinary shape, blackish-brown, 

 sparsely guttate ; the root of the wings, almost as far as the tip 

 of the small basal cells, is rather hyaline and almost altogether 

 immaculate ; the alula also, bears no spots and is without dark 

 coloring; the brown coloring begins on the anterior margin about 

 the middle of the costal cell, and includes before its end a rather 

 large hyaline drop, close by the margin; a smaller hyaline drop 

 is placed upon the tip of the brownish-black stigma; immediately 

 beyond the stigma, on the anterior margin, there are two trian- 

 gular, hyaline spots, separated only by a brown stripe ; their end 

 crosses the second longitudinal vein ; the whole middle portion 

 of the wing is perforated by a few isolated, very small hyaline 

 drops ; upon the second half of the posterior margin there are 

 four large hyaline drops, two before and two after the end of the 

 fifth longitudinal vein; a fifth, much smaller drop, is placed 

 much nearer the tip of the fourth vein ; the last portion of the 

 sixth longitudinal vein is surrounded by a cluster of somewhat 

 larger spots, which, in consequence of the more faded brown, 



