o 



■44 THE CANADIAN ENTOMOLOGIST. 



greenish-white ; length, 5 mm. The larva is not transparent, rather 

 grayish. The cast skins are light cinereous and may all be found in the 

 mine intact, thick and opaque. 



Sixth stage. — On assuming this stage, the larvae burst through the 

 upper skin of the mine and fall to the ground, where they enter the earth. 



Head more rounded than before, the mouth scarcely projecting. 

 Pale watery-yellowish, the eye concolorous ; width, i mm. Subventral 

 ridge prominent, undulate. Thoracic feet concolorous, scarcely dis- 

 tinguishable. Body translucent-white with a yellow tint, becoming darker 

 or ochreous on the thoracic segments. 



Larvae from Plattsburg, N. Y. 



Hylotoma virescens, Klug. 



I have recently described this larva under the name Hylotoma 

 McLeayi (2L). The male flies sent to Mr. Marlatt were positively deter- 

 mined as McLeayi, confirming my own determination. However, some 

 female flies, subsequently emerged, seem not to differ from my specimens 

 named clavicortiis, in which the posterior half of the abdomen is black. 

 But, as the larvae are quite different, I would suggest to revive the 

 name virescens, Klug., from the synonymy for them. Food plants : 

 Betula, Salix, Amelanchier, Pyrus (choke-berry and mountain ash) 

 and Fragaria (strawberry). 



Hylotoma, sp. 



The larvae marked 2B have been bred, but only males so far. Con- 

 sequently I hesitate to apply a name to them. 

 Hylotoma clavicornis, Fabr. 



Eggs (deposited by a fly with abdomen all reddish). — Laid in the 

 edge of a leaf of Salix in the usual manner. The young larvae are paler 

 than the mature ones and very faintly marked. Gradually they assume 

 the mature characters. 



Mature larva. — Head rounded, full at the vertex, the sutures 

 obscured, shining black or light red or intermediate, a little paler around 

 the mouth; width, 1.8 mm. Thoracic feet very large, spreading; 

 abdominal small, on joints 6-1 1 and 13, a spot on joint 13 representing 

 the foot there, the posterior feet the smaller. On the body are nine 

 black tubercles in a square, the middle anterior one a little out of line, 

 the anterior row smaller, confused on the thoracic segments. Some small 

 spots in a row ventrally and one behind the spiracle. Subventral ridge 

 with a large black spot and on some segments with two or more small 

 ones. Setae minute, black. Body greenish-yellow, with a whitish tint, 

 more green dorsally ; a whitish subdorsal line between tubercles i and 2. 

 Thoracic feet except at joints and abdominal ones outwardly black ; anal 

 feet yellow. 



Larvae from Plattsburg, N. Y., and Jefferson, N. H. 



The larvae of claviconiis are frequently gregarious, whereas those of 

 virescens are almost always found singly. 



