LARCH INSECTS. 903 



29. The larch chermes. 



Chermes laricifolice Fitch. 



Order Hemiptera ; family Aphid^. 



Solitary and stationary upon the leaves, extracting their juices, small black shin- 

 ing flies 0.10 long, having the abdomen dark green, the legs obscure whitish, the 

 •wings nearly hyaline with pale brown veins, and the large stigma-spot upon their 

 outer margin beyond the middle more opaque and pale green. 



This is closely like the pine Chermes, but has the wings more clear, 

 and differs also in some of the details of its colors. (Fitch.) 



Dr. Hageu notes its occurrence in the Arnold arboretum. (Can. Ent., 

 1889, p. 126.) 



30. The red mite. 



Tetranychus telarius liinn. 



In June, the foliage of the larches in the grounds of the University 

 at Normal were seriously affected by the red mite ( Tetranychus telarius 

 L.), some of the trees seeming likely to die. On one of those worst in- 

 fested we tried the effect of spraying with a kerosene emulsion made 

 with soap, and diluted to contain 2^ per cent, of kerosene. The insects 

 were greatly reduced in number by a single application, but not all 

 killed. The tree soon revived appreciably as compared with those not 

 treated. (Forbes's Third Kep. Ins. 111.) 



The following insects also occur on the larch : 



Order Lepidoptera. 



31. In July and August troops of white caterpillars with black dots 



and along their backs eight black tufts of hairs. The larvae of the 

 hickory tussock moth {Lophocampa caryce), are sometimes found 

 on this tree, nearly stripping the leaves from the limbs which 

 they occupy. (Fitch.) 



32. In Labrador I have found the larva of what I suppose to be Arctia 



quenselii feeding upon the larch in July. As this insect also in- 

 habits the summit of Mt. Washington, N. H., it should be looked 

 for there on larches. 



33. Pieris menapia. Injures the tamarack on the Pacific coast. (Amer. 



Nat., Oct., 1882.) 



Order Coleoptera. 



34. Dendroctonus sp. In immense numbers under the bark of sickly 



and dying trees. Harrington, Can. Ent., xvi, p. 218. See also 

 Proc. Ent. Soc, Wash., i, p. ]75. 



35. Hylesinus opaculus. Associated with the preceding beetle. Har- 



rington, Can. Ent., xvi, p. 218. 



36. ^omicus pini. Barris's Treatise, etc., 88. 



