APHID PESTS 0^ MAINE. ' 1 67 



side of dorso-niesal area, and two extra median ones on ist 

 abdominal segment. These are the wax-pore plates, See Fig. 

 282, b being an enlargement of area a. Cornicles dark brown. 

 These are found thickly packed in new growth with beaks in 

 twig of Picea abies. Collection Nos. — 71-06; 36-09; 33-10. A 

 small collection (33-11) of the same species was taken from 

 Picea canadensis July 22, 191 1. 



Lachnus strobi Fitch. Since 1904 numerous collections of 

 this species have been made in the vicinity of Orono where it is 

 very common on the white pine. Weed' (1890) describes and 

 figures the true sedges of strobi. The following account will 

 give the substance of the Maine records. 



Apterotis viviparous female. Entire body greenish black. 

 Antennal measurements as follows : I, 0.08 mm ; II, 0.06 mm ; 

 III, 0.32 mm; IV, 0.13 mm; V, 0.175 mm; VI, 0.16 mm. Ex- 

 cept for a sensorium on V there are no sensoria on antenna 

 other than the usual distal ones of V and VII. (Fig 283). 

 Eyes prominent. Beak extends nearly to middle of the abdo- 

 men. Abdomen hirsute (hairs stiff), pulverulent on ventral 

 surface. Cornicles black. The abdomen globular and glistening 

 and bronzy. 



Fig. 283. Lachnus strobi. Antenna of apterous viviparous female. 



Alate viviparous female. A dark brown nearly black 

 Lachnus with a whitish pulverulency on ventral surface arid a 

 median whitish line, extending from front of head to cauda, 

 which is interrupted in region of cornicles. The cornicles are 

 black and situated in a black patch with a cephalad and caudad 

 margin of white spots which are conspicuous. The white 

 median line is sometimes broken into spots on the abdomen and 

 sometimes rubbed off. The antennal measurements are I, 0.08 

 mm; II, 0.06 mm; III, 0.46 mm; IV, 0.17 mm; V, 0.2 mm; 

 VI, 0.17 mm. Ill with about 10 sensoria in a row; IV with 2 

 sensoria ; V with i besides the usual distal one. Fig. 284. The 

 thoracic lobes are black. The wings with Mi very delicate and 



