164 MAINE ACRICULTUIL'M, EXPERIMENT STATION. I912. 



Fig. ^^d. Antennal joint VI of fore 

 going figure. 



Lachnus laricifex Fitch. 

 What is apparently this spe- 

 cies of Fitch's is not uncom- 

 mon on the larch (7^. laricina 

 Koch) in Maine. Packard 

 (1890) quotes the original 

 description and records scat- 

 tered individuals from Augusta, Maine. No figures have been 

 published for this larch aphid in America. Cholodkovsky 

 (1899), however, figures a larch species, maculosus Cholodkovs- 

 ky which is certainly closely allied to the Maine material and 

 may perhaps be the same. 



Apterous viviparous female. Head dark brown. Beak ex- 

 tends to about the middle of abdomen. Antennal total length 

 about 1.3 mm. Ill 0.46 mm; IV 0.2 mm; V 0.26 mm; VI 0.17 

 mm ; IV with one large circular sensorium at distal end ; V with 

 usual terminal sensorium and one other large circular sen- 

 sorium near it; VI with group of sensoria. Prothorax and 

 thorax dark brown with black markings. Head and thorax with 

 white pulverulency both dorsally and ventrally. Femora dark, 

 tibiae pale proximal end, distal dark; hind tibia slightly bowed; 

 tarsi black. Tarsus with first joint elongate and subequal (at 

 longest dimension) to half the second joint; hind tarsus includ- 

 ing claw about 0.5 mm; first joint 0.15 mm; second exclusive of 

 claw 0.32 mm. Abdomen sparsely hirsute, dark brown and 

 slightly pulverulent ; there is a pale mid dorsal line, and the dor- 

 sum is decorated with black spots and dots, and dark transverse 

 markings, cornicles dark. This form and nymphs common 

 along: small twigs and on leaf tufts of larch. 



Fig. 277. L. laricifex. Antenna of apterous viviparous female. 



Alate viviparous female. I have no color description of the 

 winged form but the bodies in balsam accord with those of the 

 apterous female. The wing is better characterized by the pho- 

 tograph, (Figs. 306 and 307), than by a description. The an- 

 tennal measurements are, — I, o.i mm; II, 0.125 mm; III, 0.5 

 mm; IV, 0.225 mm ; V, 0.29 mm; VI, 1.5 mm. Ill has a row of 

 about 9 sensoria, IV has one near distal end, V has one besides 



