ALBERT F. SWAIX 9 



gi'een throughout. Legs dusky except coxae and bases of femora, which are 

 green. Cornicles dusky with the bases green. Cauda green, faintly dusky 

 toward apex. Wings normal, veins being dusky-amber in color. 



Head (fig. 4) almost rectangular in shape, the front being flat. Antennae 

 are set on prominent tubercles, and are about twice as long as the body. Seg- 

 ment VI spur is the longest segment, followed by III, V, IV, VI base, I, and II. 

 Ill is about four-fifths the length of VI spur, IV slightly shorter than V, which 

 in turn is about five-sixths as long as III. VI base is about one-fifth as long 

 as VI spur. In but one antenna of ten examined was V as long as III, and 

 in but one was IV as long as V. The usual primary sensoria are present on V 

 and VI, and the usual accessory sensoria on VI. IV is without sensoria. On 

 III (fig. 4) there are from nine to eleven circular, equal-sized, secondary sen- 

 soria arranged in a more or less even line along the basal three-fourths of the 

 segment. The beak is fairly long, reaching to the base of the abdomen. The 

 prothorax and abdomen are without lateral tubercles. The cornicles (fig. 31) 

 are large, vasiform, with the tip reticulated and the rest imbricated. They 

 are about one-third the length of the body, usually being slightly longer than 

 segment III of the antennae. The cauda (fig. 28) is about one-half the length 

 of the cornicles, ensiform, and with upturned tip. 



Measurements: Body length, exclusive of cauda, 1.34-1.72 mm.: width of 

 thorax, .62-.70 mm.: antennae total, 2.69-2.91 mm. (ave. 2.807mm.); Ill, .55- 

 .62 mm. (ave. .594 mm.); IV, .31-58 mm. (ave. .474 mm.); V, .31-. 62 mm. (ave. 

 .517 mm.); VI base, .16-.22 mm. (ave. .19mm.); VI spur, .67-795 mm. (ave. 

 .745 mm.): cornicles, .61-.67mm.: cauda, .23-. 31 mm.: wing length, 3.48-3.74 

 mm. 



Apterotis viviparotis female. — These are a light yellowish to a deep rich green 

 color, with antennae, cornicles, and legs faintly dusky. The bases of the legs 

 are light yellow to green; the cauda is light yellow, green, or faintly dusky. 

 Segment III (fig. 40) of the antennae sometimes has one or two small sensoria 

 near the base. Of eighteen segments examined, ten had no sensoria, seven 

 had one, and one had two. The antennal tubercles, cauda, and cornicles are 

 similar to those of the alates. 



Mcasui-emcnts: Body length, exclusive of cauda, 1.61 mm.: width at base of 

 cornicles, .75 mm.: antennae total, 2.65 mm.; Ill, .61 mm.; IV, .48 mm.; V, .45 

 mm.; VI, base .16 mm.; VI spur, .75 mm.: cornicles, .67 mm.: cauda, .22 mm. 



Lachnus ferrisi new species (Figs. 3, 18, 19, 25.) 



In 1909, and 1910 Davidson^ reported having found Lachnus 

 abietis Fitch on Abies concolor (lowland fir) at Stanford Univer- 

 sit5^ In September 1915, G. F. Ferris found a large-sized species 

 of Lachnus infesting the trunks of some young pine trees {Pinus 

 sp.) at Stanford University. To the writer this species was 



* Davidson, W. M., Notes on the Aphididae collected in the vicinity of Stan- 

 ford University, Jour. Econ. Ent., 2: 299, 1909; and Further notes on the 

 Aphididae collected in the vicinity of Stanford University, Jour. Econ. Ent., 

 S: 374, 1910. 



TRANS. AM. ENT. SOC, XLIV. 



