ALBERT F. SWAIN 13 



Anal plate with distal margin black. The body is practically bare except for 

 bristle-like hairs on the antennae, legs, cauda, and anal plate. The coxae 

 are black, the femora yellowish with tips dark, tibiae the same, tarsi dark. 

 The first joint of the hind tarsus is about one-third the length of the second 

 joint. The middle tibiae are about two-thirds as long as the hind tibiae. 

 Wings (fig. 10) are hyaline with the costal, subcostal, and stigmal veins and 

 the stigma grayish, and the fii-st and second discoidal veins yellowish gi'ay. 

 The third discoidal is very indistinct and obsolete at the base. It is twice- 

 branched, except in a few cases where it is but once-branched (in five out of 

 thirty-one wings examined, it was once-branched). The first branch arises 

 about halfway from the base to the wing margin, and the second from very 

 near the margin to two-thirds the distance from the margin to the first branch, 

 usually about one-half the distance. The angles of the branches are not par- 

 ticularly acute. Hind wings normal with yellowish gray veins. 



Measurements: Bodj^ length, 2.08 mm.; width, 1.4 mm.: antennae, total, 

 .634-.795 mm. (ave. .7672 mm.); Ill, .230-.305 mm. (ave. .2985 mm.); IV, 

 .101-137 mm. (ave. .118 mm.); V, .110-.146 mm. (ave. .1329mm.); YI, .092- 

 .126 mm. (ave. .1080 mm.): cornicles, diameter of opening, .037 mm.; first 

 joint, hind tarsus, .073 mm.; second joint, .210mm.: middle tibia, .99 mm.: hind 

 tibia, 1.5 mm.: wing length, 5.3 mm.: width, 1.6 mm. 



Apterous viviparous female. — The body coloring is about the same as that 

 o&the alate females. In some specimens the pulverulence is lacking, the indi- 

 viduals being a shiny-amber color. The antennae arc colored as follows, I 

 dark, II dusky yellow. III dusky yellow with tip dark, IV dusky yellow with 

 apical one-half dark, V dark with base dusky yellow, VI dark. The usual 

 primary and accessory sensoria are present, but there arc no secondary sen- 

 soria. The beak is amber with base and tip dark, and reaches almost to the 

 tip of the abdomen. The thorax is brown with black lateral longitudinal 

 stripes. The abdomen is amber with black spots on the dorsum as in the 

 alates, and with four black spots near the base of the cauda. The cornicles 

 (fig. 27) are short and black, being .slightly more distinct than in the alates. 

 The coxae are black, femora amber with basal one-half dark, or amber thi'ough- 

 out, tibiae amber with base and tip dark, tarsi dark. 



Measurements: Body length, 2.00 mm.: antennae total, .715 mm.; Ill, .257 

 mm.; IV, .110 mm.; V, .119 mm.; VI, .110 mm. : cornicles, diameter of opening, 

 .037 mm.; height, .010 mm.: first joint of hind tarsus, .073 mm.; second 

 joint, .211 mm. 



The.se specimens were carefully compared with cotyix- speci- 

 mens of Lachnus pseudotsugae Wilson, in Essig's collection, and 

 the following points of difference noted: 



L. pseudotsugae Wilson L. taxifolia new species 



III with 3 to 4 secondary sensoria III with 3 to 7 sensoria (modal num- 



ber being 5) 

 III almost as long as IV, V, and VI III scarcely as long as IV and Y 



together 



TRANS. AM. ENT. SOC, XLIV. 



