138 Annals Entomological Society of America [Vol. X, 



Lachnus braggii, n. sp. 



Taken feeding upon the bark of the twigs of Colorado blue spruce, 

 Picea parryana, only. 



Stem Mother. — Almost completely covered with a white pulverluence, 

 but over the dorsum there are many spots and transverse broken bands 

 where the white powder is not present and where the dusky brown to 

 black color of the body can be seen. The cornicles are dark brown or 

 blackish in color, quite small, and not very much elevated above the 

 surface. The legs except the tips of the tibiae and the tarsi; and the 

 antennas, except the extreme tips, are light amber in color. The eyes and 

 genital plates are black, and the ventral surface of the body is covered 

 with a light gray pulverulence. Joint G and distal end of 5 of the 

 antenna, black or blackish; length of body from 3.20 to 3.70; width 

 2.40 to 2.50; length of antenna] joints: III, .40; IV, .17; V, .21; VI, .17; 

 whole length, 1.10; joints 4, 5 and 6 usually with one sensorium each 

 besides the permanent ones on 5 and 6. When placed in balsam, there 

 is a broken line of black extending from the prothorax to the first seg- 

 ment of the abdomen on either side of the median line. The two lines 

 are made by a pair of black blotches upon the dorsum of each thoracic 

 segment; a row of small black dots lies outside of these near each margin. 

 The body is covered with a very fine, but rather long, pubescence which 

 occurs also upon the joints of the antennas and upon the legs. The 

 length of the hind tibias is l.GO to 1.70; beak short, but little surpassing 

 the hind coxas. See Plate XI, figures 1 to 4. 



Apterous Viviparous Female, Second Generation. — Body covered with 

 white pulverulence as in case of the stem mother; color also the same 

 throughout. Length of body 3.75; width 2.40; antennal joints: III, .46; 

 IV, .18; V, .23; VI, .17; length of antenna, 1.17; cauda appearing as 

 a short broad lobe, convex on the posterior margin, and slightly up- 

 turned; beak just surpassing the 2d coxae; head very small, quite convex 

 on the frontal margin, not bi-lobed; sensoria of antenna rather indistinct 

 and about as follows: III, 0; IV, .1 or .2; V, .2; VI, with terminal cluster. 

 See figure 5. 



Young of Third Generation, before first moult, pale amber in color, 

 with a light covering of white pulverulence, and the head rather con- 

 spicuously dark dusky brown. Down the dorsum is a double row of 

 small naked spots that appear a little darker than the general surface. 

 The cornicles appear as little black dots ^nd the genital plates and tarsi 

 are dusky brown. See figure 6. 



Winged Female, Third Generation. — Reared in the laboratory from 

 the same colony froni which the stem mother was described. 



The ground color is pale to dark yellowish brown, or, in light 

 examples, a sordid white. Head and thorax above, blackish or dark 

 chocolate brown, rather heavily powdered with white; eyes and cornicles 

 black, as are also the tarsi, and distal ends of all the tibiae, the genital 

 plates, the stigma of the wings, the last joint of the antennae and very 

 short distal rings upon joints 3, 4 and 5. The abdomen may be almost 

 entirely white, due to the white powder which covers the body, or there 

 may be very distinct white transverse bands separated by a somewhat 



