22 Thomas Albert Williams 



Winged male: Body black, with a grayish pile which on the abdomen 

 gives it a distinct gray color ; abdomen with transverse rows of black dots ; 

 honey tubes black as is also the prominent conical tooth on the middle of 

 the abdomen ; antennae piceous throughout, except in some cases in which 

 the third joint is brown; legs piceous, except proximal half of femora 

 and in some cases more or less of the proximal portion of the tibiae, 

 which are reddish brown; beak black, except at base where it is brownish; 

 wing insertions and sides of mesothorax yellowish or reddish brown; wings 

 subhyaline, costal vein and stigma piceous, remaining veins brown. An- 

 tennae short, stout, provided with numerous spinose hairs and ventral sur- 

 face of III to VI tuberculate, III long, equal to IV plus V; IV short, one 

 third shorter than V, which is slightly longer than VI, the latter being dis- 

 tinctly swollen in the middle. Length of body 5 mm., to tip of wings 

 9 mm." (Weed). 



On bark of young shoots and branches of willows {Salix sp.). 

 Lincoln, November 1, 1888; Ashland, October 10, 1890. 



Specimens in collection of the University of Nebraska (nos. 

 21, 22, 23) and of the U. S. National Museum (no. 76). 



20. Lachnus flocculosa n. sp. 



Apterous viviparous female: Head brown. Antennae pale brown or in 

 young specimens more or less yellowish ; almost or quite half as long as 

 the body; I and II subequal, III longer than IV plus V, these latter sub- 

 equal ; VI with its short pointed spur only about three fourths V ; III 

 and IV cylindrical, V and VI somewhat club-shaped ; whole of antennae 

 covered with long, spreading, bristle-like hairs. Eyes dark red. Beak 

 reaching behind the hind coxae, black tipped. Legs pilose with dorsal 

 ends of femora and tibiae and tarsi brown to black; hind pair of legs gen- 

 erally darker and equaling the body in length. The second joint of the 

 tarsi very long. Abdomen greenish or reddish brown, oval, with a margi- 

 nal row of impressed blackish dots. Honey tubes with a broad conical 

 base and flaring mouth; concolorous with the abdomen and with only rim 

 dusky or becoming dusky towards the apex. Anal plates brown. Whole 

 insect hairy and very thickly covered with flocculent matter. Length of 

 body 1.90 to 2 mm. ; antennae 0.95 mm. 



Pupa: Very similar to the preceding but with the body generally more 

 green colored and paler. Wing-pads dusky to almost black. 



Winged female: Not found. 



No .specimens in either collection. 



21. Lachnus ponderosa n. sp. 



Apterous viviparous female: Large, brownish, pulverulent. The thoracic 

 segments and the first abdominal s.egment marked with large dark brown 



106 



