291 



DESCRIPTION. 



Winged Male. — Body, 2.8 millimetrea loug; head to tip of folded wings, 5.5 milli- 

 metres; wing expanse, 10 millimetres ; antennae, 1.5 millimetres. 



Head and thorax blackish or bluish black, with a slight glaucous bloom ; dorsum 

 of abdomen yellowish brown, with large blackish quadrangular spots arranged in 

 two longitudinal rows, one on each side the median line ; ventral surface of abdo- 

 men yellowish brown. Legs piceous, except bases of femora, which are lighter. 

 Cornicles yellowish, rather long for this genus, vasiform. Antenn;e piceous, hairy, 

 much roughened ; joint iil long, but shorter than iv plus v; iv slightly longer rhan 

 V ; VI about one-half as long as v, with the thumbs like vii, very short. Wings sub- 

 hyaline, with the insertions, veins, and stigma dull yellowish-brown. Cauda and 

 anal plates blackish. 



Oviparous Female (Fig. 25, a, b). — Body, 4.5 millimetres long by 2.5 wide across 

 middle of abdomen ; antennu», 1.5 millimetres long. 



General color, yellowish brown, with the head tawny yellow, and middle of ab- 

 dominal dorsum almost olive green ; a longitudinal row of indented black dots on 

 each side near margins. Body, legs, and antenna} very hairy. Cornicles, yellowish- 

 brown, often slightly dusky at the tip, vasiform. Two front pairs of legs, yellowish- 

 brown, with tips of femora and tibiie, together with tarsi, blackish ; third pair, 

 yellowish-brown, with tips of femora and all of tibi;B, and tarsi blackish. Antennae, 

 yellowish-brown proximally, blackish apically ; joint iii, long; IV and v, subequal; 

 VI, slightly shorter than vii. Kostrum reaching middle coxae, dusky at tip. 



F. Detmers, del 



Fig. 25. Melanoxanthus bicolor : a, oviparous female, enlarged ; b, head and antennae of same, more 

 enlarged ; c, eggs on willow twig, slightly enlarged (original). 



The EGG (Fig. 25 c). — Length 1.2 millimetre; oblong oval; yellowish brown at 

 first, but becoming shining black on exposure to air ; deposited on the twigs, espe- 

 cially about the buds. 



The Flocculent Melanoxanthus. {Melanoxanthus floccidosua, n.sp.) 



Early ia October I saw colonies of a very llocculent plaat-louse on 

 Willow bushes in a ravine near Columbus. I recognized it as a Melan- 

 oxanthus, different from any of the described species, but at the time 

 was unable to make descriptive notes of the viviparous forms then pres- 

 ent. The place was not again visited until IS'ovember 19, when the only 



