158 Annals Entomological Society of America [Vol. X, 



thorax together longer than abdomen; wing pads broad, reaching beyond 

 hind coxse. Antenna long, nine-jointed; formula 1, 3, (4, 5), 9, 6, 2, 7, 

 8; all joints sub-equal in diameter and distally annulated with white; 

 without hairs (occasionally a few short ones on joint one) (PI. XV, fig. 9). 

 Legs long and stout, tarsus little more than one-third length of tibia with . 

 vestigial claw; short hairs present on all joints except tarsus; trochanter 

 bearing a group of pores varying in number (PI. XV, fig. 10). Integu- 

 ment with hairs scattered over cephalic and thoracic areas ; on abdomen 

 arranged segmentally in transverse rows; a few pores of same type as in 

 stage four (PL XV, fig. 8) interspersed among abdominal hairs; a poly- 

 gonal protuberance at end of body. 



Male, sixth stage, adult. — "About 3 mm. long and 1..3 mm. broad, 

 slightly pubescent. Color of abdomen reddish brown. Mcsothorax 

 black, with four raised knobs. Front part of head black, eyes very 

 prominent, strongly facetted, black. Legs and antennse black and 

 very hairy. Ventral surface of abdomen dark brown, segmentation 

 distinct. Mesosternum black, a small black line on prosternum, and an 

 irregular black i^atch on metasternum. Abdominal brushes with long 

 stout glassy bristles about 6 mm. long. Style short, stout and conical. 

 Antenna) ten-jointed, very hairy, reaching beyond end of abdomen. 

 Joint two shortest, joints three and ten a little longer, and the other 

 joints sub-equal. Each joint with numerous hairs. Wings large, about 

 S mm. long and 1 mm. broad, expanse about 7 mm., smoky, slighth' 

 pubescent, with the costal space blackish -brown. Halteres resembling 

 small wings with several hooks. Legs long and very hairy. Femur 

 much shorter than tibia. Tibia about four times as long as tarsus. 

 Digitules fine hairs. Claw long and slender and well curved. Digitules 

 short club-shaped hairs." (Ehrhorn). 



Xylococcus alni n. sp. 



No measurements of this insect were taken, because only dried 

 specimens were at hand. 



Eggs. — Color deep lemon yellow. 



Larva, first stage. — Color orange red. Shape broadly oval, segments 

 all well defined. Eyes black; situated on prominences lateral and 

 posterior to antennee (PI. XV, fig. lie). Antennse short, stout, six- 

 jointed; formula G, 2, 1, (4, 5), 3; joints one and two stoutest; remaining 

 joints approximately equal in diameter; joints three and four without 

 hairs; hairs on joints one, two, five, and six increasing in length towards 

 apex of antenna; on joint five at base of exterior lateral edge a stout 

 spine; on joint six a ring of four stout spines near the base and a single 

 spine on apex; a very long bristle at apex; a single pore on joint two 

 (PI. XV, fig. 11). Legs long and stout; tarsus longer than' tibia; a ring 

 of pores and one long hair on trochanter ; a few hairs on tibia and tarsus ; 

 digitules on tarsus fine unknol)bcd hairs, on claw knobbed hairs (PI. XV, 

 fig. 12). Rostrum large; situated about middle of body; sucking 

 bristles very long. Anal tube large; formed by an extension of the 

 outer walls of a circle of chitinous spinnerets which surround and open 



