Kinsey, Ay res: Varieties of a Gall Wasp 145 



front, more rugose and punctate on the face; covered with fine hairs. 

 Antennse with 14 (or 15) segments; second segment globose, the third 

 distinctly longer than the fourth, the last almost twice the length of 

 the preceding, or incompletely divided. THORAX: Finely, irregularly 

 roughened, finely punctate and covered with fine hairs; parapsidal 

 grooves distinct but not deep, rather widely separated at the scutellum, 

 continuous to the pronotum; median groove of variable length; anterior 

 parallel lines smooth, not at all prominent, extending less than one- 

 half the distance from the pronotum to the scutellum; lateral lines 

 fine, smooth; mesopleurae smooth, with an irregularly rugose area 

 dorsally, and a rugose, transverse band two-thirds toward the ventral 

 edge; scutellum irregularly, finely rugose, covered with fine hairs, a 

 transverse, rugose groove at base not forming foveas. ABDOMEN: 

 Shining, naked, completely, finely reticulate; distinctly elongate; second 

 segment covering less than one-third the whole abdominal area, the 

 edge somewhat oblique, only moderately rounded ventrally; segments 

 behind the second sparsely fringed with fine hairs; ventral sheath plow- 

 shaped, spine short, blunt. LEGS: Punctate and covered with fine 

 hairs; claws simple. WINGS: Set with fine hairs; very short ciliate; 

 veins dark brown, rather heavy; areolet of variable size; cubitus con- 

 tinuous but fine at the basalis, or discontinuous; radial cell short, open 

 in most varieties, but often with a more or less heavy brown shading 

 along the margin; a slight shading of brown covering the whole radial 

 area and parts bordering it; first abscissa of the radius arcuate to 

 angulate with occasionally a prolonged but more or less detached pro- 

 jection into the radial cell. LENGTH: 2.5 to 4.3 mm. 



MALE. — Differs from the female as follows: Head black except 

 the dark rufous mouthparts ; antennse wholly black or with the first three 

 segments ruf o-piceous ; with 14 or 15 segments, the third twice the 

 length of the fourth, slightly curved, the last longer than the preceding 

 or incompletely divided; thorax black or tinged with rufous in places; 

 abdomen black, very small; legs rufous, the hind coxae more or less 

 piceous; wings shaded not so heavily as in the female, the radial area 

 open or often closed; length 1.5-3.0 mm, 



GALL. — Good-sized, irregularly rounded, more or less spiny twig 

 gall. Polythalamous, with many larval cells. Of variable size, up to 

 50. mm. in diameter, or of greater length, usually smaller. Very irregu- 

 lar in shape, most often globose or elongate, arising more or less abruptly 

 from the stem; covered with a thin and partly deciduous bark; green, 

 tinged with pink when young, reddish or dull purplish brown when ma- 

 ture, light brown in some varieties, darkening with age; entirely smooth, 

 or covered with a few, stout spines, or with slender, even moss-like, close- 

 , set spines. Internally solid, more or less compact with soft, whitish 

 tissue, the larval cells elongate, lying irregularly, more toward the 

 center of the gall. Terminally, laterally (on a lateral twig), or along 

 a continuous stem; on Rosa spp. 



RANGE. — Illinois and Wisconsin to New Mexico, southern Cali- 

 fornia, and Washington, 



10—21784 



