Kinsey: Studies of Cynipidx 



59 



sidal grooves rather fine and shallow, continuous to the pronotum, 

 slightly obscured in a more rugose area anteriorly; median groove indi- 

 cated for a quarter the length of the mesonotum; anterior parallel lines 

 barely indicated; lateral lines more or less distinct; scutellum elongate, 

 well rounded posteriorly, rugose, depressed anteriorly, most so laterally, 

 not forming distinct fovese; pronotum laterally rugose; mesopleurae 

 smooth, only obscurely coriaceous, shining, naked, edges rugose, trans- 

 versely crossed below the middle with a rugose band which is very 

 rugose posteriorly. ABDOMEN: Brighter basally, darker posteriorly 

 and ventrally; entirely smooth, naked except for a very few hairs 

 basally; of moderate length, somewhat produced dorsally, the second seg- 

 ment covering a half to two-thirds or more of the area; edges of seg- 

 ments somewhat oblique; hypopygiumi broad, pointed, the spine short, 

 fine. LEGS: In part rufous, in part brown; tarsal claws fine, simple. 

 WINGS: Narrow; only finely ciliate on the margins; tinged yellowish 

 especially on the radial cell; veins not heavy, of a medium brown; 

 areolet small to closed; cubitus hardly continuous, faint at the basalis; 

 radial cell closed but the marginal vein rather faint, of moderate length, 

 the second abscissa of the radius only slightly curved; first abscissa well 

 curved, arcuate with only a slight suggestion of an angle. LENGTH: 

 1.5-2.2 mm. 



MALE. — Differs from the female as follows: First two segments 

 of the antennse darker, third segment relatively longer; abdomen piceous 

 black, very small, somewhat pedicellate, sometimes elongate triangulate; 

 legs darker; wings almost clear, the radial cell more distinctly closed; 

 length 1.2-2.0 mm. 



GALL. — Small, elongate stem swelling. Polythalamous, with rather 

 few cells. Irregular, usually longer than wide, sometimes rather globose, 

 more or less abrupt, usually but not always symmetrical about the stem, 

 covered w^ith brown bark somewhat different from the normal bark; up 

 to 30. mm. long by 8. mm. in diameter, usually smaller, sometimes sev- 

 eral more or less fused. Internally woody, rather solid, the normal stem 

 tissue more evident centrally; the larval cells more or less elongate 

 oval, the lining rather distinct but inseparable. On stems of Rosa 

 species. 



RANGE.— Canada: Toronto (Cosens). Illinois (Weld). Colorado. 

 California. Probably occurs thruout North America, wherever roses 

 occur. 



This is one of the primitive species of the genus, as indi- 

 cated by the closed radial cell, the small second abdominal 

 segiiient, the equal numbers of the two sexes, and the slight 

 development of the gall. It is not the same species as Diplo- 

 lepis verna (Osten Sacken), altho both species are prim- 

 itive. This species should be discovered wherever roses occur 

 in North America, and many other varieties will need to be 

 described. 



Of 236 insects I have bred, only 89, or 38 per cent, are 



