PROCEEDINGS OF THE NATIONAL MUSEUM, 133 



two short median grooves anteriorly and tlie usual groove on the 

 shoulders. 



Scutellnni rounded, i>unctate, subpubescent, the fovea' small, ob- 

 lique. Mesopleura closely punctate; metapleuraandmetanotum densely 

 pubescent. Claws unidentate. 



Wings long, hyaline, the veins pale brown, the areolet distinct, the 

 cubital cell open, the vein at base of marginal cell almost straight or 

 but slightly bent, 



Tijpe.—iso. 3091, U.S.X.M. 



iS^umerous specimens; reared by Mr. Albert Koebele, at Placer 

 County, California, December 19, 1885, from galls on Qiiercxs ehry- 

 solepiH ; others reared January _!, 1882, and December, 1885. 



Genus AULAX, Hartig. 



In this genus I place several gall makers that agree quite closely with 

 the representatives of the European species of the genus, except that 

 the marginaJ cell is distinetly closed. 



37. AULAX MULGEDIICOLA, new species. 



Gall. — The gall of this species consists simply of a thin-shelled lar- 

 val cell, embedded in the pith of a common plant, Mnlgidium acumi- 

 natinii; usually there are uumerous cells crowded together side by side 

 in the pith, and externally the stem or stalk shows no apparent gall, 

 swelling, or deformation, although occasionally a slight swelling of the 

 stalk occurs. 



Galljiy. — Male and female. Length, from 1.4 to 2.6 mm. Head and 

 thorax black, anteume dark red, the legs, including coxa^, vary from a 

 red to reddish yellow, the abdomen red or sanguineous. 



Head and thorax opaque, closely, confluently punctate, Antenute 

 long, lo-Jointed in female (11 in nmle), the third joint not longer than 

 the fourth, the following joints gradually subequal, the terminal one 

 usually long, sometimes indistinctly divided into two joints; in the 

 male the third joint is slightly excised and shorter than the fourth, 



Parapsidal grooves distinct, and between them posteriorly at the 

 base is a very short groove. Mesopleura delicately, longitudinally 

 aciculated. Scutellum rounded, minutely rugose, with two, rather 

 shallow, oblique fovete at base. Abdomen ovate, polished, the ventral 

 valve and sheaths of ovipositor not projecting, the second segment 

 occupies half its whole surface; the third segment is about half as long 

 as the second, the following segments being very short. 



AVings hyaline, jiubescent, veins brown, the areolet very small, often 

 entirely wanting, marginal and cubital cells closed) 



Type.—^o. 3092, U.S.N.M, 



Xumerous specimens, most of them reared during January and Feb- 

 ruary, 1886, from galls collected in the District of Columbia, labeled 

 No, 3640. 



