NO. 2105. NEW 8PEC1ES OF HYMEXOPTERA—ROHWER. 213 



Genus CROESUS Leach. 



CROESUS CASTANEAE, new species. 



This species may be readily separated from that group of species 

 which has long gone under the name latiiarsus by having the apical 

 margin of the clypeus depressed in the interstitial second recurrent 

 nervure and the sliining mesepisternum. 



Female. — Length 8 mm. Apical margin of the clypeus narrowly, 

 subangulately emarginate, the apical margin broadly depressed, the 

 basal area gently convex, shining; labrum much longer than the 

 clypeus, truncate apically, sparsely clothed with long gray hair; 

 supraclypeal area convex, triangular in outline; supraclypeal foveae 

 deep, elongate, connected with the antennal foveae; middle fovea 

 sharply defined, subtriangular in outhne, not breaking through the 

 frontal crest; ocellar basin pentagonal, pointed on the postocellar 

 line, the greatest length but little greater than the greatest width; 

 the head not noticeably depressed latrad of the ocellar basin; posto- 

 cellar area defined laterally by short deep furrows ; postocellar furrow 

 nearly obsolete; postocellar line subequal with the ocellocular line; 

 front opaque with fine aciculations; third and fourth antennal joints 

 subequal; mesothorax shining; second recurrent vein interstitial with 

 the second transverse cubitus; third cubital cell much longer than its 

 apical width; sheath straight above, sharply tapering to the apex. 

 Black; apical margin of the clypeus, the basal half of the four anterior 

 tibiae, the basal part of the four anterior tarsi, the apices of the pos^ 

 terior coxae, their trochanters, and the basal third of the posterior 

 tibiae white; wings hyaHne; venation black. 



Male. — Length 6 mm. Agrees with the above description of the 

 female except that the apical margin of the clypeus is hardly depressed, 

 and the second recurrent vein is received slightly basad of the second 

 transverse cubitus; hypopygidium shining, narrowly rounded. 



Falls Church, Virginia. Described from three females and two 

 males recorded under Bureau of Entomology No. Hopk. U. S. 10154; 

 material collected August 7, 1912, by WiUiam Middleton, adults 

 emerging the following September. The larvae feed gregariously on 

 the leaves of Castanea dentata. They are bright yeUow with a black 

 head and transverse black bands. 



Type.— Csii. No. 18527, U.S.N.M. 



Genus EUURA Ne^;vnnan. 



EUURA COSENSn, new species. 



" Undescribed gall on Salix huiiiilis Marsh," Cosens, Trans. Oanad. Institute, 

 vol. 9, 1912, p. 335, 336, fig. 5 and 85. 



This species runs, in the pubUshed synopsis^ to salicis-nodus Walsh, 

 but is readily differentiated from that species by the shape of the 



' Journ. N. Y. Ent. .Soc, vol. 17, 1909, p. 9. 



