no. 2181. SAWFLIES OF GENUS DIMORPHOPTERYX— ROHWER. 447 



long as the basal width, their apices, obtusely triangular; four anterior 

 femora yellowish or reddish; transverse radius received basad of the 

 middle of the cell. 



DIMORPHOPTERYX PINGUIS (Norton). 



Allantus pinguis Norton, Boston Journ. Nat. Hist., vol. 7, pt. 2, 1860, p. 244. 

 Strongylogaster pinguis Norton, Catalogue, p. 150. 



Dimorphopteryx pinguis Ashmead, Can. Ent., vol. 30, 1898, p. 308. — Rohwer, Proc. 

 U. S. Nat. Mus., vol. 41, 1911, p. 405. 



The type-specimen of this species is lost, but a neotype is in the 

 United States National Museum. 



MacGillivray * says that Provancher's Sciapteryx punctum is the 

 female of this species. I have not examined the Provancher type, 

 but accept the synonymy. Some of Doctor Dyar's rearings may 

 refer to this species, but some of them refer to errans. If all other 

 of Doctor Dyar's rearings refer to errans, the host plants of pinguis 

 are Amelanchier canadensis and Maple. 



DIMORPHOPTERYX AUTUMNALIS, new species. 



Female. — Length, 8 mm. Labrum broadly rounded apically ; clypeus 

 gently convex, sparsely punctured, the apical margin subsquarely emar- 

 ginate, the lobes rectangular, about one-third as wide as the width 

 of the emargination; supraclypeal area flat; area latrad of the ocelli, 

 postocellar area and posterior orbits, shining, practically impunc- 

 tate; ocellar basin with broad sloping walls, distinct furrow from the 

 anterior ocellus to the ventral margin of the basin; postocellar furrow 

 straight; third antennal joint one-third longer than the fourth; scu- 

 tum and prescutum sculptured similarly; punctures of the scutellum 

 large; sheath with dorsal margin straight, apical margin sub truncate, 

 lower angle broadly rounded. Black; labrum, apex of the clypeus, 

 posterior lateral margin of the pronotum, tegulae, scutellum, four 

 anterior legs below the middle, the coxae, most of the posterior 

 coxae, posterior trochanters and posterior tarsi, white; (the four 

 anterior femora are slightly reddish); abdomen beyond the basal 

 plates, posterior femora and tibiae and the antennae, castaneus; 

 wings hyaline, iridescent, venation dark brown except the costa, 

 which is reddish. 



Falls Church, Virginia. Described from two females recorded 

 under Bureau of Entomology Number Hopk. U. S. 10168, material 

 collected by C. T. Greene and reared by William Middle ton. 



Type-specimen.— Cut. No. 18189, U.S.N.M. 



DIMORPHOPTERYX CASTANEAE, new species. 



Female. — Length, 8 mm. Labrum long, broadly rounded apically; 

 clypeus evenly convex, shining, with scattered, large, well-defined 

 punctures, the apical margin subsquarely omarginato, the lobes rec- 



» Can. Ent., vol. 40, 1908, p. 368, 



