32 PROCEEDINGS OF THE NATIONAL MUSEUM vol.74 



one male, Washington, D. C, 1917, parasite of Laspeyresia molesta, 

 Quaintance No. 1345^ E. R. Selkregg; one female, Chain Bridge, 

 Va., June 14, S. A. Eohwer ; one female, Dead Run, Va., September 

 29, 1912, H. L. Viereck; one male, Virginia, July 16, 1880, T. Per- 

 gande; one female, Pyziton, Ala., H, H. Smith; one female, St. 

 Catherine's Island, Ga. ; one male, Forbing, La., March 24, 1908, 

 R. A. Cushman; one female, Dallas, Tex., April 17, 1906, W. W. 

 Yothers; one female, Victoria, Tex., April 22, 1907, R. A. Cushman; 

 one male, St. Louis, Mo., ex-case-bearer on smartweed, June 23, 1876 

 (Riley collection) ; and one female without data. 



DIAPETIMORPHA CINCTIVENTRIS, new name 



Mesostenus latidnotus Cresson, Can. Ent., vol. 10, 1878, p. 208, female (not 



Walker). Type.— No. 1181, Acad. Nat. Sci. Phila. 

 Mesostenus cressonii Dalla Torrp:, Cat. Hym., 1901, p. 539 (not Ashmead). 



Ashmead used the combination Mesosterms cressonii in 1900 for the 

 preoccupied Mesostenus insidaris (Cresson). Cresson never de- 

 scribed a Mesostenine under the name insularis, and the only possible 

 inference is that Ashmead misread Mesoleptfus insularis Cresson as 

 Mesostenus insularis. Mesoleptus iiisularis Cresson isi certainly not 

 a Mesostenine, but Ashmead's use of the combination Mesostenus 

 cressonii antedates that of Dalla Torre and renders a new name for 

 the present species necessary. 



Discussion based on type and a specimen compared with the type 

 by Cushman. 



Female. — Length, 9 mm. 



Distinct from orha., which it superficially resembles rather closely, 

 by single median mesothoracic spot and by the following characters : 



Face densely punctate, cheeks and temples sparsely so; teeth of 

 mandible equal ; flagellum distinctly thickened and flattened below 

 beyond middle and tapering toward apex, the basal joints hardly as 

 slender; mesoscutum densely, finely punctate, opaque, mesopleurmn 

 densely, finely punctate, striate only in impressions; metapleurum 

 more coarsely punctate, propodeum finely reticulate rugose without 

 an}^ striation apically, apophyses small, acute; front tibia not at all 

 inflated. Abdomen narroAver, especially the first tergite, the petiole 

 slender cylindrical ; second tergite impunctate. 



Clypeus entirely white, mesoscutum with a single median spot, 

 first tergite white only at apex; hind coxa white, black below at base 

 and at apex above; joints 1 and 4 of hind tarsus red, 2 and 3 white, 

 5 black. 



The type is from Louisiana and the United States National Mu- 

 seum specimen from Easley, S. C, J. O. Pepper, collector. 



