72 PROCEEDJMiS OF THE NATION AL MUSEUM. vol. 49. 



48. Ovipositor about half as long as tlie abdomen; two diverging fuiTows on the second 

 tergite prolonged nearly to the suturif orm articulation . . melanocephalus Aehmead . 

 0\apositor concealed or very short; diverging furrows on the second tergite im- 

 pressed only at the base of the tergite 49. 



40. Thorax depressed, flattened above, wider between the wings than high dorso- 

 ventrally ; coalesced second and third tergites granularly sculptured from base 



to apex siriativentris, new species. 



Thorax not depressed nor flattened above, not broader between the wings than 

 high; coalesced second and third tergites sculptured before the suturiform 



articulation and either smooth or sculptured behind 50. 



f)0. Coalesced second and tliird tergites sculptured from base to apex, or at least 

 beyond the suturiform articulation ; propodeum smooth or very finely rugu- 



lose 51. 



Coalesced second and third tergites smooth beyond the suturiform articulation; 



propodeum rugose all over 53. 



51. Propodetnn smooth and polished; second tergite black or blackish. 



suturalis Gahan. 

 Propodeum finely rugulose at least laterally and posteriorly; second tergite yel- 

 lowish 52. 



r^2. Propodeum opaque, granularly punctate all over; coalesced second and third 

 tergites wholly reddish stramineous, following segments only slightly darker; 



pleurae and propodeum reddish gracillariac, new species. 



Propodeum finely punctate laterally and posteriorly, more or less shining above; 

 first tergite blackish; coalesced second and third tergites beyond the suturiform 

 articulation black as are the following tergites; propodeum and pleurae black. 



nanus Provancher. 

 5.3. Mandibles with the ventral margin complete; mesopleui-al impression crenulate. 



oscinidis Ashmead. 



Mandibles with a deep notch or tooth on the ventral margin near the base; meso- 



pleural impression smooth amerkanus, new species. 



OPIUS SECUNDUS Viereck. 



Diachasma secunda Viereck, Trans. Kansas Acad. Sci., vol. 19, 1905, p. 272. 



The type of this species has not been seen by the wTiter and it 

 may prove not to be an Opiine. The striate mesopleurae and the 

 wrinkled abdominal tergites apparently distinguish it from any other 

 species in our fauna. 



Habitat. — Kansas. 



Host. — Unknown. 



OPIUS APPALACHICOLUS Viereck. 



Diachasma ajrpalachicola Viereck, Trans. Kansas Acad. Sci., vol. 19, 1905, p. 273. 



Type in the Snow collection and not examined. Apparently differs 

 from all other species in the granularly sculptured dorsum of the 

 thorax. 



Hahitat. — Kansas. 



.ffosi.— Unknown„ 



