58 PROCEEDINGS OF THE NATIONAL MUSEUM vol. G9 



This species is very similar to gibhosus and hrevicornis, but can be 

 distinguished from both as pointed out in the above discussions of 

 those species. Face elongate, narrow; malar space usually nearly as 

 long as the eyes; palpi slender, as in hrevicornift', antennae slender, 

 usually 25 to 27 segmented; parapsidal furrows impressed, narrow, 

 usually minutely foveolate; mesonotal lobes usually with scattered 

 shallow punctures; propodeum about as in hrevicornis; mesopleural 

 furrow very narrow, minutely foveolate or punctate; second cubital 

 cell usually distinctly four-sided, though very narrow above, on the 

 radius; first abscissa of mediella longer than the second; abdomen 

 mostly polished, the first tergite usually only faintly striate, the sec- 

 ond sometimes very weakly sculptured in part; ovipositor sheaths 

 about two-thirds as long as the body. Head, thorax, and abdomen 

 black, very rarely the second tergite a little tinged with reddish; wings 

 a little dusky, not deeply infu-mated; legs usually as described for 

 hrevicornis. 



In addition to the types of parvus and solidaginis, I have seen 

 considerable material in the United States National Museum, all 

 collected specimens, from a wide range of localities, including St. 

 Jolm and Nerepis, New Brunswick; Hagerstown, Maryland ; White 

 River, South Dakota; Riley County, Kansas; West Point, Nebraska; 

 Colorado; Arlington, Virginia; Easton, Washington; and Los 

 Angeles, California; this collection also includes a homotype, deter- 

 mined by S, A, Rohwer, which is without locality data. 



32. BASSUS ANNULIPES (Cresson) 



Microdus annulipes Cresson, Canad. Ent., vol. 5, 1873, p. 53. 



Microdus earinoides Cresson, Canad. Ent., vol. 5, 1873, p. 54. 



Microdus grapholithae Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1889 (1888),' 



p. 639. 

 Microdus albocinctus Ashmead, Proc. U. S. Nat. Mus., vol. 11, 1889 (1888), 



p. 639. 

 Bassus waldeni Viereck, Bull. 22 Conn. Geol. and Nat. Hist. Survey, 1917 (1916), 



pp. 228 and 229. 



Type. — The types of annulipes and earinoides are in the Phila- 

 delphia Academy of Science; those of grapholithae and alhocinctus are 

 in the United States National Museum; and that of waldeni is in the 

 agriculture experiment station at New Haven, Connecticut. 



A study of all of these types has convinced me that they represent 

 but a single species. The unusually wide variations are doubtless 

 responsible for the description of the species under so many names. 

 The type of earinoides, which has the body practically entirely black, 

 represents one extreme, while that of grapholithae, which is almost 

 wholly testaceous, represents the other, and the types of annulipes, 

 alhocinctus, and waldeni fall between these extremes. The National 

 Museum material of this species is rather extensive and contains a 

 good series of intergrades. 



