470 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 90 



All these characters are relative, and were it not for the widely 

 different type localities and the totally different hosts I would hesitate 

 to consider indiscretus a different species from 7ne.r.icanys, but believe 

 it advisable to do so under the circumstances. 



Type locality. — Bar Harbor, ]\Iaine. 



TijjJe.—V.S.NM. No. 54264. 



Described from four females received from A. E. Brower, Two of 

 these (one, holotype) are labeled "Pars, of PhyUotoma nemorata 

 Fallen, bred June 9, 1936." The other two were bred on the same 

 date from birch leaves containing the same PhyUotoma. 



7. MONODONTOMERUS OBSCURUS Westwood 



Monodoniomerus obscurus Westwood, Philos. Mag., ser. S, vol. 2, p. 443, 1833. 

 Monodontomerus sp. Rau, Ann. Ent. Soc. Amer., vol. 30, p. 338, 1937. 



This species apparently has not previously been recognized from 

 America. In Europe it is variously recorded from hymenopterous, 

 dipterous, and lepidopterous hosts. Among the hymenopterous 

 hosts are at least three species of the genus Osmia. O. W. Richards ^ 

 recorded it as a parasite of Osmia emarginata Lepiney in the Pyrenees 

 Mountains, and Marechal ^ reared numerous specimens from nests 

 of 0. cornuta (Latreille) and 0. rufa (Linnaeus) collected at Liege, 

 Belgium. 



Three specimens of a Monodontomerus said to have emerged from a 

 cocoon of Osmia lignaria Say taken at Nesco, Crawford County, Mo., 

 were recently received from Phil Rau of St. Louis. The Osmia had 

 utilized an empty mmd cell of Sceliphron cementarium (Drury) as a 

 pupation chamber. Five other specimens of the same Monodonto- 

 merus reared from Osmia cordata Robertson had previously been sent 

 in by Mr. Rau. These formed the basis for the note on Monodonto- 

 merus sp. by Rau cited above in synonymy. Other specimens m the 

 United States National Museum indistinguishable from the above 

 are as follows: Two said to have emerged from cells of 0. lignaria 

 collected at Nyack, N. Y., in 1885, by J. L. Zabriskie; one taken at 

 Mount Pleasant, Iowa, June 7, 1933, by H. E. Jacques; and four 

 collected at Washmgton, D. C, without further data. 



These specimens have been com.pared with two specimens from 

 Europe identified by F. Ruschka as Monodontomerus obscurus and 

 also with Westwood 's original description of that species, and they 

 seem to agree so completely that I am convinced they are Westwood's 

 species. 



M. obscurus differs from other known species found in America 

 by having the surface of the propodeum lying between the median 



2 Ent. Monthly Mag., vol. 6fi, p. 91, 1930. 



3 Soc. Ent. France Livre Centenalre, p. 509, 1932. 



