OF WASHINGTON, VOLUME XVII, 1915 187 



Railliet, and that Kellogg and Nakayama have apparently over- 

 looked or forgotten this fact, all argue for the likelihood that 

 T. hermsi is a redescription of T. penicillatus. 



MAGROSIAGON FLAVIPENNIS IN COCOON OF BEMBEX 



SPINOL/E. 



(Coleoptera, Rhipiphoridoe) 

 BY H. S. BARBER, Bureau of Entomology. 



A fully matured specimen of this parasitic beetle was found 

 by MT. J. B. Parker in the still solid cocoon of a wasp (Bembex 

 xpinolce), in a sand pile at Brookland, D. C., June 26, 1914, which 

 I believe is the first host record of this species. Two other host 

 records of the genus in North America are known to the writer. 

 Lugger 1884 (Psyche, vol. 4, p. 211) being quoted as saying that 

 the larva of Tiphia is often parasitized by a (Rhipiphorus) Ma- 

 crosiagon (which statement was commented upon by Riley, 1. c., 

 p. 224) and Wolcott 1914 (Journ. Econ. Ent., vol. 7, p. 387) allud- 

 ing to the parasitism of Tiphia cocoons by (Rhipiphorus} Macrosia- 

 gon pectinatus Fabr., and perhaps another species, in Missouri 

 and Illinois, the details of the life-history not being known. 



A most interesting account of a European species of this genus, 

 Ennnenadia flabellata Fabr. (this name now appearing in the 

 Reitter catalogue as a synonym of Macrosiagon ferruginea Fab.), 

 was published by Chobaut 1891 (Ann. Soc. Ent. Fr., vol. 60, 

 pp. 447-456) in which the rearing of this parasite from the larvae 

 of Odynerus is recorded, and also the oviposition and first stage 

 larvae or triungulinids are described. This last writer cites and 

 comments upon the account by Chapman 18JTO (Ann. and Mag. 

 Nat. Hist., vol. VI, 4 ser., pp. 314-326, pi. XVI) and Murray 

 1870 (I.e., pp. 326-328) of the life-history of Metcecus paradoxus 

 (Rhipiphorus), parasitic in the nests of Vespa vulgar^. 



Two species of Rhipiphorus (Myodites of our catalogs) have 

 been recorded by Le Conte 1880 (Monthly Proc. Ent. Sec. Anul. 

 Xat. Sci. Philadelphia, Dec. 13, 1880, p. XXIII) as parasitic, 

 one on Augochlom />nr<i and the other on NomianevadensisCres- 

 SOM. [The determination of this latter is wrong, the insect being 

 Nomia paltoni Ckll.]. Melander and Brues 1903 (Biol. Bull.. 

 vol. 5, No. 1, p. 26) suggest the parasitism of (Myodites) Rhipi- 

 l>hrnK fdxciatus Say on Halictus pruino.tus Robertson. Pierce 

 l'.M)4 (Nebr. Univ. "Studies, vol. 4, No. 2, pp. 153-189) records 

 the oviposition of (Myodites) Rhipiphorus soli<la<iinix in the 

 flowers of Solidago, the transmission of the triungulinids to sun- 

 flowers by many different species of bees, where the real ho>t . 



