No. 2320. TRIBE AC0ENITINI—CU8HMAN AND ROHWER. 521 



Eather slender; ovipositor shorter than the thorax and abdomen; 

 hind coxae of female rufous to black; face of female usually black 

 with orbital lines and a small central spot, but occasionally entirely 

 yellow; mesepisternum usually black in female, but in one spechnen 

 with a yellow band; propodeum in female black, with the posterior 

 face yellow; thorax of male largely yellow; recurrent interstitial or 

 antefurcal. 



Distribution. — West Virginia (Cresson); Michigan (Davis); Dela- 

 ware Water Gap, New Jersey; Jackson's (P. R. Myers), Cabin John 

 Bridge (R. M. Fouts), Maryland; Great Falls (H. L. Viereck), Falls 

 Church (Wm. Middleton), Springfield (T. E. Snyder), Virginia. 



Host. — Reared as a larval parasite of Strangalia hicolor by T. E. 

 Snyder. 



GENERA NOT REPRESENTED IN NORTH AMERICAN FAUNA. 



Apparently the three genera, Mesoclistus Foerster, Acoenites Latre- 

 ille, and Phaenolohus Foerster, have not been discovered in North 

 America. Specim.ens of the genotypes of all of these are in the Na- 

 tional Museum collection and have been used in devising the key to 

 genera. The features mentioned in the key are apparently so char- 

 acteristic that further discussion of the genera individually is not 

 necessary. 



Chorischizus Foerster was synonymized by Roman ^ with Phaeriol- 

 ohus Foerster, in which he was undoubtedly correct. The only char- 

 acter by which these have been separated is the possession or lack 

 of the ramulus — a character of not more than specific value. We 

 have examined specimens of the genotypes of both genera and find 

 no differences of generic value. 



Apparently nothing is known of the host relations of Mesoclistus 

 and Acoenites, and there is only one record referring to the host of 

 PJiaenolohus. Brischke recorded Phaenolohus arator (Rossi) as a para- 

 site of Sesiaformicaeformis Esper. 



No North American species has ever been refen-ed to Mesoclistus or 

 PJiaenolohus, but several have been described in Acoenites. These 

 are Us ted below and their proper systematic position is indicated. 



SPECIES ERRONEOUSLY REFERRED TO ACOENITES. 



Acoenites canadensis Provancher, Nat. Can., vol. 12, 1880, p. 10, male. 

 Acoenites flavipes Provancher, Nat. Can., vol. 6, 1874, p. 80, female. 



Mr. Rohwer has examined the types of the above two species. He 

 pronounces them to be species of Coleocentrus, and cancbdensis to be 

 the male oijiavipes. The two species are thus treated on page 507 of 

 this paper. 



Acoenites decorus Say, Best. Journ. Nat. Hist., vol. 1, 1836, p. 248, male and female. 



Referred by Cresson^ to Arotes (see p. 517). 



' Ent. Tidsk., 1910, D. 184. s Trans. Amer Ent. Soc., vol. 4, 1872, p. 164. 



