NO. 2334. NORTH AMERICAN ICHNEVMON-FLIES—CUSHMAN. 261 



function as genotypes of the genera in which they were the first in- 

 cluded species. Many of these genera are based at least partially on 

 characters that are certainly not of generic value. But until the 

 genera are defined by properly fixed types the improperly fixed 

 types must be exchided from the genera, and, if necessary, new ge- 

 neric names, assigned to them. 



Genus PANARGYROPS Foerster. 



Four nearctic species of this genus are known to mo, and a note 

 by S. A. Rohwer in regard to the type of (Mesostenus) Mesoleptus 

 sericeus (Provancher) indicates that it too belongs here. The follow- 

 ing key will separate the five species in the female. The male of 

 only one species is known to me. 



KEY TO NORTH AMERICAN SPECIES (FEMALES). 



1. Thorax more or less rufous peregrinus (Creeson). 



Thorax entirely black 2. 



2. Front and middle coxae and trochanters white; hind trochanters more or 



less blackish; scape white below 3. 



Front and middle coxae and trochanters testaceous; hind trochanters not at all 

 blackish ; scape not wMte below 4. 



3. A line in front of tegula white sericeus (Provancher). 



White in front of tegula confined to humeral angle of pronotum . . tibialis (Cushman), 



4. Tegulae pale; ovipositor barely two- thirds as long as abdomen or twice as 



long as first tergite texanus, new species. 



Tegulae fuscous; ovipositor nearly as long as abdomen or three times as long as 

 first tergite pacificus, new species. 



PANARGYROPS SERICEUS (Provancher). 



Mesostenus sericeus Provancher, Nat. Can., vol 7, 1875, p. 264, male. 



Mesostenus sericeus Provancher, Nat. Can., vol. 11, 1879, p. Ill, female. 



Mesostenus sericeus Provancher, Faun. Nat. Can. Hym., 1883, p. 345, female, 

 male. 



Mesoleptus sericeus (Provancher), Faun. Ent. Can. Hym., 1883, p. 395. 



Mesoleptus sericeus (Provancher), Addit. Faun. Ent. Can., Hym., 1889, p. 362. 

 This species may have as a synonym tibialis (Cushman) ; but in a 

 series of 17 specimens of both sexes of tibialis, every one has the 

 white of the pronotum confined to a small spot on the humeral angle, 

 and the black of the hind trochanter is in almost every case con- 

 fined to the apical joint. Aside from these two characters there is 

 nothing in Provancher's description that does not apply equally as 

 well to tibialis. 



PANARGYROPS TIBIALIS (Cushman). 



Bathythrix tibialis Cushman, Proc. U. S. Nat. Mus., vol. 53, 1917, p. 458, female, 



male. 

 Panargyrops tibialis (Cushman), Proc. U. S. Nat. Mus., vol. 55, 1919, p. 528. 



A series of eight females and four males reared from the type host 

 and received subsequent to the publication of the original descrip- 



