AET. 14 ICHNEUMON-FLIES OF GENUS POLYCYRTUS — CUSHMAN 53 

 MESOSTENUS SUBTENUIS Crcsson 



Mesostenus subtenuis Cresson, Proc. Ent. Soc. Phila., vol. 4, 1865, p. 29, male. 



This is probably a Polycyrtus and very likely the same as the 

 specimen described by BruUe as the male of his trilineatus. The 

 descriptions show no differences. Brulle's male was from Haiti and 

 Cresson's type from Cuba, while the female of Brulle's species was 

 from Guiana and obviously of a different species from the male. 



SPECIES ERRONEOUSLY REFERRED TO POLYCYRTUS 



Listrognathus aTboTiiaculatus (Cresson) was referred to PoZycyr^ii^ 

 by Viereck (Proc. U. S. Nat. Mus., vol. 42, 1912, p. 644) . 



Polycyrtus % cv/rvilineatus Cameron (Proc. Linn. Soc. N. S. Wales, 

 vol. 37, pt. 1, 1912, p. 175). This Australian species is surely not a 

 Polycyrtus, the possession of the frontal horn being apparently the 

 only reason for its tentative assignment to the genus. The sculpture, 

 many feature of structure, and the type of color pattern are foreign 

 to Polycyrtus. 



Genus POLYCYRTUS Spinola 



KETT TO SPECIES 



This key is essentially that of Szepligeti ^ expanded to include all 

 the described species of Polycyrtus. Because of the nature of most 

 of the descriptions it was necessary to employ largely characters of 

 color. The key is, therefore, far from entirely satisfactory, but will 

 be found helpful in determination of specimens by reduction of the 

 number of descriptions to be consulted. 



1. Propodeum without basal carina ; frontal horn trihedral, 



quadrisulcatus Spinola. 

 Propodeum with basal carina; frontal horn usually conical 2. 



2. Abdomen ferruginous or testaceous 3. 



Abdomen more or less black, segments often margined with white 38. 



3. Only the head black 4. 



Thorax also more or less black or piceous 26. 



4. Head with at most the clypeus red or pale 5. 



Head with at least the face or orbits pale 18. 



5. Clypeus pale or red 6. 



Clypeus black 12. 



(curvispina Cameron [Costa Rica]. Description says "ore albo," 

 but whether clypeus is included is not clear. Can be run no farther 

 in key on basis of original description.) 



6. Clypeus red 7. 



Clypeus pale 8. 



'Ann. Mus. Nat. Hung., vol. 14, 1916, p. 268. 



