38 PEOCEEDINGS OF THE NATIONAL. MUSEUM vol.74 



Genus POLYAENUS Cresson 



Pohjaenus Cbesson, Proc. Acad. Nat. Sci. Phila., 1873, p. 570. Genotype. — 

 Polyaenus ectypus Cresson. 



A tropical genus represented in our fauna by a single species 

 largely southern in its range but extending on the Atlantic seaboard 

 as far north as Long Island and southern Connecticut. 



Closely related to Cryptwopsis Ashmead, from which it is dis- 

 tinguishable by the Iscornute frons, the small convex scutellum, the 

 longer and more spinelike apophyses, siltlike propodeal spiracles, 

 and the closed areolet, which is, however, of the ^ame form as that 

 of Grypturopsis^ antefurcal nervulus, the usually longer sheath, and || 

 the form of the ovipositor, which is stout, strongly compressed, 

 deeper toward apex than at base and more swordlike than sagittate 

 at apex. 



The two frontal horns are sometimes placed on a common base ^o 

 that they form really a single double pointed horn; and the areolet 

 varies considerably in relative length and breadth with the recurrent 

 interstitial or more or less antefurcal. 



POLYAENUS SPINARIUS (BruUe) 



Figs. 1(Z, 3fc, &i 



Mesostenus spinarius Brxjixe, Hist. Nat. Ins. Hym., vol. 4, 1846, p. 227, female. 

 Mesostemis albopicttis Cresson, Proc. Ent. Soc. Phila., vol. 3, 1864, p. 312 (not 



Smith), male. 

 Mesostenus delawarensis Dalla Torre, Cat. Hym., 1901-1902, p. 540. 

 Polyaenus spinarius Schmiedeknecht, Gen. Ins., fasc. 75, 1908, p. 68. 

 Mesostenus spinarius Viereck in Smith : Insects of N. J., 1910, p. 630. 

 Mesostenidea (Polyaenus) spinaria Viereck, Hym. Conn. (1916), 1917, p. 329. 

 Polyaenus spinarius Cushman, Journ. Wash. Acad. Sci., vol. 15, 1925, p. 391. 



Discussion based on Brulle's description, type, and homotype 

 (Cushman) of aJbopicfvs, and 9 females and 12 other males in the 

 National collection. 



Femxde. — Length, 11-15 mm. 



Head ^ubpolished behind and along anterior orbits ; frons medially 

 obliquely striate, with a median carina, frontal horns small; face 

 with a median rounded and sparsely punctate area, the impression on 

 each side rugose; temples sharply sloping, nearly flat; cheeks 

 broader than temples, convex, lower end of occipital carina sinuate 

 and slightly prominent; eyes subparallel within; malar space three- 

 fourths a^ long as basal width of mandible; antennae about three- 

 fourths as long as body; flagellar joint 1 distinctly longer than 2, 

 which is slightly longer than 3 ; 4 two-thirds as long as 3. Thorax 

 shining, coarsely sculptured ; pronotum rugose except along anterior 

 margin, dorsal lateral margins swollen, epomia reaching nearly to 

 dorsal margin ; mesoscutum coarsely punctate, notauli complete, deep. 



