106 AMERICAN HYMENOPTERA. 



space between the tops of the eyes, a median ridge running from the 

 anterior to or slightly below the deep, bordered antennal fossae ; eyes 

 emarginate, large, reaching almost to the base of the mandibles ; 

 clypeus bluntly pointed, clypeal foveas deep ; mandibles broad, stout, 

 punctured. 



Thorax shining, fulvo-ferruginous ; thoracic sutures and parapsidal 

 furrows distinct, more or less crenulated ; metathorax very coarsely 

 and irregularly reticulate throughout, with small but distinct protuber- 

 ances at the anterior margin, one in the middle and one on each side. 



Wings hyaline, the anterior with the apical two-thirds of the radial 

 cell, a spot in the upper basal third of the cubital cell and a stripe along 

 the basal vein, black ; the median cell is slightly infuscated, suggesting 

 that, in some specimens, it may be black; nervulus interstitial, ner- 

 vellus broken far above the middle, near the cubital vein. 



Legs smooth and shining, dark fulvous, sometimes more or less 

 fuscous. Abdomen ferruginous, not very strongly compressed ; apex 

 of the first segment and dorsum of the second black, the rest slightly 

 tinged with fuscous. 



Described from one male specimen. 



Type. — 6^ . U. S. National Museum. 



I have named this species in honor of Mr. A. H. Arm- 

 strong, a worker on Hymenoptera whose untimely death has 

 undoubtedly prevented valuable contributions to our knowl- 

 edge of this group. 



Distribution. — San Francisco Mountains, Santo Domingo, 

 West Indies, September. 



Genus THYREOBON Br. 



Thyreodon'&xvWh, Hist. Nat. Ins. Hym., IV, p. 150, November.. 1846. 



" Cresson, Proc. Acad. Nat. Sci., Phila., p. 375 (January, 



1873) 1874. 



Taschenberg, Zeitschr. f. d. Ges. Natur., 46, p. 425. ...1876. 



Provancher, Faun. Ent. Can., Hym., IV, p. 352 1883. 



Cameron, Biol. Centr. Amer., Hym., I, p. 288 1886. 



Ashmead, Smith's Ins. N. J., p. 580 1900. 



Trans. Ent. Soc. Lond., pp. 270, 354 1900. 



Proc. U. S. Nat. Mus., No. 1206, pp. 87, 188 

 (Vol. XXIII, 1901). Classification of Ichneu- 

 mon Flies 1900. 



Dalla Torre, Cat. Hym., Ill, p. 185 1901. 



Tipulophion Kriechbaumer, Zeitschr. Hym. Dipt., I, p. 75 1901. 



Aglaophion Cameron, Journ. Straits Branch Soc, p. 131 1903. 



T^jj/r^orfow Szepligeti, Gen. Ins., Hym., 34me Fasc, p. 25 1905. 



Schmiedeknecht, Opusc. Ichn., XVIII, p. 1418 1908. 



