CHARLES W. HOOKER, 



103 



Ophion atriventris Dalla Torre, Idem, p. 188 1901. 



Tipulopkion rufithorax Schulz, Zeits. f. Syst. Hym. Dipt., Ill, 



p. 249 1903. 



Thyreodon rufithorax Szepligeti, Gen. Ins., Hym., 34'ne Fasc>, p. 



25, n. 20 1905. 



Ophion atriventris Szepligeti, Idem, p. 31, n. 90 1905. 



Macrophion ornatus Szepligeti, Idem, p. 33, n. 2, 9 , pi. 2, fig. 17. .1905. 



Tipulopkion rufithorax Schulz, Spolia Hym., p. 97, 1906, 



Macrophion ornatus Schmiedeknecht, Opusc. Ichn., XVIII, p. 



420 1908. 



Thorax fulvous ; fia^elluni of anten7ice afid abdomeyi black ; wings 

 hyaline, with the radial and more or less of the median and cubital cells 

 dark fuliginous ; nietathorax coarsely reticulate. 



Length, 29-33 mm. ; wing, 23-26 mm, ; spread, 48-55 mm. ; antennae, 

 22-23 mm. 



Head with vertex and flagellum of antennse black ; scape fulvo- 

 ferruginous ; ocelli large and prominent, entirely filling the space be- 

 tween the tops of the eyes; eyes large, emarginate ; face narrow; cly- 

 peal fovese distinct. 



Thorax flavous to dark fulvous, smooth and shining except on the 

 mesonotum and scutellum which are finely punctured ; mesonotum 

 with deep parapsidal furrows converging toward the base of the scu- 

 tellum ; metathorax somewhat rounded behind and very coarsely reticu- 

 lated. 



Wings hyaline, with radial and more or less of the cubital cells dark 

 fuliginous, stigma lacking ; nervulus postfurcal to interstitial ; nervel- 

 lus broken well above the middle ; discocubital vein arcuate. 



Legs with posterior coxae and trochanters, and the four anterior legs 

 except the feet and intermediate tarsi, flavous; the rest black. 



Abdomen smooth and shining, black with a bluish reflection, some- 

 times with a slight reddish ground color showing through. 



In describing this species I have examined the types of A. 

 thoracicus Ashm. and atriventris Cress., comparing them and 

 one other specimen with the various descriptions. 



Type. — 9 . No. 71, American Entomological Society. 



This distinct species is easily recognized by the contrast- 

 ing colors of the body, but owing to variation in the color of 

 the thorax, and the extent of fuliginous in the wings, it has 

 been described with several different species and confused 

 with related forms. The thorax is normally light fulvous, 

 but occasionally has a slight reddish tinge and is rarely fer- 

 ruginous. The amount of fuliginous in the wings varies 



TRANS. AM. HNT. SCO. , XXX VIII. 



