E. T. CRESSON, JR. 57 



valida-group 



Secoiifl antennal joint short, third tapering; wings maculate. 

 A group of species apparentl}^ belonging to this genus, but which 

 are peculiar in having the wings marked with fuscous bars be- 

 tween some of the veins. Contains valida and dara. 



uni color-group 



Second antennal joint short, third tapering; wings immaculate 

 except cloudings at the cross-veins. An unsatisfactory group 

 containing brevis and unicolor. The latter, except for size, may 

 very easily be confused with some forms of elata. 



f/a/a-group 



Second antennal joint generally elongate, third distinctly taper- 

 ing, sometimes sharply pointed; wings immaculate excepting 

 the cross-veins and costal margin, and, rarely longitudinally 

 streaked with fuscous between the veins. The typical, and a 

 homogeneous, group, with only two or three well-marked species, 

 containing elata with its several forms, vicina, ferruginea, and 

 sUvatica. 



Chaetomacera valida Loew (PI. I, fig. 12; pi. II, fig. 30.) 

 1862. Tetanocera valida Loew, Mon. Dipt. N. Amer., i, 110. 



This and the following species form a group with maculate 

 wings. The second antennal johit is rather short, usually dis- 

 tinctly broader than long. 



(f, 9- Frons immaculate, the polished orbital stripe extending beyond 

 anterior bristle; \\'ings with fuscous spots in the marginal cell and the hind 

 cross-vein perpendicular. The spots in the marginal cell are probably sub- 

 ject to some variation. Length. — 6 to 7 mm. 



Specimens Examiited. — 5 cf,8 9. 



Maine: Capens, July 19; Machias, July 24, (all C. W. Johnson), [all 

 B. S. N. H.]. 



New Hampshire: Mount Washington, [B. S. N. H.]. 



Vermont: St. Johnsbury, June 28, (C. W. Johnson), [B. S. N. H.]. 



Massachusetts: Auburndale, August 1; Bashbish, June 27; Gloucester, 

 August 30, (all C. W. Johnson), [all B. S. N. H.]. 



Rhode Island: Buttonwoods, June 20, (C. W. Johnson), [B. S. N. H.j. 



Connecticut: Norvvalk, July 9, (I. N. Gabrielson), [Biol. Surv.]. 



New York: Ellis to Slaterville, June 13, (MacGillivray & J. C. Bradley), 

 [Cornell]. 



Illinois: (Dr. Lewis), [A. N. S. P.]. 



TRANS. AM. ENT. SOC, XLVI. 



