E. T. CRESSON, JR. 63 



Colorado: Grant, Denver Park, 9500-10,000 ft. alt., July 27, (L. O. Jack- 

 son), [BioL Surv.]. 



? >JEW Mexico: Fort Wingate, July 25, (J. Woodgate), [A. N. S. P.]. 



Chaetomacera elata variety triangularis Loew 



1861. Tctanocera triangularis Loew, Beri. Ent. Zeit., v, 344. (Cent, i, 



69.) 

 ? 1881. Tctanocera montana Day, Can. Ent., xiii, 87. 



The wings here have no infuscation along the costa, the third 

 antennal joint is more pointed, the mesonotal stripes distinct, 

 the median frontal stripes abbreviated. 



Described from a male from English River, Canada, (Kenni- 

 cott) . 



This form probably includes specimens having the costa more 

 or less infuscated apically. I have seen the following material 

 which may be considered typical. 



Specimens Examined. — 4 cf , 5 9 • 



Canada: Carbonate, Columbia River, British Columbia, July 7-12, (J. C. 

 Bradley), [Cornell] ; Toronto, Ontario, May 5, [Johnson]. 

 New York: Ithaea, May to August, [Cornell]. 



Chaetomacera vicina Macquart (PL I, fig. 7; pi. II, fig. 28.) 

 1843. Tctanocera ricina Macquart, Dipt. Exot., ii, (3), 180, pi. 24, f. 7. 

 1847. Tetanocera plumosa Loew, Stett. Ent. Zeit., viii, 201, (Sitka). 

 1849. Tetanocera struthio Walker, Br. Mus. List, iv, 1086, (Canada). 



This species is at present known under Loew's name and has 

 always been confused with plebeia. It is, however, very distinct 

 and easily distinguished by the presence of the characteristic 

 femoral bristle. Tetanocera vicina Macquart and Pherhina vicina 

 Desvoidy (1830) are not homonyms, as considered by Loew.'i 

 Therefore Macquart's name has priority over Loew's plumosa. 



cf, 9. In structure and general appearance similar to plebeia, but ui 

 color somewhat darker. Abdomen with a more or less distinct median stripe 

 of brown; orbital spot at antennae usually distinct, black; second antennal 

 joint robust, about three times as long as tiiird; pleural stripe distinct; middle 

 femora with a distinct bristle on posterior surface near apex; hind cross- vein 

 strongly arcuate and often angularly bent. Length. — to 9 mm. 



This species Avas originally described from Philadelphia. I 

 have examined specimens from California and they show but 

 little variation from those from the Atlantic region. However, 

 there are some forms in the series examined that suggest possible 

 varieties, but I do not attempt to separate them now. 



11 Monograph, i, 122. 



TRANS. AM. ENT. SOC, XLVI. 



