AMERICAN DIPTERA. 357 



discolor. From the original description it would be hard to 

 separate the female of discolor from bilineata; in fact, while 

 studying the types at the M. C. Z., I made the note that I be- 

 lieved them the same species. That was when I had very 

 little material. Now that I have a much larger series, I feel 

 certain that they are distinct. Loew founded bilineata on 

 two female specimens from Cuba, and I have never seen a 

 female of discolor from farther south than North Carolina. 

 Of the numerous specimens of bilineata before me, all from 

 Florida, I find the males do not differ from the females, which 

 could not be so were bilineata and discolor the same. For 

 variation in the thoracic stripes, see note under symmacha. 



Deroniyia bigoti. 



Saropogon bigoti Bellardi, Saggio, II, 70, 1861. 

 " 9- — Length of body 30 mm.; spread of wings 54 wot. — Totus fer- 

 ruginea-fuscus. Thorace obsolete nigro-maculato, dorso setuloso; ab- 



domine ad basim ferrugineo-fusco, ad apicem . Pedibus longis, 



multi spinosis; spines crassis, brevibus, nigris. Alis longis, flavis: 

 cellula prima posteriore ad marginem sub angustata, quarta clausa." 



Type. — Bigot collection. 



Habitat. — -Mexico, So. Ariz. (Aug.) ; Salt Lake City, Utah ; 

 St. Augustine and Ormond, Fla. (C. W. Johnson). 



Bellardi made his description from a very poorly preserved 

 specimen, and as it stands, might apply to any of several 

 species. It is, however, a very large insect, and relying more 

 upon this fact than the description, I have identified four 

 specimens, three from southern Arizona and one from Utah. 

 They have a very broad robust thorax and stout abdomen; 

 the two dorsal stripes of two are reddish-brown, of another 

 more blackish, and of the fourth, a greased specimen, hardly 

 perceptible. The antennae and palpi are wholly yellowish, 

 the latter with pale hair, the former with black. Mystax 

 rather thin, whitish. Bristles of occiput, before the halteres, 

 and on the sides of the first abdominal segments yellowish; 

 those on thoracic dorsum and scute] lum black. In all my 

 specimens I notice a small oblique black spot near the anterior 

 lateral margins of segments 2-5 in the female, in the male on 

 segments 2-6; behind which the segments are a pale golden 

 pruinose. 



TRANS. AM. ENT. SOC, XXXV. SEPTEMBER, 1909 



