AMERICAN DIPTERA. 241 



Johnson, which are the type specimens of this genus. There 

 is also a specimen at the National Museum. 



This species is easily distinguished from Ceraturgus cruciatus 

 Say, of which it was made a synonym by Baron Osten Sacken, 

 by its more robust abdomen and by its terminal antennal 

 segment being free from pubescence, more rounded and bear- 

 ing a distinct spine, as above noted. The general color of 

 the body is golden, due to the golden bloom, while the black 

 of cruciatus is much more pronounced. 



MYELAPHUS, 



Myelaphus Bigot, Bull. Soc. Ent. France, 1882, XCI, No. 9, p. 



112. 

 Myelaphus Williston, Trans. Am. Ent. Soc, XI, 5, 1884. 



Antennae apparently with five segments ; first segment about 

 three times as long as the second, third elongate, fourth and 

 fifth of nearly equal length, third and fourth at the tip with 

 two lobes, or processes, reaching to about the middle of the 

 following segment. 



Head broader than the thorax, considerably broader than 

 high. Face a little less than one-third as wide as the head, its 

 sides very nearly parallel, diverging but very slightly below, 

 bare, smooth and polished, on the oral margin in front with 

 a thin row of moderately long bristles; in profile gently reced- 

 ing, above the middle with a moderately large obtuse tubercle 

 (wanting in lobicornis), not reaching quite as far forward as 

 the base of the antennas, between antennas and facial tubercle 

 gently concave, below the tubercle to the oral margin con- 

 siderably receding, nearly straight; the oral margin in front 

 is distinctly above the lower borders of the eyes, so that the 

 lateral margins of the mouth are considerably oblique and 

 straight. Antennae situated upon a large obtuse tubercle, not 

 quite as long as the dorsum of the thorax, composed of five 

 segments as in Ceraturgus, all of which are distinctly separated 

 from each other; first segment cylindrical, elongate, rather 

 more than three times as long as the second; second segment 

 short, but little longer than broad; third segment distinctly 

 longer than the first two put together, somewhat compressed, 



TRANS. AM. ENT. SOC, XXXV. (31) JULY, 1909. 



