AMERICAN DIPTERA. 161 



Williston's description of ch(]etophora (Syii. Syrph., pp. 149-50), as 

 follows : 



Length about 8 mm. Face, front and antennae brownish yellow, the front 

 appearing yellowish brown when viewed from above, the orbits with a very nar- 

 row, inconspicuous, white polliuose line. Face strongly produced downward, 

 lower border of cheeks forming an angle of about 120 degrees with plane of occi- 

 put. Cheeks greenish black on posterior portion next occiput. Face well hol- 

 lowed below antennae, tubercle rounded -obtuse but conspicuous. Third antennal 

 joint rather elongate, four or more times as long as second, wide, but little nar- 

 rowed distally, arista concolorous with antennae. Pile of front and face brown- 

 ish yellow. Dorsum of thorax and scutellum opalescent, milky, greenish blue or 

 milky olive, with violet to cupreous metallic reflections, the scutellum more 

 darkly blue, with violet or purplish reflections. The prescutellar row of bristles 

 is weak but distinct. Scutellum with six to eight bristles. Pile of thorax and 

 scutellum yellowish like that of front. Abdomen wholly deep shining bluish 

 green. Legs blackish or brown ; knees, metatarsi and next tarsal joint yellowish. 

 Wings clear, bases and stigmal area pale yellowish, following distal half third 

 costal cell to its extremity; stigma and anterior cross-vein brown. Pile of abdo- 

 men short, even, close, appearing whitish from above but brownish yellow from 

 sides, giving no fasciate appearance to abdomen which is uniformly colored and 

 shining. The width of abdomen is about equal to its length, measuring 4 mm. 

 in both dimensions. The pleurae are rather yellowish brown. Second vein regu- 

 lar. Marginal cell closed and short petiolate. Anterior cross-vein rather near 

 base discal cell. 



This is a most interesting species, occurring as it does at the west- 

 ern base of the Organ Mts., for it belongs to the neotropical group 

 of V. amethystina, as defined by me in Ann. and Mag. of X. H., 

 ser. 6, vol. 20, July, 1897, pp. 25-30, where five similar species 

 taken by me in the State of Vera Cruz, near Jical tepee, on flowers 

 of Cordia sp., are described. It is more nearly allied to opallna and 

 chcetophora than to the others. It differs from them in having the 

 face produced downward into an acute cone, not right-angled coni- 

 cal as in those species; and in the third antennal joint not being 

 narrowed on distal half. 



Toliicella haagii Jaenn. 



A small female specimen, measuring only 11.5 mm., taken Sep- 

 tember 5tli, at La Cueva, Organ Mts., in flower of Datura meteloi- 

 des before sunrise. Other larger specimens were seen on several 

 previous mornings, from daylight to sunrise, in the same flowens, 

 but wei'e not caught owing to their extreme wariness. 



Coiiops aurafiiM n. sp. 



Three males and one female. La Cueva (Riley's Ranch), Organ 

 Mts., about 5300 ft. ; the males August 29th, September 4th and 



TRANS. AM. ENT. SOC, XXVII. (21) FKBRUARY. 1901. 



