260 BULLETIN 31, UNITED STATES NATIONAL MUSEUM. 



Marginal coll of the wings open, third longitudinal vein ungulated and 

 with a stump of a vein projecting into the first i)osterior cell; anterior 

 cross-vein beyond the middle of the discal cell, oblique. Tegulae large. 

 Type of genus, C. conopsoideus Linn6. 



TABLE OF SPECIES. 



1. — Antennal process of front not more than half as long as the ihst joint of antennae ; 

 third longitudinal vein angulated, bnt scarcely bent into the first posterior 



cell 2 



Antennal process slender, longer than first joint of antenute ; third vein bent 



deeply into lirst posterior cell 3 



2. — Antennal process almost wholly wanting, first joint of antennae very slender, 

 nearly as long as the two following together ; face vertical, not at all ex- 

 cavated in profile; second segment of the abdomen much constricted, third 



and fourth segments each with^two arcuated spots signifera 



Antennal process about one-half as long as first joint of antennae, the latter slender, 



about three-fourths as long as last two together ; abdomen without the side 



spots on third and fourth segments, the second segment less constricted; 



wings similar to preceding ; the general color more ferruginous . Loewii 



3. — Second, third, and fourth segments of abdomen each with two yellow spots, in 



addition to the bands of the hiud margins pictula 



Second, third, and fourth segments without such spots 4 



4. — Second segment of abdomen much shorter than the third .... abbreviata 

 Second segment of abdomen nearly as long as the third tridens 



Ceria Loewii, n. sp. 



Habitat. — Arizona ! 



S. Length, IC""!. Face sulphur yellow; from the antennal pro- 

 tuberance a moderately broad ferruginous stripe, white dusted along 

 the middle, where it is the broadest, runs to the oral margin. Cheeks 

 broadly dark ferruginous. From the base of the antennal process a 

 small, indistinct projection, on each side, is directed outwards and 

 downwards. Antennal process short, but little more than one-half as 

 long as the first joint of the autennsB ; the latter slender, about three- 

 fourths as long as the two following together ; second joint a little 

 shorter than the third, style slender; the color is dark ferruginous. 

 Vertex reddish yellow. Dorsum of thorax brownish black ; red on the 

 sides and on the meso and ptero pleurae ; humeri and scutellum yellow. 

 Abdomen: first segment, reddish brown; second segment, rather slender, 

 somewhat longer than the third, with a spot on each side, nearly con- 

 tiguous, and narrow posterior margin, yellow, elsewhere reddish-brown- 

 ish black ; third and fourth with broader yellow hiud margins. Legs 

 reddish yellow. Wings brown on the anterior j)ortiou ; third longitu- 

 dinal vein slightly angulated and with a stump of a vein ; first posterior 

 cell closed in the border of wing. 



Two specimens (H. K. Morrison). This fine, large species I dedicate 

 to the memory of Dr. Loew, to whom the science of American dipter- 

 ology owes so much. 



