DIPTERA. A449 
Hab. Mexico!, Xucumanatlan and Omilteme in Guerrero 7000 to 8000 feet (Hf, H. 
Smith). 
Ten specimens. [Mr. Townsend (Canat. Ent. 1893, p. 166) notes that this species 
is allied to his H. punctigera.| 
Notse.—Bigot has described (Bull. Soc. Ent. Fr. 1885, p. clxxiii) a Mexican fly 
under the name of Dimorphomyta calliphorides. He refers it somewhat doubtfully to 
the Phasine, but the real affinities of the genus are very uncertain. 
GYMNOSOMINE (p. 4). 
No species of this group was known to me from Central America when the early 
part of this work was published, though the two North-American genera, Gymnosoma 
and Cistogaster, were noticed on p. 4. 
CISTOGASTER. 
Cistogaster, Latreille, Régne Anim. v. p. 511 (1829). 
Of this genus (which differs from Gymnosoma in having shorter antenne), the 
collections subsequently received from Mexico contain several species, which may be 
distinguished in the following manner :— 
1, Antenne and frontal band rufous or testaceous . . . . . . . ruficornis, v.d. Wulp. 
Antenne and frontal band black (in some species the antennz partly 
black, partly rufous) . . 2. 1. 2. 1 ew ee we eee 
2. Thorax black, the shoulders only grey . . . . . . . . « « melanosoma, v. d. Wulp. 
Thorax grey with black markings or brownish-ochraceous. . . . 3. 
8. Petiole of the apical cell very short . . . . . . . 2 1. 4 
' Petiole of the apical cell of the usual length . . . ..... 5. 
4, Abdomen grey, with black markings: smaller species (length 
35 millim.) ...... . . - 5 2 6 6 « « subpetiolata, v. d. Wulp. 
Abdomen yellowish-rufous, with brown ) markings larger species 
(length 6millim.) . ... . - « propingua, v. d. Wulp. 
5. Abdomen anteriorly black, posteriorly. grey with black markings. - griseonigra, v. d. Wulp. 
Abdomen rufous, with more or less conspicuous dark markings . . 6. 
6. The dark markings of the abdomen obsolete . . . . . «. . . ferruginosa, v. d. Wulp. 
The dark markings of the abdomen distinct . . . 7. 
7”, Abdomen with a black dorsal band: larger species (length 55 5 millim, ) hirticollis, v. d. Wulp. 
Abdomen with regularly-arranged black spots: smaller species 
(length 4 millim.) . 2 2. 2 6. ee ee ee ew ew we . wariegata, v. d. Wulp. 
BIOL. CENTR.-AMER., Dipt., Vol. II., May 1903. 3m 
