104 
DIPTERA. 
Exorista, from which it scarcely differs except in the total absence of pilosity from 
the eyes. - 
The Central-American collections before me contain numerous species 
the genus Masicera as thus restricted. 
ll. 
12. 
138. 
14. 
15. 
. Wings partly blackish . . . «. . . a 
. Second and third abdominal segments with discal and mar- 
ginal macrochete (subgenus Ceromasia, Rond.) . 
Second and third abdominal segments with marginal macro- 
chete only. . 2. . 6 ee te et 
. Palpi black . . . 
Palpi rufous or yellowish oe ee ee ee 
. Front ochraceous, the face white . 
Front and face cinereous . . . + «© © © «© © © * *8 
. Palpiblack .. . 
Palpi rufous or yellowish, at least at ‘the tip . 
. Anal segment rufous. 
Anal segment not rufous 
. Small cross-vein on the middle of the discal cell . .. 
Small cross-vein before the middle of the discal cell 
. Frontal band inconspicuous 
Frontal band black and very distinct woe ee 
Head red, with silvery-white reflections ; abdomen with irre- 
gular black reflecting spots ; larger species (9 millim.) . 
Head whitish, not silvery; abdominal segments with black 
hind borders; smaller species (4°5 millim.) 
Thorax with two broad black bands . 
Thorax with four black stripes 
Wings greyish-hyaline . . «. ». » «© - = > 
Scutellum testaceous, at least at the hind margin 
Scutellum grey or black . .. . 
Frontal band nearly as broad as the sides of the front ; frontal 
bristles on each side in a single row . . 
Frontal band much narrower than the sides of the front ; 
frontal bristles on each side in double rows or somewhat 
° 
irregular. 2. 6. 2 6 es 6 we ew se ee 
Anus rufous . ... + + © © © «© © «© @ . 
Anus not rufous . . . 6 »« «© « «© « « » . 
Posterior cross-vein curved ; stripes of the thorax linear . 
Posterior cross-vein straight ; stripes of the thorax broad 
Stripes of the thorax thin, linear, and usually obliterated 
behind the transverse suture . .°. 
Stripes of the thorax distinctly prolonged behind the trans- 
verse suture, usually broad and very conspicuous 
belonging to 
4. 
luctuosa, v. d. Wulp. 
3. 
strigata, v. d. Wulp. 
sodalis, v. d. Wulp. 
5. 
9. 
abdominalis, v. d. Wulp. 
6. 
tantilla, v. d. Wulp. 
7. 
inquinata, v. d. Wulp. 
8. 
impedita, v. d. Wulp. 
pumila, v. d. Wulp. 
10. 
ll. ; 
picta, v. d. Wulp. 
bistrigata, v. d. Wulp. 
12. 
13. 
normula, v. d. Wulp. 
fraudulenta, v. d. Wulp. 
14. 
15. 
piliseta, v. d. Wulp. 
subpilosa, v. d. Wulp. 
16. 
18. 
