CYRTOMETOPA.—STENOMACRA., 389 
1. Cyrtometopa ferruginea. 
Odontomera ferruginea, Macq. Dipt. Exot. ii. 8, p. 215, t. 29. fig. 6. 
Rufous; scutellum usually with a blackish spot at the sides; wings yellowish, a narrow band near the base, 
a narrow border on the small cross-vein, and an apical spot, brown. 
Length 4-5-6°5 millim. 
Of slender shape and a general rufous coloration. Front broader than the eyes; face deeply excavated ; 
cheeks rather narrow ; occiput swollen. Antenne not reaching the oral margin; third joint three times 
as long as the second, infuscated at the tip; arista pubescent. Proboscis and palpi rufous, the proboscis 
short and thick. Thorax ovate; scutellum small, with two bristles, often with a blackish spot on each 
side. Abdomen attenuated at the base, curved downward; second and following segments sometimes 
with a brown hind border, or the whole abdomen brownish (result of exsiccation ?); on each side of 
the second segment a long bristle; male genitalia slightly prominent; ovipositor of the female broad, 
flattened, truncated. Legs rufous; sometimes the tibie and the front tarsi brownish; the middle and 
hind tarsi pale yellow; base of the hind tibic often a little infuscated; the legs are very slender, the 
middle and hind femora elongate, all the femora inferiorly spinose, the middle and hind tibiae with a spur. 
Halteres yellow. Wings yellowish-hyaline ; a narrow brown band near the base, extending from the 
end of the mediastinal cell to the end of the second basal cell; the apical spot does not reach the end of 
the second vein ; the small cross-vein narrowly bordered with brown; in a few specimens the posterior 
cross-vein has some indication of a similar border. The auxiliary vein and the first vein terminate close 
together in the costa, at a little before the basal third of the length of the wing and much before the 
small cross-vein ; third and fourth veins slightly convergent towards the tip; small cross-vein a little 
beyond the middle of the discal cell; the second and third basal cells truncated. 
Hab. Mexico, Cuernavaca in Morelos, Medellin and Atoyac in Vera Cruz 
(Hl. H. Smith). 
Several specimens of both sexes. 
2. Cyrtometopa cinctella, sp.n. (Tab. X. figg. 20; 204, head in profile.) 
Rufous; scutellum black ; hind femora with a blackish ring ; pattern of the Wings as in C. ferruginea. 
Length 5-7 millim. 
Closely allied to C. ferruginea and agreeing with it in most respects, but generally of somewhat larger size. 
The scutellum, however, is wholly black, and the hind femora have a blackish ring just before the middle. 
In most of the specimens the dorsal surface of the abdomen is more or less chestnut-brown or has 
brownish hind borders to the segments; in one of them (a large female) nearly the whole abdomen, 
including the ovipositor, is shining black. 
Hab. Mexico, San Lorenzo, near Cordova (MM. Trujillo), Teapa in Tabasco 
(H. H. Smith). 
Several specimens of both sexes. 
STENOMACRA. 
Stenomacra, Low, Monogr. Dipt. N. Amer. iii. p. 180 (1873). 
1. Stenomacra guerini. (Tab. X. fig. 21, wing.) 
Sepsis gerinii (sic), Bigot, in Ramon de la Sagra’s Hist. fis. polit. y nat. de Cuba, Ins. p. 346, t. 20. 
figg. 9, 9a-c’. 
Stenomacra guerini, Low, Monogr. Dipt. N. Amer. iii. p. 180, t. 9. fig. 257%. 
