NORTH AMERICAN DIPTERA. 271 



pleurae green, pectus black ; scutellum green, spines yellow, very sLort, halteres 

 green. Abdomen short, depressed, subquadrate, posterior subtruncate ; grfen 

 with black markings; first segment immaculate, marking on the second trian- 

 gular, anterior and posterior dilated, near the side curved ; third, fourth and fifth 

 broadly marked, anterior dilated, posterior attenuated, marking along the whole 

 anterior margin of the segments, except on the fifth ; posterior margin not con- 

 tiguous; venter green. Femora black; extreme tip of the femora, tibia; and 

 tarsi yellow ; extremity of the tarsi brown. Wings hyaline, anterior margin 

 yellowish. Length 7 mm. ; wing 14 nnn. 

 Cuantla, Mexico (Saussure), Bellardi. 



Length % 9 ram. —Face black, with whitish pile; facial tubercle very promi- 

 nent, obtuse, shining; occiput and inferior orbits obscurely yellow, vertical tri- 

 angle and a line extending over the vertical angle black ; eyes covered with a 

 long whitish pile. Antennae dark brown. Thorax black, with long, dense, yel- 

 lowish pile ; posterior angle yellowish ; scutellum black, sides narrowly margined 

 with yellow, and with yellowish pile. Abdomen with a wide, irregular, dorsal 

 stripe of black, leaving the following yellowish markings ; a prominent lateral 

 triangle on the second, third and fourth segments (those on the second and third 

 contiguous, while those on the fourth confined to the posterior angles) and a nar- 

 row lateral and posterior margin on the fifth : venter green. Femora black ; tip 

 of the femora, tibije and tarsi, yellow ; the two terminal joints of the tarsi brown . 

 Wings hyaline, veins yellow, discal emits three veins, third longitudinal vein 

 branched. 



Texas S (Amer. Ent. Soc.j Waco, Texas ? (coll. C. V. Riley), 

 IT. S. Nat. Museuiu. 



Bellardi described only the 9 : with which the specimen I have 

 examined agree so well, that I think there is no donbt of its deter- 

 mination. 



Odontoinyia incxicana n. sp. 



Length '?> 9 6 mm. % . — Face black, shining, with sparse, whitish pile ; oral 

 margins yellov*'. Antennse yellow, third joint brownish. Thorax and scutellum 

 black, with whitish pile; spines yellow. Abdomen greenish white, with an ir- 

 regular black dorsal stripe, consisting of a wide spot on the first, a narrow trian- 

 gular marking on the second and third, a roundish mark on the fourth, and a 

 small spot at the anterior margin of the fifth ; venter greenish white. Legs yel- 

 low; femora, except the tip and terminal joint, brownish. Wings hyaline, veins 

 light yellow, discal cell emits three veins. 



9 . — Face, front, vertex and occiput, greenish yellow ; a transverse line on the 

 vertex, an interrupted line on the front, a line or spot on each side of the an- 

 tennffi, not reaching the orbits, a spot on each side of the facial prominence and 

 mouth, black. Thorax black: pleurae and a lateral stripe green, lateral stripe 

 tapering anteriorly ; scutellum green. Abdomen greenish, dorsal stripe inter- 

 rupted, consisting of a small spot on the first, a small spot at the base of the 

 second and third, a larger spot reaching both margins on the fourth, and a small 

 spot at the base of the fifth segment. 



Tehuantepec, Mexico (collection C. V. Riley, U. S. Nat. Museum). 



TRANS. AM. ENT. SOC. XXII. JULY, 1895. 



