NORTH AMERICAN DIPTERA. 251 



19. — Abdomeu black, with transverse niarkinjr, a lateral posterior angle. 



Abdomen black, with a wide, continuous, lateral margin, third antennal 



joint tapering to a fine point inicrostonia Loew. 



20. — Femora black; abdominal markings on the % usually not triangular. . . .21. 



Femora yellow ; abdominal markings on the % usually triangular. 



pubescens Day. 

 21. -Front and vertex marked with yellow iiitorniodia Wicd. 



Front and vertex wholly black lioodiana Bigot. 



22. — First and second joints of the antennse black 23. 



First and second joints of the antennae red 24. 



23. — Front and vertex wide, lateral thoracic stripe continuous. 



Iiieroglypliica Oliv. 



Front and vertex narrow lateral thoracic stripe only jiosteriorly of the suture. 



siiuilis n. sp. 

 24. — Eyes pubescent ; scutellum of the 9 yellow 25. 



Eyes glabrous ; scutellum black, with yellow margin- .occipitalis n. sp. 

 25. — Abdomen ( % ) broad, with narrow markings pilose 26. 



Abdomen ( % ) narrow, with wide marking, pubescent- . flavicoriiis Oliv. 

 26. — Antennffi long ; first and second joints yellow, third black. -Obsctira Oliv. 



Antennas short; reddish or dark brown throughout viritlis Bell. 



Odoutoinyia biuotata Loew (PI. iii. figs. 29, 30, 31, 32). 



OdonUtmyia megacephala Loew, Centur. vi, 20 (non 0. megaccphala Oliv.). 



Odontomyia binotata Loew Centur. vi, 22; Day, Proc. Acad. Nat. Sci. Phila. 

 1882, 81. 



Odontomyia bicolor Day, Proc. Acad. Nat. Sci. Phila. 1882, 78. 

 Length % 9 11-14 mm. "J, . — Face, occiput and vertical angle green : vertical 

 triangle black, ocelli yellowish, frontal triangle small, brownish ; face with thin 

 whitish pile, oral margins yellowish. Autennse reddish ; third joint dark brown, 

 tip black, first and second joints subequal ; palpi and proboscis yellow, end of 

 the proboscis black. Thorax black with yellowish pile, long and dense on the 

 sides: the green markings show the following variation : humeri and posterior 

 angles green ; marking at the posterior angle extends laterally to the suture ; 

 lateral stripe continuous from the humeri to the posterior angle, usually with 

 two spots on the disc of the thorax ; pleurge green, pectus blacikish ; scutellum, basal 

 half black, apical half green, sometimes totally greenish yellow; spines yellow, 

 tips lilack. Abdomen green, with an irregular black dorsal stripe, reaching the 

 posterior margin of the fifth segment and more or less contracted on the second 

 and third segments, a small black spot is usually present at the anterior angle of 

 the fourth segment; venter green. Legs reddish; basal half of the femora and 

 tibiae yellow, outer half of the femora, tibiae and first joint of the tarsi reddish ; 

 tip of the tibiae (especially the anterior and middle) and tip of the first and re- 

 maining joints of the tarsi brown, to brownish black. Wings hyaline, veins yel- 

 low, third longitudinal vein branched ; discal cell emit three strong veins. 



9 . — Face, front, occiput and vertical angle green ; vertex, a wide, transverse 

 line on the front midway between the antennae and ocelli, and narrow lines at 

 the vertical angle separating the green of the vertical from that of the occiput, 

 black ; in some specimens this latter character is wanting, and the vertical and 

 frontal lines are narrowly connected by two longitudinal lines, thus forming three 

 green spots on the front; in one specimen from Utah the frontal markings are 



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



