NORTH AMERKJAN DIPTERA. • 257 



Ocloiitomyia Tallax n. sp. 



Leiijitli S mm. 9- — Face, front and occiput greenish yellow; shining, with 

 sparse whitish pile ; vertex, an irregular transverse band on the front extending 

 downward in the centre and connecting with the subquadrate marking surround- 

 ing the antennai, and a siiot on each side of the oral margin black. Antenna; 

 wholly black. Thorax black ; tomentum yellow ; lateral stripe and iileurse 

 greenish; lateral stripe sometimes slightly interrupted at the suture; scutellum 

 entirely yellow, without spines. Abdomen black, second segment with triangular 

 markings; third and foui'th with subtriangular markings at the posterior angles, 

 and the posterior margin of the fifth greenish yellow; venter greenish yellow. 

 Femora and the outer half of the tibiae black ; all except the first joint of the 

 tarsi brownish black ; tip of the femora, basal half of the tibise and first joint of 

 the tarsi reddish. Wings hyaline, veins yellow, third longitudinal vein branched, 

 discal cell emits three veins. 



Four specimens, southern Georgia (Morrison), U. S. Nat. Mus. 



Odontoniyia iiigrirostris Loew (PI. iii, figs. 36, 37). 



Odonfoinyia niyrirostris Loew, Centur. vi, 19; Day, Proc. Acad. Nat. Sci. 



Phila. 1882, 83. 

 ? Exchostnma caloceps Bigot, Ann. Soc. Ent. France. 1879, 217. 



Length 'J, J 12 mm. % . — Face, vertical and frontal triangles black, shining; 

 face with long, whitish pile; epistoma, cheeks and inferior orbits yellowish ; ocelli 

 yellow. Antennse black; proboscis long, black. Thorax and pleurae black with 

 long yellowish pile ; scutellum black, with a wide yellow margin ; without spines. 

 Abdomen black, marked with yellow ; a small marking at the posterior angle of 

 the first segment, which, with the large lateral marking on the second, forms a 

 triangle; those on the third and fourth consisting of an irregular transverse 

 mark at the lateral posterior margin, fifth with a narrow posterior margin ; venter 

 yellow. Legs black, tips of the coxae, base and tip of the femora, basal half of 

 the tibiae and first joint of the tarsi, yellow. Wings hyaline, veins yellow ; discal 

 cell emits three veins, third longitudinal vein branched. 



5 . — Face, front and occiput yellow ; shining, pubescence yellow, face with a 

 large heart-shaped spot, and the vertex black, the black extending along the 

 frontal orbits about half way down the front, leaving a middle- line of yellow, 

 which is contracted in the middle and forked at the top, but not quite reaching 

 the ocellar triangle ; in one specimen the black extends entirely across the upper 

 portion- of the front leaving only two small spots below the ocelli ; a black line 

 extends from the vertex over the vertical angle. Thorax black, pilose on the 

 sides and pleurae, humeri small, spot at the suture, posterior angle and pleurae 

 yellow, spot at the suture sometimes obsolete ; pectus black, two small black dots 

 on the pleurae, one below the humeri and the other below the base of the wing ; 

 scutellum yellow, base (in the centre) black ; marking on the first and second 

 segments more prominent than in the male ; that on the first much wider than 

 the anterior edge of the second, posterior edge attenuated along the posterior 

 margin ; inner margin curved and forming, with the marking on the first seg- 

 ment, a half circle; in other resi)ects'it resembles the male in color. 



Constantiiie, Mich. (x^Lldrich) ; Denver, Co], (E, V. Beales) ; 

 Mantua Park, Col. (F. H. Snow, Univ. Kans.) ; Custer, S. D. ; Big 

 Horn Mountains, Wyoming (Univ. Neb.). 



TRANS. AM. ENT. SOC. XXII. (33) JULY, 1895. 



