NORTH AMERICAN DIPTERA. 265 



red. Abdomen black, with yellow transverse markings at the lateral posterior 

 margins of the second, third and fourth segments less prominent on the fourth ; 

 the markings on the second and third gradually enlarge toward the inner end ; 

 posterior margin of the fifth and lateral margins of all the segments yellow ; 

 venter yellow. Legs totally reddish yellow. Wings hyaline, veins yellow, discal 

 cell emits two veins. 



Described from a type specimen, tlie venter of which is discolored. 

 In tlie twenty specimens before me the venter (unless discolored) is 

 of a uniform greenish yellow ; the abdominal markings vary con- 

 siderably, being sometimes of a uniform width. The color markings 

 on the front and vertex were apparently disregarded in the original 

 description. 



% ■ — The yellow pile of the thorax is longer, the apical margin of the scutellura 

 slightly narrower and the abdominal marking more prominent, and sometimes 

 of a subtriangular form on the second segment. 



In the specimens before me I see no trace of black on the tip of 

 the femora as originally described. 



Denver, Col. (Beales); West Point, Neb., May; Brookings, S. 

 D., June 11 (Aldrich); Agricultural College, Michigan (Davis); 

 Brookline, Mass., May 27, June 12 ; and White Mountains, N. H. 

 (Henshaw); Maine; Canada (Mus. Comp. Zool.) ; Arizona (Wil- 

 liston) ; California (Baron) ; Algonquin, III, June -4 (Dr. W. A. 

 Nason). 



The specimens from the Central States are somewhat smaller (8 

 mm.). In the Museum of Comparative Zoology, in Loew's hand 

 writing, is a MS. name for this species ( Odontomyia latipes). This 

 species may readily be distinguished from 0. intermedia Wied. by 

 its uniform reddi.sh yellow legs. Mr. Snow has informed me, and it 

 has been verified by Mr. Henshaw, by whom they were collected, 

 that the habitat New York, for the types, should be Massachusetts. 

 Day took the label " Brook." for Brooklyn, N. Y., instead of Bi-ook- 

 line, Mass. 



Odoiitoinyia interrupta Olivier (PI. iv, fig.s. 29, 30). 



Odoufomijia hderrnpta Oliv., Encycl. Meth. viii. 433, 8. 



Odontomyia intermedia Wied., Auss. Zw. ii. 64, 5. 



Sfratiomys intermedia Walker, List, etc., v, 38. 

 Length '^9 8 mm. % . — Face black, with whitish pile, thickest on the sides; 

 ocellar triangle, antennse and proboscis black. Thorax black, with whitish pile ; 

 scutellum black, apex brown, spines yellow. Abdomen black, the latral posterior 

 margin of the second, third and fourth segments light yellow, or greenish yellow, 

 thus three bands are seen broadly interrupted in the middle; this intermediate 

 space being about one-third the total width of the abdomen ; fifth with a narrow 



TRANS. AM. ENT. SOC. XXII. (34) JULY, 1895. 



