NORTH AMERICAN DIPTERA. 261 



scutellum green, spines yellow; pleurae, green, with irregular black markings; 

 pectus black. Black of the abdomen consisting of a series of broad bands rarely 

 reaching the lateral margin, and having a triangle or square of green or greenish 

 yellow at the posterior angle ; posterior edge of the band on the fifth segment 

 with a deep sinus. 



Fifteen specimens ( S 9 ), " the neck," Philadelphia, June 27 

 (Charles Liebeck) ; An<>lesea, N. J. ( ^ $ ), July 19 ; South Dacota 

 I 9 (Aldrich); Agricultural College, INIichigan (Davis); Newton- 

 ville, Mass. (Henshaw) ; St. Louis, Mo., July 28 (Riley); Mexico? 

 (Bellardi). I am doubtfid whether Bellardi had Say's species. 



Odontoniyia liydroleuoides u. sp. (PI. iv, fig. 10). 



Length 9 7-10 mm. — Front, vertex, occiput and upper half of the face reddish, 

 lower half of the face blackish ; base of the antennte surrounded by black, from 

 which extends the following more or less prominent lines : a narrow line to the 

 ocellar triangle, a wider one over the facial prominenc^e, the oblique lines to the 

 black on the lower part of the face and a narrow transverse line to the lower 

 part of the face; ocellar triangle black, the black extending over the vertical 

 angle. Thorax black, with short yellowish pubescence ; scutellura black, apex 

 and spines brownish (in one specimen yellow), spines very short. Abdomen 

 green, with a wide and quite regular black dorsal stripe; venter green. Legs 

 yellow. Wings hyaline, veins light yellow : discal cell emits two veins and shows 

 an angulation at the origin of the third vein, third longitudinal vein simple. 



Toronto, Canada, July 7 (Wm. Brodie); Agricultural College, 

 Michigan, July 28 (Davis); Illinois (Amer. En't. Soc); Ogden, 

 Utah,"june 20 (collection C. V. Riley, U. S. Nat. Mus.). 



I was inclined at first to consider this an introduced species ( 0. 

 hydroleon Linne, of Europe), but in comparing these with a speci- 

 men from Germany, I hardly felt justified in uniting the two. The 

 European species differs from this in having the face almost wholly 

 reddish, the front and vertex noticeably narrower, the spines of the 

 scutellum^ almost double the size and apical margin more prominent, 

 and the dorsal stripe of the abdomen wider and more irregular. The 

 force of the suggestion that 0. hydroleon has been introduced, seems 

 somewhat lessened when we consider the wide distribution of this 

 species. The male will probably closely resemble that of 0. vin/o 

 or 0. piliinana. 



0<loiitoniyia ainericaua Day. 



Odontomyia ameriania Day. Proc. Acad. Nat. Sci. Phila. 1882, 77. 

 '^ . — Black. Head black. Antenuje reddish brown ; the second joint as long, 

 or longer than the first. Face small, not prominent ; proboscis black. Thorax 

 black and covered with a yellowish white pubescence ; scutellum the same, the 

 apical spines being yellow; halteres green. Abdomen green, with a median 

 black stripe of nearly equal breadth throughout ; venter green, immaculate. 



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



