NORTH AMERICAN DIPTERA. 267 



Tlie only point iu which these specimens ditfers from Bigot's de- 

 scription is in tlie abdominal markings, " demi-bande subtrigonale 

 fauve," but considering the great variation of its nearest allied spe- 

 cies, especially in the male, which was Bigot's tyj)e ; I can only refer 

 these specimens to this species. 



Odoiiloinyia liioroglypliica Olivier (PI. iv, figs. 4, 5). 

 Odonlomi/ia hierogltjphica Ollv.. Entycl. Meth. viii, 434. 



Length % 10 mm. — Face black. ])ile yellow, facial protuberance prominent; oc- 

 ciput and a tran.sverse facial marking (contracted in the middle) between the oral 

 margin and the facial protuberance but not reaching the eyes, yellow. Autennse 

 brow!iish black ; base of the first and second joints reddish.. Thorax black, with 

 long, thick, yellowish pile; scutellum black; lower edge of the outer margin 

 yellow, spines small, yellow. Abdomen black, pile yellow, much wider than the 

 thorax; second segment with a large lateral triangle; third and fourth with a 

 subtriangiilar marking at the posterior angles, largest on the third ; posterior 

 margin of the fifth and the lateral margins of all except the first segment, yellow ; 

 venter greenish yellow ; fourth segment with a medial, black square, in the centre 

 of which is a yellow spot ; fifth with a narrow anterior margin. Femora black ; 

 distal half of the tibiiB and last two joints of the tarsi, brown ; tips of the femora, 

 basal half of the tibite and tarsi yellow. Wings hyaline, veins light yellow, discal 

 cell emits three veins, third longitudinal vein simple 



Length 9 H mm. — Face, front, vertical angles and occiput, green ; shining, 

 with sparse, yellow pubescence ; a subquadrate black spot surrounds the base of 

 the anteimai ; the lower edge of which has prominent projections at the angles 

 and on the facial prominence, the latter connecting with the edges of the oral 

 margin ; a short, transverse line extends on each side from the frontal orbits about 

 midway between the antennse and vertex, and a line the width of the ocelli across 

 the vertex black. Antennae and i)roboscis black. Thorax black, with short, yel- 

 lowish pubescence: humeri, lateral stripe and scutellum, green ; spines yellow; 

 pleurae green, with a black spot that is connected with the blac-k on the pectus. 

 Abdomen black : first segment with small, green triangles at the posterior angles; 

 second with prominent ones, those on the third about one-half the size of those 

 on the second, and those on the fourth about one-half the size of those on the 

 third ; posterior margin of the fifth, and a narrow lateral margin on all the seg- 

 ments and venter green. Legs black ; tips of the femora, basal half of the tibiae, 

 and the first three joints of the tarsi yellow ; the outer half of the anterior and 

 middle tibiae are brownish black. Wings yellowish hyaline, veins brown, discal 

 cell emits three veins : third longitudinal vein simple. 



Massachusetts, July (Univ. Kans.) ; Virginia (Amer. Ent. Soc. ) ; 

 District of Columbia, May 19; Allegheny, Pa., June 7 (Aldrich) ; 

 Carolina (Loew) ; Morris County, N. J., June 25. 



Oclontomyia similis n. sp. (PL iv, fig. 6). 



Length 9 10 mm.; wing 8 mm. — Face, front and occiput, yellow; shining, 

 with yellow pile; edge of the oral margin black and connected with a large, 

 black, arrow-shaped .spot that surrounds the antennae ; from this extends a frontal 

 line about half way to the ocelli, and from this extends, at right angles, wavy 



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



