76 MAINE AGRrCULTURAL ExPERIMHNT STATION. I912. 



2. Dynaiosonia ftilvida Coquillett. 

 Canad. Ent. XXVII. 201. 1895. 



}>Iale. Length 4.5 mm. to 7 mm. Head dusky yellowish with 

 darker transverse fascia, or wholly brown, antennae subfuscous, 

 4 or 5 basal joints and palpi yellowish. Thorax reddish yellow, 

 hairs yellow, setcC reddish yellow to brown. Abdomen reddish 

 yellow, the 3 posterior segments largely subshining blackish 

 with yellow margins; hypopygium (Fig. 59). Coxre and legs 

 yellow, the tarsi and the tips of the hind femora brownish. 

 Wings grayish hyaline, marked with a large brown central spot, 

 a preapical fascia and a fainter grayish apical margin (Fig. 

 184). Halteres yellow. Capens, Me. ( C.W.J. ), July; Friday 

 Harbor. Washington (J.M.A.), May; Ithaca, N. Y. 



Female. Similar to the male, but the abdomen with less dark 

 coloring, in 2 specimens wholly reddish yellow. Selkirk Mts. 

 (J.C.B.); Friday Harbor, Washington (J.M.A.), May; Ithaca, 

 N. Y., June. 



3. Dynatosonia thoracica Coquillett. 

 Proc. U. S. Nat. Mus. XXIII. 598. 1901. 

 ]\Iale and female. Length 4 to 5 mm. Head black, upper 

 part of face, base of antenuce and the mouth parts yellow, 

 thorax and scutellum black, subopaque ; abdomen dark brown, 

 the first 4 segments partly or wholly reddish yellow; legs yel- 

 low, tarsi brownish, anterior tibiae each bearing about 4 down- 

 wardly directed spires at apex of outer side, the anterior 

 s]iine the longest, nearly half as long as the tibial spur; many o^ 

 the lateral bristles of middle and hind tibia much longer than 

 greatest diameter of the tibiae, those on inner side of the middle 

 tibiae shorter than greatest diameter of the latter; wings grayish 

 hyaline, tinged with yellowish along the costa, cubitus forking 

 about opposite the crossvein. Halteres yellow. "111., N. H." 

 An examination of the type shows that there are 2 ranges ox 

 seta; on each hind tibia. 



4. Dynatosonia placida n. sp. 

 ^lale. Length 5.5 mm. Head fulvous, frontal groove dusky, 

 ocelli 2, face and palpi pale yellow, antennas fuscous, 4 or 5 

 basal joints yellowish, setae on the upper eye margin, brown. 

 Thorax fulvous, mesonotum with 3 indistinct pale brown vittie, 

 setae pale brown ; pleura, scutellum, and metanotum yellow : 



