NORTH AMERICAN DIPTKRA. 
357 
enlarged in front, and the one with the short claws seems to have the 
front slightly narrower. The claws of the other are very elongate. 
1 have a very much smaller S received from Mr. Robertson with 
the above, which is only 4.5 mm. long. It has the claws and pul- 
villi elongated and very closely resembles the larger S , which is 
6.5 mm long. I hesitate to describe it from one specimen, as it seems 
to differ only in its very much smaller size and darker abdomen. 
The abdomen is but slightly reddish on sides of second segment, rest 
blackish, silvery pollinose. The arista, however, is not so distinctly 
jointed. It differs from the following two species in its brassy or 
golden front, and long flavous third antennal joint. In case it is 
recognized from this description and found to be distinct, it may be 
called M. simills. 
The only differences between the above described Miltogrammas 
and Schiller’s generic description are that the arista is quite distinctly 
3-jointed, and the third antennal joint is about twice the length of 
the second. 
,^Iiltoj;raiiima argentif roiis a. sp. 'J, . — Differs from M. flavicornis a,s 
follows: Smaller, without red ou abdomen. Front silvery, iucludiug vitta, sides 
darker iu some lights; only three orbital bristles; frontal bristles not so nu- 
merous or closely set, rather sparse; anteunse entirely dull blackish, except 
apical rim of second joint, which is light yellowish, third joint scarcely longer 
than the second ; arista black, thickened only at base, bulbous, indistinctly 
jointed; sides of face finely hairy ; facial depression narrow, scarcely any bris- 
tles on facial ridges above the vibrissse ; palpi blackish or dark brown ; apical 
scutellar pair of macrochsetse sometimes not, but usually decussate. Abdomen 
blackish or dark brown, light cinereous pollinose, no distinct median vitta ; first 
segment with a weak lateral macrochgeta on the margin ; second with a lateral 
marginal one and a median marginal pair; third segment with eight marginal, 
and anal segment with six marginal, as in the above species. Claws and pulvilli 
elongate. Tr«(f/s smaller ; halteres flavous. Length 4 — 5.5 mm.; of wing 3.5 — 
4.5 mm. 
Described from four % specimens received from Mr. Charles 
Robertson, Carlinville, 111. One of these specimens is much larger 
(5.5 mm.) than the three others (4-4.5 mm.), and also differs in hav- 
ing a median macrochteta (its mate probably lost) on margin of first 
abdominal segment. The sides of the face are only very slightly hairy. 
It does not otherwise differ appreciably. 
Mlltogramma trilineata v. d. Wulp, Biol. C.-A. Dipt, ii, 89. One 
specimen from S. Illinois (Robertson) I believe should be referred 
to this species. It much resembles, but is larger than M. argentifrom 
Towns. 
