AMERICAN DIPTERA. 



343 



third, and the costa enlarged from there to the tip of the third vein. Fourth and 

 fifth veins nearly straight at first, then broadly diverging, then coming together 

 a little, ending equidistant from the apex of the wing; seventh vein indistinct. 

 Middle tibiae above near base with two seta', the others with one very small one, 

 which is sometimes imperceptible in the hind tibiae, Dorsum of thorax with one 

 pair of dorsocentral and four marginal scutellar bristles. 

 Length 2 mm., of wing 2.2 mm. 



The specimens described by Loew were from the district oi Co- 

 lumbia. I have sec ilv the type specimen which is in the Loew 



collection at Cambridge. The species can easily be recognized from 

 the description. . 



The specimen referred to by Loew as " var. (?) vena simplici" is 

 evidently abnormal, for in every other respect it resembles the type 

 of microcephtila exactly. It cannot be a species of Hypocera, al- 

 though the simple vein would place it there. It lacks the stout legs 

 and peculiar habitus of the members of that genus. This is the 

 only case out of many hundred specimens which I have examined 

 in which there is any such irregularity in the venation. 



Pliora Stpiuipes Coq. (Figs. 5 and 6.) 

 Coquillett, Canadian Entomologist, xxvii. 105. 

 Black, subshining; the palpi, halteres, front and middle tibiaj with a large 

 portion of their femora, also the knees of the bind legs, yellowish ; all frontal 

 setae pointing upward. Front tibiae each bearing three setae on the outer side of 

 the basal three-fourtbs; middle tibiae each bearing three setae in a curved row on 

 the outer side of the basal half; hind tibiae each with seven setae in an irregular 

 row extending nearly the entire length of the outer side. Wings hyaline, costal 

 vein extending three-fourths the length of the wing, ciliate with rather short 

 bristles; second heavy vein forked near its apex, tip of first heavy vein slightly 

 beyond the middle between the humeral cross-vein and the apex of the second 

 vein ; fourth vein curved near its base, then nearly straight, the cell in front of 

 it scarcely wider than the narrowest part of the cell behind it, seventh vein 

 distinct. 



Length 4 mm. 



Hartford, Conn. The original type is a specimen taken by Mr. 

 S. N. Dunning on April 30, 1893. 



Besides the points noted in the original description, it may be 

 noted that there is a single pair of dorsocentral macrochsetse and 

 four marginal scutellar ones ; the wing veins are light brown ; the 

 costal cilia extremely short and delicate, and the third vein is finely 

 bristly. 



Singularly enough this is the commonest species at Moscow, Idaho. 

 I have from this place forty-six specimens, and Professor Aldrich 



TRANS. AM. ENT. SOC. XXIX. OCTOBER. 1903 



