ART. 10 NOETH AMERICAN TACHINID FLIES WEBBER 9 



nae). Front pulvilli nearly equal in length to the last two tarsal 

 joints. Hind cross vein sinuate, distance from its end to small 

 cross vein over twice its length; distance from end of hind cross 

 vein to angle of fourth vein a little more than its length. Apical 

 cell slightly open. 



Face and front with slight yellowish cast which is by no means 

 golden ; facial depression cinereous, rather deep and about six times 

 the width of either parafacial at narrowest part, the latter at this 

 point less than the width of the third antennal joint. Vibrissal 

 angles weak, the vibrissae a little above oral margin. Palpi very 

 light yellow, thickly beset with short black spines. Antennae wholly 

 black, excepting the extreme bases of second and third segments, 

 which are faintly bordered with red. Arista thickened on basal 

 third and then gradually tapering to apex. Facial ridges bristly 

 three-fourths way to base of antennae. Frontals, eight in number, 

 reaching from a point opposite the last bristles of the facial ridges 

 to a point one-half way between base of antennae and vertex, the 

 uppermost pair considerably weaker than the others. Two large 

 reclinate bristles of equal strength continue along the line (a little 

 outside) of the frontal rows. Inner vertical bristle strong, outer one 

 much weaker and hardly differentiated from the immediate occipital 

 hairs. Front vitta brownish, about one-third the width of front, 

 sides of latter sparsely beset with weak bristles and hairs, none of 

 which is equal in strength to the weakest frontal bristles. Occiput 

 but slightly swollen below, at its greatest width scarcely equal to 

 breadth of third antennal joint. 



Thorax brownish black, moderately pollinose with the usual four 

 vittae. Thoracic chaetotaxy : Before the suture, acrostichal 3 ; dorso- 

 central 3 ; posthumeral 3 ; humeral 3 ; presutural 2 ; behind the suture, 

 acrostichal 3; dorsocentral 4; intraalar 3; supraalar 3; postalar 1. 

 Scutellum brownish black, gray pollinose at base, the posterior third 

 and entire border yellow as palpi and bearing three pairs of marginal 

 bristles besides the cruciate apical pair, intermediate pair much 

 weaker than the others; disk thickly beset with small hairs and 

 bearing a pair of weak bristles. 



Sternopleura with three strong and one weak bristles. Ptero- 

 pleural bristle small, about the size of the weakest sternopleural 

 bristle. Legs black. Mid tibiae with one long bristle on the outer 

 front side near middle, above it a smaller one about one-half its size 

 but much stronger than the adjacent ones; two hind bristles, the 

 uppermost a little above middle ; and also a strong inner bristle just 

 below middle. The tibial spurs are as usual, one on outside, one in 

 front, two on inner side, and a smaller one behind. Hind tibiae 

 evenly ciliate with one longer bristle a little way below the middle. 

 2660—30 -2 



