162 thomas say foundation 



Group E. 

 Four postsutural dorsocentrals ; hind tibiiE vil- 

 lous; hypopygium entirely black. 



Table of Species. — Males. 



1. Front about as wide as one eye; middle tibia? 



with long, dense villosity on distal half of 

 inner side; very robust species (Atlantic sea- 

 coast from Massachusetts to Texas) 



No. 75. johnsoni n. sp. 

 Front much narrower than one eye ; middle tibicU 

 not conspicuously villous 2. 



2. Forceps large and long, deeply grooved on the 



back, the base with long, dense black hair 

 Europe and Massachusetts) 



No. 76. uliginosa Kramer. 

 Forceps not as described 3. 



3. Anterior clampers large, thick, with grooved back 



(Massachusetts, Ontario, Washington) 

 No. 77. aldrichi Park. 

 Anterior clasper not grooved on back 4. 



4. Penis hooded and with a hump on the back, no 



processes visible (Massachusetts, New 

 York) No. 78. houghi n. sp. 



Penis globose with several characteristic slender 

 processes at apex (Europe, Massachusetts, 

 Idaho) 



No. 79. tuherosa var. liarpaw Pand. 



No. 75. Sarcophag-a johnsoni n. sp. 



Male. Front .317 of the head (average of five, 

 — .306, .309, .318, .320, .333), strongly protuberant, 

 as is also the oral margin; eyes rather small so that 

 the parafacials and bucca are considerably wider than 

 usual, the latter as high as the eye ; front and face sil- 

 very white; parafacials with several rows of small 

 hairs, none bristle-like; vibrissa? slightly approx- 

 imated, a little above the oral margin ; antenna? black, 

 reddish at base of third joint, the latter hardly twice 

 the length of the second, reaching fully three-fourths 

 of the way to the vibrissa?; arista short-plumose a lit- 



