S. W. Wdliston — North American (Jonopidm. 391 



PHYSOCEPHALA. 



Physocephala Schiner, Wien. Entoniol. Monatschrift, v Band, 

 1861 ; Fauna Austr,, i, 375. 



1. — The brown of the wing fills out the discal cell to beyond the 

 great cross- vein. 2. 



Outer portion of discal cell from near the small cross-vein 

 distinctly lighter or hyaline. 3. 



2. — Cheeks uniformly black ; dust on the humeri indistinct. 



tibialis. 

 Cheeks with a yellow spot in the middle, brown in front and 

 behind; humeri with distinct yellow dust. sagittaria. 



3. — Cheeks uniformly black or brown ; basal joint of antennse very 

 short. 4. 



Cheeks with a yellow spot in the middle ; first joint of ante^inoe 

 about as long as the third. 5. 



4. — Front with deep black transverse and median divaricate stripes ; 

 Dark colored species. furcillata. 



Front with narrow reddish stripes or wholly yellow ; dorsum of 

 thorax with a broad, median, posteriorly abbreviated black 

 stripe. Reddish species. Burgessi. 



5. — Ultimate section of fourth vein but little or not at all lonper 

 than the penultimate. 6. 



Ultimate section nearly twice as long as the penultimate ; dorsum 

 of thorax with a narrow, median black stripe. Reddish 

 species. Texana. 



6. — Facial grooves and frontal stripes black. Dark colored spe- 

 cies, marginata. 

 Facial grooves but little or not at all darkened ; frontal stripes 

 nearly or quite obsolete ; dorsum of thorax with three black 

 stripes, narrowly separated or confluent, the median one more 

 abbreviated behind. affinis. 



tibialis Say, Jour. Acad. Phil, vi, 171 ; Com p. Wr., ii, 363 ( Conops); 



Williston, these Trans., iv, 333 (id.). — Atlantic States. 

 Conops nigricornis Wiedemann, Auss. Zw. Ins., ii, 236, 4 ; Loew, 



Neue Beitr, etc., i, 31. 

 sagittaria Say, Jour. Acad. Phil., iii, 83, 2; Comp. Wr., ii, 73 [Co- 



nop>s) ; Williston, these Trans., iv, 334 (id.). — Penn,, Mass., 



Conn., N. C. 

 Conops genualis Loew, Neue Beitr. etc., i, p. 32 ; Williston, 



these Trans., iv, 335 (translation of the original). 

 furcillata Williston, these Trans., iv, 336 {Conojjs). — N. H., Can. 



? Conops mthlop>s Walker, List, etc., iii, 671. 

 Burgessi Williston, these Trans., iv, 337 {Conops). — Col., Cal. 

 Texana Williston, these Trans., iv, 338 {Conops). — Tex. 

 marginata Say, Journ. Acad. Phil., iii, 82, 1 ; Compl. Wr., ii, 73 



{Conojys) ; Wiedemann, Auss. Zw. Ins., ii, 240, 9 {id.) ; Loew, 



Neue Beitr. etc., i, 34 {id.)\ Williston, these Trans., iv, 338 lid.) 



—Penn., N. H. 

 affinis Williston, these Trans., iv, 339 ((7ono;^s).— Kans., Cal.,Wash, 



Terr. 

 Trans. Conn. Acad., Vol. VI. 49 April 1885. 



