out just above the oral margin inaequalis (Loew) 



— Face wholly green or yellow, or marked with black 

 other than along the midfacial line 9 



9. The black markings on the 3rd abdominal segment 

 semielliptical, broadest at the middle of the segment 

 alticqla (James) 



— The blacky marking of the 3rd abdominal segment with 

 a biarcuate posterior margin, as broad or nearly as 

 broad laterally as medially 10 



10. Face in lateral profile extending forward as far as 

 width of the eye; abdominal bands never contiguous 

 tumida (Banks) 



. — Face in lateral profile extending forward much less 

 than width of the eye; abdominal bands often contiguous 

 arcuata (Loew) 



REFERENCES 



3RUES, C. T. 



1928. See Diptera references. 

 CURRAN, C. H. 

 ! 1927. Synopsis of the Canadian Stratiomyidae (Diptera). 



Trans. Roy. Soc. Can. Sec. V, 1927, pp. 191-228. 

 JAMES, M. T. 



1936a. A proposed classification of the Nearctic Stra- 

 tiomyinae (Diptera: Stratiomyidae). Trans. Amer. Ent. 

 Soc, 62:31-36. 

 19366. The Stratiomyidae of Colorado and Utah. Jour. 



Kansas Ent. Soc, 9:33-48. 

 1936c. The genus Odontomyia in America North of Mexico 

 (Diptera, Stratiomyidae). Ann. Ent. Soc. Amer., 29: 

 517-550. 



1942. A review of the Myxosargini (Diptera, Stratiomyi- 

 dae). Pan-Pac Ent., 18:49-60. 



1943. A revision of the Nearctic species of Adoxomyia 

 (Diptera, Stratiomyidae). Proc Ent. Soc. Wash., 

 45:163-171. 



JAMES, M. T., and G. C. STEYSKAL 



1952. A review of the Nearctic Stratiomyini (Diptera, 

 Stratiomyidae). Ann. Ent. Soc. Amer., 45:385-412. 

 JOHANNSEN, O. A. 



1922. Stratiomyiid larvae and puparia of the North East- 

 ern States. Jour. N.Y. Ent. Soc, 30:141-153, 2 pis. 



1935. See Diptera references. 

 LENZ, F. 



1923. Stratiomyidenlarven aus Zuellen. Arch. Naturgesch. 

 Abt. A, 89:39-62. 



vlALLOCH, J. R. 



1917. See Diptera references. 

 ICELANDER, A. L. 



1903. A review of the North American species of Nerno- 

 telus. Psyche, 10:171-183, 1 pi. 



Family RHAGIONIDAE 



The larvae of Atherix are the only known aquatics of 

 die Rhagionidae, or snipe flies. "The eggs of A. 



443 

 Wirth and Stone: Diptera 



varieyata, the only American species, are laid in 

 masses on twigs over streams into which the >oun^ 

 larvae fall immediately after hatching; the female 

 dies, clinging to the egg mass, after deposition. 

 Other females then lay eggs on this mass until a 

 ball of considerable size is formed, composed of egg 

 masses and dead females." (Johannscn, 1935). The 

 larva (fig. 14:46a, 6) was described by Greene (]926). 

 A. variegata Walker 1848, has been recorded from 

 California. 



REFERENCES 



GREENE, C. T. 



1926. Descriptions of larvae and pupae of two-winged 

 flies belonging to the family Leptidae. Proc. U.S. 

 Nat. Mus. 70:1-20. 

 JOHANNSEN, O. A. 



1935. See Diptera references. 

 LEONARD, M. D. 



1930. A revision of the dipterous family Rhagionidae 

 (Leptidae) in the United States. Mem. Amer. Ent. Soc. 

 7:1-181. 



Family TABANIDAE 



The horse- and deer-flies are familiar objects to 

 everyone. The latter are persistent biters of hunters 

 and campers as well as the larger warm-blooded ver- 

 tebrates of the forest. Some species have been incrim- 

 inated as vectors of certain diseases affecting man. 

 Only the females suck blood, and many males are 

 nectar and pollen feeders. It is often difficult to 

 determine the association of the sexes because of 

 the marked dissimilarity between males and females. 



The larvae are all predaceous on softrbodied inver- 

 tebrates, and most of them are aquatic or semiaquatic. 



Brennan (1935) and Stone (1938) reviewed the two 



Fig. 14:46. Rhagionidae. a,b, Atherix variegata Walk., larva, 

 lateral and dorsal views (Johannsen, 1935). 



f 



Fig. 14:47. Tabanidae. a,d,f, Tabanus sp.: a, wing venation; 

 d, antenna; f, frons of female, b, Chrysops surda O.S., abdomen 

 of female; c, Chrysops co/oradens/'s Bigot, wing; e, Chrysops 

 coquilletti Hine, antenna (Middlekauff, 1950). 



