;^0 Families and Genera of 



General color more or less black-gray, the le^s j)revailing black, 



the tibiie often red 60 



^V^. The male genitalia very thickly club-like, or at least the sixth 

 and seventh abdominal segments help form the female ovi- 

 duct. Neoitamus 



Male genitalia not club-like, the sixth and seventh segments 

 take no part in the formation of the oviduct. 61 



HI. Male genitalia, when seen from above, more or less acute on the 

 end ; facial gibbosity rather large. . . Tolmerus. 



Male genitalia, when seen from above, more or less obtuse ; fa- 

 cial gibbosity very small. . . . . " Cerdistus 

 62. Abdomen without bristles before the incisures. . . 63 

 Abdomen with bristles before the incisures. . . .68 

 68. Facial gibbosity extraordinarily large, the extremely sharp tip 

 of the proboscis bent somewhat upwards. ° Proagonistes 

 Facial gibbosity of usual size, the proboscis wholly straight, and 

 not sharper than usual. ....... 64 



64. Mystax bristly as usual. ....... 65 



Mystax fine-haired, depressed. . . . ° Antiphrisson 



65. Abdomen fine-haired, depressed. ..... 66 



Abdomen with rather long, scattered vestiture. ^ Pami'Onercs 



66. Bright colored, large species. ...... 67 



Small, ash-gray species '^ Rhadiurgds 



67. Feet of usual length and structure Asilus 



Feet unusually elongated oEccoptopits 



68. First joint of the four anterior tarsi remarkably short. 



O ECHTHISTUS 



First joint, etc., not remarkably shortened. ... 69 



69. Oviduct ( 9 ) club-shaped, thickly pilose below. ° Antipalus 

 Oviduct conical, beset with short spines at the end. Philodiciis 



Leptogasteu Meigen, Illiger's Magaz. 1803. 

 Ceraturgus Wiedemann, Analecta, 12, 1824. 

 DiocTKiA Meigen, Illiger's Magaz. 1803. 

 Ecutiiodopa Loew, Centur. VII, 27, 1866. 

 Plesiomma Mac(}uart, Dipt. Exot. I, 2, 54, 1838. 

 Miorostylum Macquart, Dipt. Exot. I, 2, 26, 1838. 

 OspRioCERUS Loew, Centur. VII, 51, 1866. 

 Abi>autatu8 Loew, Herl. Ent. Z. 1874, 377. 



