BY HOWLAXD K. TURNER. 211 



a. ^ . Epipygiuni narrow at the apex. 



$ . Head quadrilateral, flat. Second abdominal segment 



without striaj. 

 a'^. $ . Clypeus with a raised A-shaped carina. Front with 

 a transverse carina. 

 % . With a sulca on each side of the head from the eye 

 to the occiput. Maxillary palpi six-jointed. 

 Mandibles usually bidentate. Genus 2. Rhagigastei: 



/)■-. ^ . The frontal carina absent or very faint. 



5 . Without lateral sulcre on the head. Mandibles 

 simple. Maxillary palpi four-jointed. Tarsal 

 ungues simple. Genus 3. Rhytidogastek. 



i). ^. Epipygium truncate or broadly rounded at the apex. 

 $ . Head small, slightly convex, rounded posteriorly. 

 Maxillary palpi six-jointed, mandibles falcate; 

 second abdominal segment transversely striated. 

 Pygidium vertically truncate, striated. Genus 4. Enteles. 



C. ^. Hypopygium normal, unarmed. 



$ . Head quadrilateral, flat, maxillary palpi four-jointed. 



Abdomen cylindrical. 

 a. (^. Three apical joints of maxillary palpi elongate. An- 

 tennte rather long, 

 a'-. (J. Third cubital cell not narrow along the radial 



nervure. Genus 5. Aelurus. 



h^. ^. Third cubital cell very narrow along the radial 



nervure. Subgenus Lepteironc. 



A. J . Three apical joints of maxillary palpi moderately 



lengthened. Antenna short. Subgenus Eirone, 



D. (^ . Abdomen short, subpetiolate. Hypopygium armed. Three 



apical joints of the maxillary palpi elongate. 

 $ . Without striae on the second abdominal segment, 

 a. $ . Hypopygium tridentate. Labium and behind palpi 

 smooth. 

 $ . Head quadrilateral, flat, very broad. Maxillary palpi 



six-jointed. Genus 6. Ariphkox. 



h. $ . Hypopygium variable. Head concave beneath, the 

 sides with a long curled beard. Labium and palpi 

 with long hairs at the apex. 

 2 . Strongly rugose or punctured. Head slightly convex, 

 rounded posteriorly; maxillary palpi rudimentary, 

 Pygidium simple. Genus 7. Tachyxomyia. 



