66 Orthorihapha brachycera. 



of hypopygium broad, produced downwards, more 



or less triangular 35. 



— Epistoma not pubescent; posterior ventral lobes of 

 hypopygium of another shape 36. 



35. Squamulæ with a yellow fringe; front tibiæ with- 



out any long, thin hair at the tip 33. nuhiliis. 



— Squamulæ with a black fringe; front tibiæ with a 



long, thin hair at the tip 34. latilhnhatus. 



36. Front tibiæ with a long, thin hair at the tip 37. 



— Front tibiæ without any long, thin hair at the tip . . . 38. 



37. Epistoma silver-white; coxæ all yellow 35. linearts. 



— Epistoma yellow; posterior coxæ grey 36. notabilis. 



38. Wings with a blackish blotch at the anterior margin 



on the apical half 39. sabinus. 



■ — Wings without any blackish blotch 39. 



39. Hind metatarsi with only one bristle above 40. agilis. 



— Hind metatarsi with more than one bristle above .... 40. 



40. Basal joint of antennæ only yellowish below; wings 



with a small costal swelling 41. 



— Basal joint of antennæ quite yellow and second 

 joint more or less yellow; epistoma pale yellow; 



wings without costal swelhng 41 . simplex. 



41. Epistoma silver-white 37. caligatus. 



— Epistoma ochraceous 38. lineatocornis. 



42. Last joint of front tarsi dilated; femora pale fringed 42. hrevipennis. 



— Last joint of front tarsi normal; femora not pale 

 fringed 43. 



43. Posterior femora with three or more preapical bristles 43. ungulatus. 



— Posterior femora with only one preapical bristle 44. 



44. Hind femora black fringed 44. longitarsis. 



— Hind femora not fringed 45. rupestris. 



Females. 



1. Femora black 2. 



— Femora pale 15. 



2. Lower postocular bristles black 3. 



— Lower postocular bristles pale 11. 



3. Tibiæ black (middle tibiæ in Stenhammari with a 



pale ring) 4. 



— Anterior tibiæ yellow or ferruginous 9. 



4. Wings darkened on outer half; hind metatarsi with 



many bristles 1 . atratus. 



— Wings not darkened on outer half; hind metatarsi 

 moderately bristly 5. 



5. Front tarsi ferruginous or pale brownish; posterior 

 femora pale-haired below at the base 6. 



— Front tarsi black; posterior femora not pale-haired 

 below at the base 7. 



