TACHINID^E. 



361 



been recorded. About seventy species are known to be 

 parasitic upon Hymenoptera, less than forty upon Cole- 

 optera, a score upon Orthoptera, five upon Hemiptera, 

 and as man}'- upon other Diptera. 



The figures of the first plate (1-17) were kindly made 

 by Professor Aldrich. The remainder (18-114), by my- 

 self, have been drawn as carefully as possible. Not 

 being a specialist in this family, it was not always possi- 

 ble to be quite certain of the characters. Professor 

 Townsend has, however, with great kindness examined 

 the figures carefully, and has criticised them in an ap- 

 pendix to this family (p. 378), which should be consulted 

 by the student. 



TABLE OF GENERA. 



BY PROF. C. F. ADAMS. 



1. Apical cell (first posterior) ending at or close to the extreme wing 



tip. ........... 2 



Apical cell ending some distance before the extreme tip. . 76 



2. Abdomen without macrochaetae. ...... 3 



Abdomen with macrochaetae. . . . . . . .11 



3. Sides of face bare. ......... 5 



Sides of face with bristly hairs. ...... 4 



4. Third and fourth veins nearly equally convergent. Gymnophania 

 Fourth vein more convergent than the third (18, 19). Acaulona 



5. Hind tibiae outwardly ciliated with a row of erect bristles. . 6 

 Hind tibiae not ciliated. ...... .7 



6. Apical cell open. ...... Homogenia. 



Apical cell closed. . . . . . Trichopoda. 



7. Abdomen subspherical, the upper side very convex. . . 8 

 Abdomen without such convexity. ..... 10 



8. Antennae not reaching the lower third of the face. . . 9 

 Antennae reaching at least the lowest fifth of the face. 



Gymnosoma. 



9. Abdomen with five visible segments (18, 19). Acaulona. 

 Abdomen with only four visible segments, or the fifth very short 



(1O) Cistogaster. 



10. vSides of the front hairy except a narrow space along each eye (2O) 



Alophora. 



Sides of front bare except two or three rows of hairs along each 

 side of the frontal vitta (21). . . . Phorantha. 



11. Sides efface with hairs or macrochaetae on lower half. . 12 

 Sides of face, or at least lower half, bare. .... 25 



