in the Collection of W. W, Saunders, Esq. 191 



it to its prey. The aperture on the inner side of this joint is very 

 distinct in the Echtnomyi^e, and probably may be discovered in all 

 the species. The Echinomyice are the nriost highly developed 

 group in the sub-family, the second joint of the antennae having 

 in them its greatest length, and the third joint its greatest deve- 

 lopment. The following synopsis includes most of the genera of 

 Tachina, which is one of the seven groups into which this family 

 is divided in Ins. Brit. Dipt. vol. 2 : — 



* Aristae articulus 2"' longus. 



f Antennarum articulus 2"* 3° non brevior. 



\ Palpi thorace non breviores. Dejeania, Desv. 



J J Palpi non longissimi. Echinomyia, Dumeril. 



"I- f Antennarum articulus 2"* 0° brevior. 



;}; Arista recta. 



§ Palpi mediocres. 



X Antennarum articulus 3"* convexus. Jurmia, Desv. 



X X Antennarum articulus 3"' linearis. Hystncia, Macq. 



§ § Palpi breves, graciles. 



X Facies non inclinata, nee nuda. Micropalpus, Macq. 



X X Facies inclinata, nuda. Aprotheca, Macq. 



\X Arista flexa. 



§ Facies non inclinata. 



X Epistoma non prominens, 



—5- Palpi non extantes. Thryptocera, Desv. 



— i — 5- Palpi extantes. Exopalpus, Macq. 



X X Epistoma prominens, Gonystylum, Macq. 



§ § Facies inclinata. Illigeria, Meig. 



X X Aristae articulus 2"' brevis. ^ 



■\ Caput setis duabus longis erectis. Heplacephala, Macq. 



-j--|- Caput setis nullis longis erectis. 



;^ Corpus latum. 



§ Antennae brevis. Trixa, Meig. 



§ § Antennae plus minusve longae. 



X Abdomen brevissimum. TrichojjJiora, Macq. 

 X X Abdomen non brevissimum. 



—5- Palpi setis longis. Lasiopalpus, Macq. 



— i — h Palpi setis nullis longis. 



X Antennarum articulus 3"^ 2° non longior. Hystricephala, 

 Macq. 



X X Antennarum articulus 3"* 2° vix duplo longior. 



— {- Oiuli pubescentes. Nemorcea, Macq. 



— i- H- Oculi nudi. 



