508 LIST OF DIPTEEA. 



£ Anteunarum articulus 3us lo multo longior. 

 § Fceminse abdomen apice spinosum. 



5. Scandon, Walk. 

 §§ Foeminae abdomen apice non spinosum. 



* Antennae non capitatae. - - 4. Laphiia, Meig. 

 ** Antennae capitatae. - - 7. Ampyx, Walk. 



ff Avista distin eta. - 8. Laphystia, Loew. 



2. Abdomen petiolatum. 



* Antennae valde elongatae. 9. Rhopalogaster, Macq. 

 ** Antennae mediocritev longae. 10. Micbotamia, Macq. 



ii. Corpus saepissime punctatum. 



•j- Alarum venula discalis et vena externo-media 3a 



plus minusve conjunctae. 11. Atomosia, Macq. 



ff Alarum venula discalis et vena externo-media 3a 



disjunctae. - - - 12. Cormansis, Walk. 



b. Antennarum articulus 3us villosus. 13, Laxenecera, Macq. 



b. Antennas capite infimo insertae. 14, Tapinocera, Macq. 



B. Oviductus elongatus. Venae cubitalis ramus amicus ramulum 



rejiciens. ----- 15. Phoneus, Macq. 



Genus 1. MEGAPODA. 



Caput mystace nullo. Epistoma bisetosum. Proboscis por- 

 recta. Antennae triarticulatae, non stylatae; articulus 3us obtusus. 

 Pedes longi ; onychia conspicua. Alae areola mediastinali clausa. 



Laphria, p., Fabr. ; Wied. 



Dasypogou, p., Pert;/. 



Megapoda, Macq. Hist. Nat. Dipt. i. 288. 



Wings long, narrow. Fore fork of the cubital vein undulating ; 

 hind fork and first externo-medial slightly curved hindward, 

 parallel to each other; second externo-medial nearly straight; third 

 forming a very oblique angle with the prabrachial, joining the 

 fourth at some distance from the border. Subanal united to the 

 anal very near the border. 



Mexico. 



1. Megapoda cyaneiventris. 



Foem. Nigra; antenna testacea ; abdomen cyaneum; pedes 

 fusci, tarsis posticis ci-assis hirtis ; ala subfuscce. 



Megapoda cyaneiventris, Macq. Dipt. Exot. Suppl. i. 71, 3, pi. 7, 

 f. 12. 



Mexico. 



