252 MAINE AGRICUIvTURAI, EXPERIMENT STATION. I9II. 



Table of Genera. 



a. Proboscis much longer than the head. 



b. Media and cubitus unbroken ; media forks a very short distance 

 beyond the crossvein; palpi situated near apex of proboscis. 

 (Figs. 169, 170). I. Gnoriste* 



bb. Bases of media and cubitus defective. (West Indies). 



2. Probolaiis. 

 aa. Proboscis not elongate. 



b. Cubitus not forked or at most its anterior branch but faintly indi- 

 cated, 

 c. Lateral ocelli widely remote from eye margin ; costa extends 

 beyond the tip of Rs. 

 d. Subcosta extends at least to base of Rs ; media 2-branched. 

 (Fig. 171). 3. Acnemia. 



dd. Subcosta short ; media simple. 4. Asana. 



cc. Lateral ocelli nearly or quite contiguous to eye margin. 



d. Cell Ri very narrow; Rs strongly arched. 32. Sceptonia. 

 dd. Cell Ri not unusually narrow ; Rs nearly straight. 



33. Zygomyia. 

 bb. Cubitus with 2 branches, anterior branch may be detached at base, 

 c. Anterior branches of both media and cubitus detached at base. 

 (Fig. 173). (Leia Winnertz). 5. Rondaniella.'t 



cc. Both media and cubitus forked, but immediate base of the 

 anterior branch of one of them may be obliterated. 

 d. Subcostal vein ends in the costa and is at least half as long 

 as the basal cell R. 

 e. Basal section of anterior branch of media wanting. 



f. Subcostal crossvein (Sca) present though faint, costa 



slightly produced beyond tip of Rs. (Fig. 174). 



(^Anaclinia). 6. Neuratelia. 



ff. Subcostal crossvein (SC2) absent, costa not produced 



beyond tip of Rs. 7. Odontopoda. 



ee. Basal section of anterior branch of media present. 



f. Subcostal crossvein (SC2) present. 



g. Cubitus forks under or proximad of fork of media, 

 h. Subcostal vein enters the costa beyond, at, or little 

 before the base of the radial sector. 

 i. Fore metatarsus distinctly longer than its tibia ; 

 petiole of the media about i as long as the 

 anterior ■ branch ; costa scarcely produced be- 

 yond tip of Rs. (Fig. 177). 8. Lcptomorphus. 

 ii. Fore metatarsus shorter than its tibia. 



j. Subcostal vein prolonged far beyond the base 

 of the radial sector; anal vein stout; petiole 

 of media about i as long as the anterior 

 branch. (Fig. 178). 9. Allocotocera. 



* Eugnoriste is a Sciarid. 



t In Manota, which is a Sciarid, the petiole of the media is wanting. 



