EPHYDRA. 263 



Dull-aeneous. Face whitish. Wings hyaline. Tarsi yellow. 

 Common among aquatic plants. (E. I.) 



Subgenus 5. 



NAP^A, Desv. E. M. 800 (1830); Hal. Ephydra p., Fal. ; Meig. ; 



Mcq. ; Zett. 

 Corpus pedesque subglabra. Caput depressum. Fades proclivis, latissima, 



vix nisi nuda. Clypeus exsertus. Mentum valde incrassatum. Arista 



basi pubescens. Vena prcebracJdaUs recurrens fere in al(B media. Ab- 



domen depressum, suborbiculatum. 



Body and legs almost smooth. Head depressed. Face inclined, very 

 broad, almost bare. Clypeus exserted. Mentum very thick. Arista pu- 

 bescent at the base. Prcebrachial recurrent vein almost in the middle of 

 the wing. Abdomen depressed, nearly orbiculate. 



The species will form two groups : 

 a. Recurrent vein with a branch at the tip. Species 12, 13. 

 a a. Recurrent vein simple. Species 14-17. 



12. coarctata, Fal. Act. Holm. 247. 4. 4 (1813); Meig.; Hal.; 

 Zett. rujitarsis, Mcq. stagnicola major, Desv. Fusco-anea, arista 

 nisi basi nuda, alis fuscanis, venis transversis obscuris, tarsis basi ferru- 

 gineis. Long. 1| ; alar. 3 lin. 



Brownish-ceneous. "Arista bare, except at the base. Wings brownish, 

 with darker transverse veins. Tarsi ferruginous at the base. 

 Abundant on pools. (E. I.) 



13. littoralis, Meig. Zw. vi. 116. 6. pi. 60. f. 8 (1830); Mcq.; 

 Hal. ; Zett. Obscure amea, arista villosa, alis fuscanis, venis transversis 

 obscuris utrinque hyalino-guttatis, tarsis basi ferrugineis. Long. 1 ; 

 alar. 3 lin. 



Dull-ceneous. Arista villose. Wings brownish; transverse veins 

 darker, with hyaline dots along each side. Tarsi ferruginous at the base. 



Less common than E. coarctata. (E. I.) E. quadripunctata, 

 Meig., also belongs to this group. 



14. Aquila, Fal. Act. Holm. 1813. 247. 4. 3 (1813); Meig.; 

 Mcq. ; Hal. ; Zett. Fusco-aenea, alis fuscanis, venis transversis obscuris, 

 tibiis basi apiceque albis, tarsis ferrugineis. Long. 1^; alar. 3 lin. 



Brownish-esneous. Wings brownish, with darker transverse veins. 

 Tibia white at the base and at the tips. Tarsi ferruginous. 

 Not rare. (E. I.) 



15. fossarum, Hal.E.M. 1. 175 (1834). stagnicola minor? Desv. 

 Fusco-anea, alis fuscanis, venis transversis obscuris, tarsis basi ferrugineis. 

 Long. | ; alar, li lin. 



