EPHYDRA. 203 



Dull-fcncous. Face wliitish. Wings hyaliiif. Tarsi yellow. 

 Common among aquatic plants. (E. I.) 



Subgenus 5. Nap^ea. 



Nap^a, Desv. E. M. 800 (1830); Hal. Ephjdra p., Fal. ; :Mcig. ; 

 Mcq. ; Zett. 



Corpus pedesque mhjlabra. Caput depressmn. Fac'w.s procUvis, Icdissima, 

 vix nisi nuda. Clypetis exsertns. 3feni?mi valde incrassatmn. Arista 

 hasi pid)escens. Vena jiroihrachicdis recurrens fere in alee medio. Ab- 

 domen depressmn, siihorbiculatum. 

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



hroad, almost hare. Chjpeiis exserted. Mentum very tJdcJc. Arista pu- 



bescent at the fjase. Prfebrachial recurrent vein almost in the middle of 



the wing. Abdomen depressed, nearly orbiculate. 

 The species will form two groups : — 



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



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



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

 Zett. — ruft arsis, Mcq. — staynicola major, Desv. Fusco-anea, arista 

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

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



Brownish-aneous. Arista bare, except at the base. Wings hro%onish, 

 tcith 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 cenea, arista villoss, alis fuscanis, venis transversis 

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

 alar. 3 lin. 



Bull-mieous. Arista villose. Wiiigs brownish ; transverse veins 

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



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

 Meig., also belongs to this group. 



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

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

 iibiis basi apiceqne albis, tarsis f err ugineis. Long. 1|; alar. 3 lin. 



B7'otvnish-(eneous . 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.]\I. I. 175 (1834). — stagnicola minor? Desv. 

 Ftisco-ccnea, alis fuscanis, venis transversis obscuris, tarsis basiferrugineis. 

 Long, f; alar. 11 lin. 



