NO. 2344. SUPERFAMILY TIPULOIDEA— ALEXANDER AND McATEE. 417 

 Genus CLADURA Osten Sacken. 



* CLADURA FLAVOFERRUGINEA Osten Sacken. 



Abundant; collected from October 6 to November 17; is attracted 

 to light. P. I. 



Genus ERIOPTERA Meigen. 



KEY TO SPECIES. 



1. Cell first M2 open by the atrophy of the outer deflection of Mj (subgenus 



Mesocyphona Osten Sacken ) 2. 



Cell first M2 usually closed ; if open it is by the atropy of m 4. 



2. Wings pale gray with small brown dots at the tips of the veins alo-ng the 



wing margin E. (M.) parva (p. 419). 



Wings grayish or brown, with whitish dots or spots 3. 



3. Wings with abundant white dots in all the cells; each femur with two 



brown rings E. {M.) caloptera (p. 418). 



Wings with about 20 large white spots that are confined to the region of 



the veins; each femur with a single brown ring before the tip 



E. (M.) needhami (p. 419). 



4. Cell first M2 open by the atrophy of m; second anal vein arcuated, before 



its tip bent suddenly toward the first, so that cell first A, at its middle 

 is about as broad or broader than at the margin (subgenus Erioptera 



Meigen) 5. 



Cell first Ml usually closed; anal veins divergent 12. 



5. Knobs of the hulteres dark brown E. (E.) septemtrionis (p. 419). 



Knobs of the halteres pale 6. 



6. Wings yellowish, some of the cross veins and deflections of veins with tiny 



brown dots E. (E.) chrysocoma (p. 418). 



Wings yellowish or green, unmarked 7. 



7. Thorax reddish, the humeral region of the mesonotum yellowish 



E. (E.) vespertina (p. 419). 

 Thorax yellow or light green 8. 



8. Color of the body and wings light yellow E. (£?.) straminea (p. 419). 



Color of the body and wings light green 9. 



9. Male hypopygium with the two pleural appendages simple ; eyes of the male 



very large ; female ovipositor with the ventral margin of the tergal valves 



finely serrate. (Regional) E. (E.) chl or ophylloides Alexander. 



Male hypopygium with the ventral pleural appendage with a spine before 

 the tip ; female ovipostor longer, almost straight and the ventral margins 

 of the tergal valves smooth 10. 



10. Spine on the ventral pleural appendage very long so the appendage appears 



almost evenly forked at its tip E. (E.) furcifer (p. 418). 



Spine on the ventral pleural appendage smaller 11, 



11. Spine on the ventral pleural appendage located at the tip of the appendage ; 



gonapophyses shaped like flattened paddles with the outer margin mi- 

 nutely serrated. (Regional) E. (E.) subchlorophylla Alexander. 



Spine on the ventral pleural appendage small, located before the tip of the 

 appendage; gonapophyses ending in a laterally directed chitinized horn. 



(Regional) E. {E.) chlorophylla Osten Sacken. 



181404— 21— Proc.N.M.vol.58 27 



