448 CONNECTICUT GEOL. AND NAT. HIST, SURVEY [Bllll. 



Erioptera {Gonempeda) nyctops Alex. (Figs. 50, C; 51, B). 



1916. Erioptera {Eiwpeda) nyctops Alexander; Proc. Acad. Nat. Sci. 

 Philadelphia, lOlO: 503-505. 



Figs.— Alexander, Ihid., pi. 27, fig. Ze (wing), pi. 31, fig. 98 (hvp.) ; 1916. 

 Alexander, Cfls. N. Y., 1, pi. 35, fig. 84 (wing) ; 1919. 



General coloration pale yellow throughout, only the eyes conspicu- 

 ously black. Wings (Fig. 50, C) with 8c very long. Male hypopyg- 

 ium (Fig. 51, B) with the basistyle produced far beyond the level of 

 apices of either dististyle, gradually narrowed to an acute point. 5. 

 L. 3.8-4 mm.; w. 4.3-4.5 mm. 9. L. 3.8-4 mm.; w. 4.5-4.8 mm. 



(Late May, June) Que., Me., N. H., Vt., N. Y., Ct., westw. to Mich., soutliw. to 

 N. C. and Tenn. 



Connecticut.— Hartland, June 9, 1929 (C. P. A.); Riverton, May .30. June 12, 1931 

 (C. P. A.); Tyler Lake, Mav 30, 1931 (C. P. A.) ; W. Granbv, Tune 8, 1929 

 (C.P.A.). 



Subgenus Erioptera Meig. 



Key to Species 

 (Based especially on male characters) 



1. Knobs of halteres dark brown 2 



Halteres pale throughout 4 



2. General coloration of body polished black; femora obscure yellow, the tips 



blackened; male hypopygium (Fig. 51, G) ebenin-u 



General coloration of body dull brown; legs brown or black 3 



3. General coloration of mesonotum dull brown, the humeral region of praescu- 



tum scarcely brightened; pleura uniformly gray to brownish gray; male 

 hypop3'gium with the inner dististyle a small simple structure that nar- 

 rows gradually to a point (Fig. 52, E) uliginosa 



General coloration of mesonotum brown, the lateral and humeral portions 

 of praescutum conspicuously brightened ; pleura obscure yellow, striped 

 longitudinalh' with dark brown ; male hypopygium with a conspicuous 

 spine on outer margin of outer dististyle at near midlength (Fig. 52, B) 



septemtrionis 



4. Wings with small darkened spots on crossveins and deflections ; outer 



costal field and cell R2 suffused with darker ; fore femora chiefly black- 

 ened, the coloration produced in large part by long black setae 5 



Wings unmarked ; legs pale (more darkened in villosa) 6 



5. Male hypopygium with the outer lobe of outer dististyle relatively slender ; 



basal gonapophyses appearing as long straight spines (Fig. 51, E) chrysocoma 

 Male hypopygium with the outer lobe of outer dististyle dilated ; basal 

 gonapophyses stout, at apex suddenly narrowed to an acute black spine 

 that is surrounded by a group of setae (Fig. 51, F)' chrysocomoides 



6. General coloration of body and appendages pale green (chlorophylla group) 7 

 General coloration of body and appendages yellow or brown, without green 



tinges 13 



7. Male hypopygium with the gonapophyses appearing as smooth polished horns 



(Fig. 51, C, D, I) '. S 



Male hypopygium with the gonapophyses appearing as flattened blades, the 

 outer margin more or less serrulate (Figs. 51, H; 52, C, D, H) 10 



8. Both dististyles slender, gradually narrowed to acute tips (Fig. 51, D) 



chlorophylioides 

 Outer dististyle expanded into a paddle-like blade ; inner style bearing a 

 subterminal spinous point (Fig. 51, C. I) 9 



9. Outer dististyle with the apex microscopically roughened ; inner style with , 



a small blackened spine on outer margin some distance from tip (Fig. 

 51^ C) chlorophylla 



