No. 64] DIPTERA OF COXNECTTGUT : TAXONOMY 449 



Outer dististyle a dusky paddle-like blade, with smooth margins; inner 

 style short and stout, with a small recurved spinous point at extreme tip 

 (Fig. 51, I) gaspeana 



10. Inner dististyle with a long spinous point placed far before apex, to give 



a forked appearance to style (Figs. 51, H ; 52. D) .' 11 



Inner dististyle not appearing forked at apex (Fig. 52, C. H) 12 



11. Outer dististyle narrow, the extreme tip truncated and blackened; gona- 



pophyses slender (Fig. 51, H) furcifer 



Outer dististyle widened apically; gonapophyses heavily blackened, unusually 

 broad, terminating in a spike-like point (Fig. 52, D) subfurcifer 



12. Inner dististyle with a setiferous spine at right angles to extreme aju-x 



(Fig. 52, C) subchlorophylla 



Inner dististyle without evident spine, the style appearing more or less 

 foot-shaped, with a group of setae at the "heel." (Fig. 52, H) viridula 



13. General coloration of body dark brown; wings strongly tinged with brown; 



male hypopygium (Fig. 52, G) villosa 



General coloration of body light brown to pale yellow; wings yellow or 

 only slightly infumed 14 



14. Mesonotal praescutum with distinct reddish brown stripes; posterior sclerites 



of mesonotum and pleura pale yellow, variegated with brown or reddish 



brown ; male hypopygium (Fig. 52, F) .vespertina 



Mesonotum and pleura uniformly pale yellow or orange 15 



15. General coloration orange or orange-yellow; front and restricted posterior 



orbits silvery; male hypopygium (Fig. 52, A) with the outer dististyle an 

 elongate paddle-like blade ; gonapophyses appearing as long, straight, 

 black spikes, King generally parallel to one another, jutting caudad from 



the genital chamber megophthalma 



General coloration pale yellow or whitish yellow; male hypopygiurn with 

 both dististyles long and slender, subequal in length and size, their tips 

 acute; gonapophyses short, bent at about a right angle into a long bl;ick- 

 ened spine that is not directed caudad straminea 



The use of male genitalic characters is quite imperative in the case 

 of many of the above species, notably those of the so-called cliloro- 

 phylla group. 



Erioptera {Erioptera) chlorophylla O. S. (Fig. 51, C). 

 1859. Enoptera chlorophylla Osten Sacken; Proc. Acad. Nat. Sci. 

 Philadelphia, 1859:226. 



Figs.— Osten Sacken, Mon. Dipt. N. Amer., 4, pi. 1, fig. 16 (wing) ; 1869. Alex- 

 ander. Cfls. N. Y., 1, pi. 35. fig. 75 (wing) ; 1919. Dickinson. Cfls. Wise. p. 192, 

 f^g. 75 (wing) ; 1932. 



Type of the chlorophi/Ua group. General coloration pale green. 

 Eyes {$) holoptic beneath, separated above. Ovipositor with long 

 smooth cerci. Male hypopygium (Fig. 51, C). $■ L. 4-4.5 mm.; w. 

 5-5.5 mm. ? . L. 5-5.5 mm. ; w. about 6 mm. 



(July, Aug.) Ont., Que., N. S., Me., N. H.., N. Y., westw. to Ind. and Wise. 

 southw. to N. C., Tenn. and Fla. 



Connecticut.-East River, July 9, 1910 (Ely); Hamden, July 12, 1932 (P.G^), July 

 31. 1928 (R. B.F.); Manitic Lake, Aug. 6, 1929 (C.P.A.): New Haven, Aug. 20. 

 1928 (G. B.). 



E. (Erioptera) chlorophylloides Alex. (Fig. 51.p). 

 1919 Erioptera cMorophyJloides Alexander; Bull. Brooklyn l^>nt. 

 Soc, 14:106-107. 

 Belon^Ts to the chlorophylla. group. General coloration pale green. 



