No. 64] DIPTERA OF CONNECTICUT : TAXONOMY 359 



Dicranota (A/nalopimi) flaveola (O. S.) (Fi^^s. 40. G; 42. A). 

 18C9. Rhaphidolabis flaveola Osten Sacken; Alon. Dipt. X. Amer., 



4 : 288. 



Figs.— Needham, 23rd Rept. N. Y. St. Ent. for 1907. pi. 25, fig. 3 (ven.) ; 

 1908 (as Amalopis, sp. ?). Alexander, Proc. Acad. Nat. Sci. Philadelphia. 1916. pi. 

 28, fig. 54 (wing) ; 1916. Alexander, Cfls. N. Y., 1, pi. 41, fig. 170 (ven.) : 1919. 



General coloration pale yellow to whitisli yellow, unmarked. 

 Halteres and legs pale yellow. Wings (Fig. 40, G) pale yellow, iri- 

 de.scent, the veins brown, distinct. Abdomen yellow, the terminal 

 segments weakly darkened. Male hypopygium (Fig. 42, A). $. L. 

 5-5.5 mm. ; w. 5-7 mm. ? . L. 6-7 mm. ; w. 6.5-8 nun. 



(Late May, Sept.) Ont., Que., Me., N. H., Vt., Mass., N. Y.. westw. to Mich., 

 southw. to Md. and N. C. 



Connecticut.— Cornwall Bridge, Aug. 19, 1931 (C. P. A.): Hartland. June 8-9, 1929 

 (C. P. A.), Kent Falls, May 31, 1931, June 12-13, 1931, Aug. 19, 1931 (C. P. A.); 

 Norfolk, Tune 9, 1929. July 24, 1931, Sept. 11, 1928 (C. P. A.) ; Salisbury, Sept. 5- 

 12, 1928 (G. CC); Saptree Run State Park, June 14, 1933 (C. P. A.); W. Granby, 

 Sept. 11, 1928 (C. P. A.). 



Subgenus Plectromyia (J.sten Sacken 



1865. Astrolahis Osten Sacken; Proc. Ent. Soc. Philadelphia. 4:225 



(nom. nud.). 

 1869. Plectromyia Osten Sacken; Mon. Dipt. N. Amer., 4 : 282-284. 



Plectromyia is obviously nothing but a weak olt'-shoot of Rhaph- 

 idolahls. Antennae short in both sexes. The local species are chiefly 

 northern in distribution. The adults are mo.st freijuently found along 

 small mountain streams, while the early stages are (juite unknown. 



Key to Species 

 (Based chiefly on male characters) 



1. Antennae 15-segmented ; cell R3 long-petiolate, R^^m exceeding m-ciy. male 



hypopygium with the median region of tergite produced into a Y-shaped 



structure that is densely set with stout setae (Fig. 42, D) petiolata 



Antennae 13-segmented ; cell R3 sessile to short-petiolate, Ri^a^t. when present, 

 shorter than m-cu; male hypopygium with the median region of tergite ^ 

 broadly and obtusely rounded • 



2. Male hypopygium with the lateral tergal arms split at apex into two e<|ual 



or nearly equal acute teeth; interbase with two short apical teeth, nearly 



equal in length but one more slender and obtuse (Fig. 42. B) confusa 



Male hypopygium with the lateral tergal arms broad, one apical lobe broadly 

 rounded: interbase with the axial spine very elongate, the lateral spine 



n/T^' A1 r" \ modesta 



(rig. 42, C) 



Dicranota (/^Z^cf/'omv/m) confusa (Alex.) (Fig. 42, B). 

 1924. RhaphklolaUs {Plectromyia) confvsa Alexander; Bull. Brook- 

 lyn Ent. Soc, 19 : 63. 

 Almost as in modesta, differing most evidently in details of the 

 male hypopygium (Fig. 42. B). L L. 4-4.5 mm.; w. 4.8-a.6 mm. 

 9 . L. "about 5 mm. ; w. 5.5-6 mm. 



(May, June) Que., N. B., Vt., Mass. and N. Y., southw. to N. C. and S. C. (Low 

 Canadian). 

 Connecticut.— Hartland. June 9. 1929 (C. P.A.). 



