304 CONNECTICUT GEOL. AND NAT, HIST. SURVEY [Bull. 



pecially in the shape of the interbase. $ . L. about 4.5-5.5 mm. : w. 

 5-6.8 mm. $ . L. 5.5-6 mm. ; w. 7-7.5 mm. 



(June) Que., Me., N. H., Vt., Mass., N. Y., westw. to Ind. and Mich., southw. to 

 Tenn. 



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



D. {Rhaphidolahis) persimilis (Alex.) (Fi^. 42, H) 



1920. Rhafhklol'Obis pershnUfs Alexander; Can. Ent.. 52:79-80. 



General coloration of thorax, incliidino: pleura, gray; praesc-utal 

 stripes distinct. Male hypopyginm (Fig. 42, H). $. L. 4-4.5 mm.; 

 w. 4.8-5.5 mm. 



(Apr.. May; Oct.) Md., Va., N. C. S. C. (Transition). 



D. {Rhaphidolahis) rogersiana (Alex.) (Fig. 42, 1). 

 1925. Rhaphidolabis {Rhaphidolahis) rogersiana Alexander; Ent. 

 Xews, 36 : 204. 



General coloration of thorax gray, the praescntum with three still 

 darker leaden -gray stripes; wings tinged with milky white, stigma 

 pale brown ; cell R-a sessile or very short-petiolate. Male hypopygium 

 (Fig. 42.1). $. L. 5.2-5.5 mm.; w. 6-6.5 mm. ?. L. 6-6.5 mm.; w. 

 7-7.5 mm. 



(June-Aufi-) Que., westw. to Micii. ( Hudsonian, liigh Canadian). 



D. (/i*A«/>///V/(9/c/6is) rubescens (Alex.) (Fig. 42, J). 

 1916. Ii/i<i phidoJabis {Rhaphidolahis) ruhescens Alexander: Proc. 

 Acad. Xat. Sci. Philadelphia, 1916:544-545. 



Figs.— Alexander, Ibid., 1916, pi. 28, fig. 58 (wing). .-Me-xander. Cfls. N. Y.. 

 1. pi. 41, fig. 172 (wing) ; 1919. 



Closely allied to cayuga. Head light silvery gray. Wings with 

 stigma very pale to indistinct. Abdomen with hypopygium (Fig. 

 42, J): interbase with teeth more unequal than in caguga. 6. L. 

 5-5.5 mm. ; av. 6-6.6 mm. 9 . L. 6-6.5 mm. ; w. 7-7.5 mm. 



(June: Aug.) N. B.. Me.. N. H., Yt., Mass., N. Y. 



D. {Rhaphidolahis) tenuipes ((). S.) (Fig.s. 40. J : 42, K). 



1869. Rhaphidolahis tenuipes Osten Sacken; Mon. Dipt. N. Amer.. 



4:287. 



Figs. — Osten Sacken, Ibid., pi. 2, fig. 17 (wing). Needham. 23rd Rept. X. Y. 

 -St. Ent. for 1907, pi. 19, fig. 2 (ven.) ; 1908. Williston.i Man. N. Amer. Dipt.. Ed. 

 3:84, fig. 25, sub 14 (ven.): 1908. Alexander, Proc. Acad. Nat. Sci. Philadelphia, 

 1916, pi. 28. fig. 56 (wing) : 1916. Alexander, Cfls. N. Y., 1, pi. 41, fig. 171 (wing) : 

 1919. 



Thorax chiefly yellowish, the prae.'^cutum almost covered by three 

 more or less confluent brown stripes. Head brown, the orbits light 

 gray. Wings (Fig. 40, J) tinged with grayish, stigma slightly darker. 

 Abdomen brown, the terminal segments darker. ]\Iale hypopygium 

 (Fig. 42, K). S. L. 6.5-7 mm.; w. 6-7 mm. 9. L. about 7 nun.; 

 w. 7-7.5 mm. 



