Xo. 64] DIPTERA OF CONNECTICUT : TAXONOMY 357 



D. {Paradicrmiota) riyu\aris O.S. (Fig. 41, K). 

 18ol>. Dicmnofa rivularis Osten Sacken : Proc. Acad. Xat. Sci. Phil- 

 adelphia, 1859:281. 



Figs.— Osten Sacken, Mon. Dipt. N. Amer., 4, pi. 2, fig. 16 (wing) ; 1869. Will- 

 iston. Man. X. Amer. Dipt., Ed. 3 : 84. fig. 25, sub 2 (wing) ; 1908. Alexander, 

 Cfls. N. Y.. 1, pi. 41, fig. 169 (ven.) ; 1919. 



(jreneral coloration <rray, the praescutum with three dark brown 

 stripes. Antennae black thronohout. AVings with a pale brown tinge, 

 stigma bnt slightly darker; Bs short, strongly angulated. Abdomen 

 brownish gray, including hypopyginm. Male hypopygium (Fig. 

 41. K) : interbase a slender flattened blade, the tip acute; inner mar- 

 gin before midlength with several setulae. $. L. 5.5-6.5 mm.; w. 

 6.5-8 mm. 9 . L. 7.5-8.5 mm. ; w. 7.5-8 mm. 



(Apr., early May) N. H., Mass., southw. to Yd. 



Subgenus Dicranota Zetterstedt. 



The tyi)ical subgenus (type, guerlni Zetterstedt) includes four 

 local species. 



Key to Species 

 (Based chiefly on male characters) 



1. Antennae ( $ ) short, if bent backwards not or scarcely reaching wing-root; 



flagellar segments short-oval 2 



Antennae { $ ) elongate, if bent backwards extending approximately to base 

 of second abdominal segment; flagellar segments long-oval, their ventral 

 face slightly produced notmani 



2. Male iiypopygium without evident interbasal processes ; phallosome subtended 



on either side bv a flattened spinous blade ; lateral angles of phallosome 



directed caudad "( Fig. 41, M) noveboracensis 



Male hypopygium with the interbasal process, a long slender, nearly straight 

 rod ; phallosome a quadrate plate, the outer lateral angles produced laterad 

 into divaricate yellow horns • 3 



3. Male hypopygium with caudal horns of phallosome appearing as short tri- 



angular yellow blades ; interbase subacute at apex (Fig. 41, J) currani 



Male hypopygium with the caudal horns of phallosome long and slender, not 

 triangular in outline; interbase obtusely rounded at apex (Fig. 41, L) 



divaricata 



Dicranota {Dicranota) currani Alex. (Fig. 41, J). 

 19'J6. Dicranota currani Alexander; Ent, News, 37:50. 



Mesonotal praescutum yelloAvish gray, with three very conspic- 

 uous dark brown stri})es, the broad median stripe entire except near 

 suture. Legs brownish black, femoral bases restrictedly paler. AVings 

 weakly tinged, the stigma pale brown. Male hypopygium (Fig. 41, J). 

 $ . L. about 5 mm. ; w. 7-7.5 mm. 



(May) Ont., Que., westw. to Minn. 



D. (Dicranota) diyaricsiia. Alex. (Fig. 41, L). 



1925. Dicranota divaricata Alexander; Ent. News, 36:203-204. 



Closely allied to currani. Median praescutal stripe more evident- 



'ly divided, to produce two intermediate brown stripes. Abdominal 



tergites light brown, the extreme caudal margins of intermediate ter- 



